Spectrum analyzer and frequency mark position setting method thereof

Abstract

The present invention provides a spectrum analyzer and a frequency mark position setting method thereof, in which the position setting of a frequency mark can be effectively implemented with a small amount of effort without the need to open another screen or operate a physical encoder in the display of a spectrum display screen. A spectrum analyzer (1) is configured to have: a spectrum display control unit (31) that displays, on a spectrum display screen, a graph indicating spectrum characteristics, a frequency mark, and a level mark; an input-enabled state display control unit (32) that displays the frequency instruction frame in an input-enabled state in accordance with an operation of selecting a frequency flag from the keyboard (20a); and a mark position setting display control unit (34) that receives an input of a desired frequency to the frequency indication frame in the input-enabled state, changes the position of the frequency mark on the horizontal axis (frequency axis) to the position of the input frequency, updates the value of the frequency indicated by the frequency indication frame to the value of the input frequency, and displays the updated value.

Description

Technical Field

[0001] The present invention relates to a spectrum analyzer which analyzes a measured signal and displays a waveform of a spectrum characteristic together with a frequency mark according to the analysis result and a method for setting a frequency mark position thereof. Background Art

[0002] As is well known, a spectrum analyzer extracts frequency components of a preset frequency band from a measured signal (input signal), analyzes the spectrum characteristics, and displays the waveform of the spectrum characteristics on a display unit based on the analysis result.

[0003] Regarding the display control of the spectrum characteristics in the spectrum analyzer, for example, there is a method known for displaying a waveform (graph) showing the relationship between the frequency and the signal level of the measured signal on a two-dimensional plane having a scale of frequency on the horizontal axis and a scale of signal strength (hereinafter referred to as signal level) on the vertical axis (for example, Patent Document 1, etc.). The user can select the waveform (see Patent Document 1, etc.) from the displayed graph (see Patent Document 1, etc.). Figure 8 ) focuses on the desired frequency band (segment) while grasping the signal level of the frequencies within the segment.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2011-80927

[0005] In a spectrum analyzer that displays spectrum characteristics in a graph, an operation of switching a segment of interest on the graph and confirming in detail the relationship between the frequency and the signal level in a desired segment may be repeatedly performed.

[0006] The display example of the spectrum characteristics in such a conventional spectrum analyzer is shown in Fig.12 Reference Fig.12 The following describes a procedure for confirming spectrum characteristics in a conventional spectrum analyzer.

[0007] In conventional spectrum analyzers, the analysis results of the spectrum characteristics of the measured signal are displayed, for example, Fig.12 The spectrum display screen 70 shown in the figure displays a graph 80 of spectrum characteristics in a graph display area 71. The spectrum display screen 70 also displays a setting status display area 72 that displays setting status of the center frequency and frequency span, etc., related to the analysis of spectrum characteristics, and a function menu area 73 that displays function menus related to various settings, etc.

[0008] In the display of the spectrum display screen 70, the user can associate with the graph 80 and set the dotted line area represented by the symbols 81 and 82 as a segment mark, so that the segment can be narrowed to confirm the relationship between the frequency and the signal level. The position of the segment mark or the segment width can be changed, and the processing involved in the change is performed, for example, by the following steps.

[0009] Here, the case where Marker1 is set (changed) to a zone center frequency of 5.9875 GHz and a zone width (ZoneWidth) of 1 MHz is described. In the following description, physical keys (including the F1 key (GHz) and the F2 key (MHz)) are keys on a keyboard, for example. Also, it is assumed that Fig.12 The Marker main function menu displayed in the function menu area 73 consists of 2 pages. Fig.12 The page is page 1.

[0010] In this case, the user presses the Marker key (physical key). Then, the user presses the F1 key (Active Marker) in the function menu area 73, and then presses the F1 key (Marker1) to set the active marker to 1. Next, the second page (not shown) of the Marker main function menu is displayed, and after selecting the segment center frequency item, 5.9875 is typed with the physical key (numeric key), and then the F1 key (GHz) is pressed. Thus, the segment center frequency "5.9875 GHz" is set.

[0011] Next, the first page of the Marker main function menu is displayed (refer to Fig.12 ) and press F6 (Zone Width). If you press "1" with the physical key and then press the F2 key (MHz), the zone width is set to "1MHz".

[0012] Thus, in order to set (or change) the position of the segment mark (horizontal axis mark) in the conventional spectrum analyzer, for example, it is necessary to open multiple function menus (other screens) required for the setting and changing operation in multiple levels in the function menu area 73 of the spectrum display screen 70, and to open each menu and input the setting value for each item, etc. This is a cumbersome operation. In order to input the setting value in the item, for example, it is sometimes necessary to operate a physical encoder.

[0013] As described above, in conventional spectrum analyzers, when setting the position of horizontal axis marks (frequency marks) such as segment marks, several other screens need to be opened on the spectrum display screen 70 as needed, and further operations on physical encoders are required, so that the user's workload involved in setting the position of the frequency mark is extremely heavy. Summary of the invention

[0014] The present invention is completed to solve this kind of previous problem, and its purpose is to provide a spectrum analyzer and a frequency marker position setting method thereof, which can effectively implement the frequency marker position setting with less workload in the display of the spectrum display screen without opening other screens, operating physical encoders, etc.

[0015] In order to solve the above-mentioned problems, the spectrum analyzer according to the first aspect of the present invention is characterized in that it has a spectrum display control means 31, which displays a spectrum display screen 50 having a graph area 52 defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph 60 indicating the spectrum characteristics of the measured signal analyzed by the signal analysis means 15, a frequency mark 61 having a frequency indication frame 61a indicating the value of the frequency on the horizontal axis corresponding to a point on the graph, and a level mark 62 having a level indication frame 62a indicating the value of the signal level on the vertical axis corresponding to the point in the graph, in the graph area, and has an input-enabled state display control means 32, which displays the frequency indicator in a manner indicating an input-enabled state in which a desired frequency can be input, in response to an operation of selecting the frequency indicator by the input means 20a, during display of the spectrum display screen. an operable state display control mechanism 32A, which displays the chart area in a manner indicating an operable state in which the movement operation of the frequency mark along the horizontal axis can be accepted according to the operation of selecting the chart through the input mechanism 20a in the display of the spectrum display screen; and a frequency mark position setting display control mechanism 34, 34A, which accepts the input of the desired frequency to the frequency indication frame through the input mechanism when in the input possible state, changes the position of the frequency mark on the horizontal axis to the position of the input frequency, updates the value of the frequency indicated by the frequency indication frame to the value of the input frequency and displays it, accepts the movement operation of the frequency mark through the input mechanism when in the operable state, changes the position of the frequency mark to the position of the frequency corresponding to the movement operation, updates the value of the frequency indicated by the frequency indication frame to the value of the frequency at the changed position and displays it.

[0016] According to this structure, the spectrum analyzer involved in Scheme 1 of the present invention is able to use a frequency mark that is displayed on the spectrum display screen in association with a graph and indicates the position of a frequency corresponding to a point on the graph as a tool for inputting the value of the frequency requested to be changed, and in the display of the spectrum display screen, the position of the frequency mark can be simply changed to the position of the desired frequency by a simple operation of inputting the desired frequency in the frequency indication box of the frequency mark.

[0017] Furthermore, a frequency marker which is displayed on the spectrum display screen in association with a graph and which indicates the position of a frequency corresponding to a point on the graph can be used as a tool for moving it to the position of a frequency requested to be changed, and in the display on the spectrum display screen, the position of the frequency marker can be easily changed to the position of a desired frequency by a simple operation of moving the position of the frequency marker to the position of the desired frequency.

[0018] Therefore, when setting the position of the frequency mark, there is no need to open other screens, operate physical encoders, and other tedious tasks, thereby greatly reducing the workload involved in setting the position of the frequency mark.

[0019] Furthermore, in the spectrum analyzer involved in Scheme 2 of the present invention, it can be set as the following structure: the frequency mark position setting display control mechanism changes the position of the level mark on the vertical axis to the position of the signal level corresponding to the updated frequency in response to the change in the position of the frequency mark, and updates the value of the signal level indicated by the level indication box to a value corresponding to the changed position of the signal level and displays it.

[0020] According to this structure, when the spectrum analyzer involved in Scheme 2 of the present invention sets the position of the frequency mark, it can also simultaneously and easily set the position setting of the level mark corresponding to the position of the set frequency mark, thereby reducing the burden of confirmation work when it is necessary to repeatedly confirm the relationship between the frequency and the signal level for any desired frequency.

[0021] Furthermore, in the spectrum analyzer involved in Scheme 3 of the present invention, it can be set as follows: the frequency mark position setting display control mechanism will also display a frequency indication line 61b extending from the frequency position indicated by the frequency indication frame in parallel with the vertical axis and a level indication line 62b extending from the signal level position indicated by the level indication frame along the horizontal axis in the chart area.

[0022] According to this configuration, the spectrum analyzer according to the third aspect of the present invention can easily confirm the waveform near the intersection of the frequency indicator line and the level indicator line on the spectrum characteristic graph as a reference even after the positions of the frequency marker and the level marker are set.

[0023] Furthermore, in the spectrum analyzer involved in Scheme 4 of the present invention, the structure can be set as follows: the signal analysis mechanism analyzes the spectral characteristics of multiple RF signals in different frequency ranges of the millimeter wave band as the measured signal, and the spectrum display control mechanism displays the graph representing the spectral characteristics of the RF signal selected from the multiple RF signals.

[0024] According to this structure, the spectrum analyzer involved in Scheme 4 of the present invention can also set the position of the frequency mark and the level mark for any of the multiple RF signals in each frequency range of the millimeter wave band through simple operations, without having to select one RF signal from them, open other screens, etc.

[0025] Furthermore, in order to solve the above-mentioned problems, the method for setting the frequency marker position of the spectrum analyzer according to the fifth aspect of the present invention is characterized in that the spectrum display control means 31 displays a spectrum display screen 50 having a graph area 52 defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph 60 representing the spectrum characteristics of the measured signal analyzed by the signal analysis means 15, a frequency marker 61 having a frequency indication frame 61a indicating a value of the frequency on the horizontal axis corresponding to a point on the graph, and a level marker 62 having a level indication frame 62a indicating a value of the signal level on the vertical axis corresponding to the point in the graph, in the graph area; The method for setting the frequency mark position of the analyzer includes: an input-enabled state display control step S12, in which, in the display of the spectrum display screen, the frequency indication frame is displayed in a manner indicating an input-enabled state in which a desired frequency can be input according to an operation of selecting the frequency mark through the input mechanism 20a; an input acceptance step S13, in which the input of the desired frequency to the frequency indication frame through the input mechanism when the frequency mark is in the input-enabled state; and a frequency mark position setting display control step S14, in which the position of the frequency mark on the horizontal axis is changed to the position of the input frequency, and the value of the frequency indicated by the frequency indication frame is updated to the value of the input frequency and displayed.

[0026] According to this structure, the method for setting the frequency marker position of the spectrum analyzer involved in the fifth solution of the present invention can use the frequency marker that is displayed on the spectrum display screen in association with the graph and indicates the position of the frequency corresponding to a point on the graph as a tool for inputting the value of the frequency requested to be changed, and in the display of the spectrum display screen, by a simple operation of inputting the desired frequency in the frequency indication box of the frequency marker (step S13), the position of the frequency marker is simply changed to the position of the desired frequency (step S14). As a result, when setting the position of the frequency marker, there is no need to open other screens, operate the physical encoder, or other cumbersome work, thereby greatly reducing the workload involved in setting the position of the frequency marker.

[0027] Furthermore, in order to solve the above-mentioned problem, a method for setting a frequency marker position of a spectrum analyzer according to a sixth aspect of the present invention is characterized in that the spectrum analyzer includes a spectrum display control unit 31, the spectrum display control unit 31 displays a spectrum display screen 50A having a graph area 52 defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph 60 representing a spectrum characteristic of a measured signal analyzed by a signal analysis unit 15, a frequency marker 61 having a frequency indication frame 61a indicating a value of a frequency on the horizontal axis corresponding to a point on the graph, and a level marker 62 having a level indication frame 62a indicating a value of a signal level on the vertical axis corresponding to the point on the graph, on the graph area. The frequency marker position setting method of the spectrum analyzer comprises: an operable state display control step S12A, in which, in the display of the spectrum display screen, the chart area is displayed in a manner indicating an operable state capable of accepting a movement operation of the frequency marker along the horizontal axis according to an operation of selecting the chart through the input mechanism 20a; an operation acceptance step S13A, in which an operation of moving the frequency marker through the input mechanism is accepted when the frequency marker is in the operable state; and a frequency marker position setting display control step S14A, in which the position of the frequency marker is changed to a position of a frequency corresponding to the movement operation, and the value of the frequency indicated by the frequency indication box is updated to the value of the frequency of the position after the change and displayed.

[0028] Furthermore, in order to solve the above-mentioned problems, the frequency mark position setting method of the spectrum analyzer involved in Scheme 7 of the present invention is characterized in that it also includes: step S15, corresponding to the change of the frequency mark position, the position of the level mark on the vertical axis is changed to the position of the signal level corresponding to the updated frequency, and the value of the signal level indicated by the level indicator box is updated to a value corresponding to the changed position of the signal level and displayed.

[0029] Furthermore, in order to solve the above-mentioned problems, the frequency mark position setting method of the spectrum analyzer involved in Scheme 8 of the present invention is characterized in that it also includes: step S15A, corresponding to the change of the frequency mark position, the position of the level mark on the vertical axis is changed to the position of the signal level corresponding to the updated frequency, and the value of the signal level indicated by the level indicator box is updated to a value corresponding to the changed position of the signal level and displayed.

[0030] According to this structure, the method for setting the frequency marker position of the spectrum analyzer involved in the sixth solution of the present invention can use the frequency marker that is displayed on the spectrum display screen in association with the graph and indicates the position of the frequency corresponding to a point on the graph as a tool that can move it to the position of the frequency requested to be changed, and in the display of the spectrum display screen, by a simple operation of moving the position of the frequency marker to the position of the desired frequency (S13A), the position of the frequency marker can be simply changed to the position of the desired frequency (S14A). As a result, when setting the position of the frequency marker, there is no need to open other screens, operate the physical encoder, or other cumbersome work, thereby greatly reducing the workload involved in setting the position of the frequency marker.

[0031] Effects of the Invention

[0032] The present invention can provide a spectrum analyzer and a frequency marker position setting method thereof, which can effectively implement the frequency marker position setting with less workload without opening other screens, operating physical encoders, etc. in the display of the spectrum display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a block diagram showing the structure of a spectrum analyzer according to one embodiment of the present invention.

[0034] Figure 2 This is a block diagram showing a functional configuration of a display control unit in a spectrum analyzer according to an embodiment of the present invention.

[0035] Figure 3 The present invention is a transition diagram of a spectrum display screen based on the display control of the display control unit of the spectrum analyzer according to one embodiment of the present invention. (a) shows an example of the display of the initial screen of the spectrum display screen, and (b) shows an example of the display after the position is set based on the marker position setting display control.

[0036] Figure 4 This is a flowchart showing a spectrum measurement operation of the spectrum analyzer according to one embodiment of the present invention.

[0037] Figure 5 The display control unit of the spectrum analyzer according to one embodiment of the present invention is shown in FIG. Figure 4 This is a flowchart of detailed operations of the spectrum characteristic display processing of step S8.

[0038] Figure 6 It is a diagram showing a detailed configuration and a display example of a spectrum display screen based on display control in a display control unit of a spectrum analyzer according to an embodiment of the present invention.

[0039] Figure 7 It means according to Figure 6 The display content shown is a diagram showing an example of a display on a spectrum display screen when the marker position is set by the display control unit according to the marker position setting display control.

[0040] Figure 8 This is a block diagram showing a functional configuration of a display control unit in a spectrum analyzer according to a modified example of the present invention.

[0041] Fig. 9 This is a diagram showing a detailed display example of a spectrum display screen when a frame display of a graph region in a display in a spectrum analyzer according to a modification of the present invention is in an operable state.

[0042] Fig.10 Indicates from Fig. 9 The operable state shown is an example of a display on the spectrum display screen when a frequency marker movement operation is received and marker position setting control is performed.

[0043] Fig.11 The present invention is based on a display control unit of a spectrum analyzer according to a modified example of the present invention. Figure 4 This is a flowchart of detailed operations of the spectrum characteristic display processing of step S8.

[0044] Fig.12 This is a diagram showing a display example of a spectrum display screen related to segment mark setting processing of a conventional spectrum analyzer. DETAILED DESCRIPTION

[0045] Hereinafter, a spectrum analyzer and a method for setting a frequency marker position thereof according to the present invention will be described.

[0046] In view of the development of 5G or higher-level communication technologies, the spectrum analyzer involved in the present invention can be applied, for example, to measuring the functions of communication terminals that can perform high-speed communications in the millimeter wave (200 GHz to 300 GHz, etc.) band.

[0047] The spectrum analyzer according to the present invention has a display control function for analyzing the spectrum characteristics of a measured signal and displaying a graph showing the spectrum characteristics according to the analysis result, and also has a marker position setting display control function for changing the position of a frequency marker displayed in association with the graph to the position of a frequency specified by a user, and updating the frequency indication value at the position to the value of the frequency at the changed position and displaying the same. The marker position setting display control function also has a display control function for changing the level marker to the position of a signal level corresponding to the position of the changed frequency marker, and updating the signal level indication value at the position to the value of the signal level corresponding to the frequency indicated by the changed frequency marker and displaying the same.

[0048] In order to realize the marker position setting display control function, the spectrum analyzer involved in the present invention has the following structure: a frequency mark which is displayed on the spectrum display screen in association with a graph and indicates the position of the frequency on the horizontal axis corresponding to a point on the graph is used as a tool for inputting the value of the frequency requested to be changed (the tool is displayed in an operable manner), and in the display of the spectrum display screen, an operation of inputting the desired frequency in the frequency indication box of the frequency mark is accepted and the position of the frequency mark is changed to the position of the above-mentioned desired frequency.

[0049] According to this structure, the spectrum analyzer involved in this embodiment can easily change the position of the frequency marker to the position of the desired frequency by simply inputting the desired frequency in the frequency indication frame of the frequency marker in the display of the spectrum display screen. As a result, it helps to promote the development of high-speed and high-performance spectrum analyzers in the future.

[0050] First, refer to Figure 1 to Figure 3 The structure of the spectrum analyzer according to the present invention will be described.

[0051] like Figure 1 As shown, a spectrum analyzer 1 according to an embodiment of the present invention includes a frequency conversion unit 10 , an analog / digital (A / D) converter 14 , a signal analysis unit 15 , a control unit 16 , an operation unit 20 , and a display unit 21 .

[0052] The frequency conversion unit 10 includes a mixer 11 , a local signal generator 12 , and a filter 13 .

[0053] The mixer 11 mixes the input signal (RF frequency) S of each frequency component received and processed by the previous stage structure unit. IN and the local signal L input from the local signal generator 12, the input signal S IN The RF frequency is converted into an intermediate frequency signal (IF frequency) and output to the filter 13, which is a functional part serving as a frequency conversion mechanism.

[0054] The local signal generator 12 generates a signal that is consistent with the above-mentioned input signal S IN The local signal generator 12 has a PLL (phase locked loop) circuit, for example, and is configured to output a local signal L having a frequency corresponding to data given from the outside. The frequency sweep of the local signal L is implemented by sequentially updating the frequency data input from the frequency sweep control unit 17.

[0055] The filter 13 is a filter function section that receives the IF signal frequency-converted by the mixer 11 , passes only a signal M having a frequency component in a predetermined frequency band of the input IF signal, and inputs the signal to the A / D converter 14 .

[0056] The A / D converter 14 is a functional unit that samples the analog signal M (the output signal of the frequency conversion unit 10 ) input from the filter 13 and converts the sampled analog signal into a digital signal sequence (digital signal Dm).

[0057] The signal analysis unit 15 is a functional unit that receives the digital signal Dm output from the A / D converter 14, analyzes the intensity (level) of the signal (IF) of each frequency band, and outputs the analysis result, i.e., analysis result data indicating the correspondence relationship (spectral characteristics) between the frequency and the signal level, to the control unit 16. The signal analysis unit 15 constitutes the signal analysis means of the present invention.

[0058] The control unit 16 is a functional unit that centrally controls the entire spectrum analyzer 1, and includes a frequency scanning control unit 17, a spectrum data acquisition unit 18, and a display control unit 19. The control unit 16 may be a control unit of the main body of the spectrum analyzer 1, or may be a structure in which a device such as a PC (personal computer) is separately provided. In any structure, the control unit 16 is composed of a microcomputer including a CPU (central control unit) and peripheral devices such as a ROM, a RAM, and an input / output port. For example, by executing a control program pre-stored in the ROM, the microcomputer functions as each functional unit such as the frequency scanning control unit 17, the spectrum data acquisition unit 18, and the display control unit 19.

[0059] The frequency sweep control unit 17 is a functional unit that performs frequency sweep control to change the frequency of the local signal L outputted from the local signal generator 12 to the mixer 11 within a frequency range designated by a user through the operation unit 20 , for example.

[0060] The spectrum data acquisition unit 18 acquires analysis result data (data indicating the correspondence relationship (spectrum characteristics) between frequency and signal level) obtained by analysis processing performed by the signal analysis unit 15 in accordance with the frequency sweep control of the frequency sweep control unit 17 .

[0061] The display control unit 19 performs a function to display a graph 60 (see FIG. 6 ) showing the spectrum characteristics on the display unit 21 based on the analysis result data acquired by the spectrum data acquisition unit 18 . Figure 3 ), and changes (shifts) the positions of the frequency marker 61 and the level marker 62 displayed in association with the graph 60 to the positions specified by the user and displays them as a display control portion.

[0062] The operation unit 20 includes input means such as various keys, switches, buttons, a mouse, and a keyboard 20a, and is operated by a user when making various settings related to measurement of a signal to be measured, etc. The keyboard 20a constitutes the input means of the present invention.

[0063] The display unit 21 is composed of, for example, a liquid crystal display, and displays a setting screen or measurement results related to the measurement of the measured signal (spectrum display screen 50: see Figure 3 ) and other functional parts.

[0064] In the spectrum analyzer 1 having the above configuration, the display control unit 19 has a spectrum display control function for displaying a graph 60 showing spectrum characteristics including a frequency mark 61 and a level mark 62 using the spectrum display screen 50 (see FIG. 5 ). Figure 3 (a)).

[0065] In addition, the display control unit 19 has a marker position setting display control function for setting the position of the frequency marker 61 indicating the frequency on the horizontal axis corresponding to a point of the graph 60 (for example, on the initial screen immediately after display (refer to Figure 3 (a)) changes the center frequency (center frequency) of the indication graph 60 on the user's screen to the position specified by the user, and displays the frequency value corresponding to the changed position in the frequency indication frame 61a. In addition, the position of the level mark 62 is also changed in accordance with the change in the position of the frequency mark 61, and the signal level value corresponding to the changed frequency position is displayed in the level indication frame 62a (refer to Figure 3 (b)).

[0066] In order to realize the above-mentioned spectrum display control function and mark position setting display control function, the display control unit 19 is configured to have Figure 2 The functional modules shown.

[0067] like Figure 2 As shown, in the spectrum analyzer 1 according to the present embodiment, the display control unit 19 includes a spectrum display control unit 31 , an input enabled state display control unit 32 , a marker position setting request accepting unit 33 , and a marker position setting display control unit 34 .

[0068] The spectrum display control unit 31 corresponds to the spectrum display control means of the present invention, and controls the display unit 21 to display the spectrum characteristics. An example of displaying the spectrum characteristics in the spectrum analyzer 1 according to the present embodiment is schematically shown in FIG. Figure 3 middle.

[0069] like Figure 3 As shown, the spectrum display control unit 31 displays the spectrum characteristics in the form of a graph 60 using the spectrum display screen 50 .

[0070] A frequency marker 61 and a level marker 62 are added to the graph 60. The frequency marker 61 is a tool for indicating the value of the frequency at a point on the graph 60 (the frequency corresponding to the position of the frequency marker 61 on the horizontal axis) in its frequency indication frame 61a.

[0071] The level marker 62 is a tool for indicating the value of the signal level at a point on the graph 60 (the signal level corresponding to the position of the level marker 62 on the vertical axis: corresponding to the frequency indicated by the frequency marker 61) in the level indication frame 62a. Figure 3 In the example of (a), the frequency mark 61 indicates the frequency value (position) of 3550.00 MHz, which is the center frequency of the graph 60, and the level mark 62 indicates the signal level of -10.00 dBm corresponding to the center frequency.

[0072] Furthermore, a frequency indication line 61b is displayed together with the frequency indication frame 61a of the frequency marker 61, which continuously indicates the value of the frequency indicated by the frequency indication frame 61a in a direction parallel to the vertical axis. On the other hand, a level indication line 62b is displayed together with the level indication frame 62a of the level marker 62, which continuously indicates the value of the signal level indicated by the level indication frame 62a in a direction parallel to the horizontal axis. Thus, the user can easily understand the correspondence (frequency to signal level) between the frequency value indicated by the frequency marker 61 in the frequency indication frame 61a and the level value of the signal indicated by the level marker 62 in the level indication frame 62a at the intersection point (a point on the above-mentioned graph) of the frequency indication line 61b and the level indication line 62b.

[0073] And, in Figure 2 In the configuration of the display control unit 19 shown, the input enabled state display control unit 32 controls to display the frequency indication frame 61a in a manner indicating an input enabled state in which a desired frequency can be input when the frequency mark 61 is selected in the display of the spectrum display screen 50 .

[0074] Specifically, for example, when the frequency mark 61 is selected by a predetermined operation of the user in the operation unit 20, the input state display control unit 32 adds a cursor 610 (see FIG. 1 ) indicating the input position of the value of the frequency requested to be changed. Figure 7 ) is displayed in the frequency indication frame 61a. Then, the frequency mark 61 is controlled to function as an input tool for specifying the frequency of the change of the requested frequency mark 61 based on the position of the cursor 610 in the frequency indication frame 61a. The input state display control unit 32 constitutes the input state display control mechanism of the present invention.

[0075] The marker position setting request accepting unit 33 is a functional unit that implements a process of accepting an input of a position (frequency value) for requesting a change of the frequency marker 61 from the position of the cursor 610 in the frequency indication frame 61a of the frequency marker 61. The input of the position for requesting a change (and the selection of the frequency marker 61 described above) can be performed using, for example, the keyboard 20a, which is one of the devices constituting the operating unit 20.

[0076] The marker position setting display control unit 34 performs the following display control: by accepting the input of the changed frequency into the frequency indication frame 61a of the frequency marker 61, the position of the frequency marker 61 is changed to the position of the input frequency, and the position of the level marker 62 is changed to the position of the signal level corresponding to the changed position of the frequency marker 61. Here, the marker position setting display control unit 34 updates the frequency indication value in the frequency indication frame 61a of the frequency marker 61 at the shifted position to the value of the frequency corresponding to the position.

[0077] Furthermore, regarding the level marker 62, the marker position setting display control unit 34 updates the level indication value in the level indication frame 62a to a signal level value corresponding to the updated frequency value in the frequency indication frame 61a of the frequency marker 61. The marker position setting display control unit 34 constitutes a marker position setting display control means of the present invention.

[0078] refer to Figure 3 A specific example of the mark position setting display control performed by the above-mentioned input enabled state display control unit 32 , the mark position setting request receiving unit 33 , and the mark position setting display control unit 34 will be described.

[0079] exist Figure 3 In the spectrum display screen 50 shown in the figure, the frequency mark 61 functions as an input tool for changing the value of the frequency indicated at the position to another desired value. Figure 3 (b) shows that the request will be Figure 3 (a) is an example of input to the frequency indication box 61a when the value of the frequency (center frequency) of 3550.00 MHz indicated by the frequency indication box 61a is changed to a new position of 3551.00 MHz.

[0080] After receiving the input (designation) of the frequency flag 61 requesting the frequency to be changed, the operation of setting the start is further received, such as Figure 3 As shown in (b), the mark position setting display control unit 34 changes the position of the frequency marker 61 to the designated frequency 3551.00MHz, and updates the display in the frequency indication frame 61a of the frequency marker 61 from the previous 3550.00MHz to the frequency value 3551.00MHz corresponding to the changed position. Accordingly, the mark position setting display control unit 34 implements the process of updating the level value -10.00dBm of the level marker 62 corresponding to the updated frequency value 3551.00MHz to -12.05dBm corresponding to the 3551.00MHz and displaying it in the level indication frame 62a.

[0081] In order to check the relationship between the frequency and the signal level in the desired frequency band of the spectrum characteristics (graph 60) displayed on the spectrum display screen 50 one by one, it is sometimes performed multiple times. Figure 3 (b) Mark position setting display control in the manner shown. Figure 2 In the configuration of the display control unit 19 shown, the mark position setting display control unit 34 cooperates with the input enabled state display control unit 32 and the mark position setting request accepting unit 33 to execute the mark position setting display control in this case.

[0082] Next, refer to Figure 4 The flowchart shown in FIG. 1 is used to explain the spectrum measurement operation of the spectrum analyzer 1 according to the present embodiment. Here, the spectrum analyzer 1 inputs, for example, a signal in the millimeter wave band, extracts the input signal S IN A signal (measured signal) in a frequency band (analysis target frequency band) preset by a user is input into the signal analysis unit 15 after A / D conversion, and the spectrum characteristics of the signal are measured.

[0083] In order to perform spectrum measurement, the user performs an operation to set the scanning frequency range (analysis target frequency range) of the spectrum analyzer 1 in the operation unit 20 (step S1). As parameters set by this operation, for example, the maximum value of the input signal level, the center frequency, the frequency width (span frequency), the number of samples to be obtained, etc. can be cited. Here, the starting frequency and the ending frequency can also be set instead of the center frequency and the span frequency. In this case, the frequency scanning control unit 17 can calculate the span frequency by (starting frequency + ending frequency) ÷ 2 for the center frequency and (ending frequency - starting frequency).

[0084] When the setting operation in step S1 is completed and then, for example, a measurement start operation is performed through the operation unit 20, the control unit 16 generates a signal S in the millimeter wave band input to the mixer 11. IN The signal in the scanning frequency range set in step S1 is extracted, and the drive control of each part of the device is performed in order to analyze the spectrum characteristics of the signal and display the analysis result.

[0085] First, in the control unit 16, the frequency sweep control unit 17 drives and controls the local signal generator 12 according to the settings of the parameters (center frequency and span frequency or start frequency and end frequency, etc.) in the above step S1, and implements frequency sweep control for sweeping the frequency of the local signal L input from the local signal generator 12 to the mixer 11 in a predetermined step (step S2). At this time, the frequency sweep control unit 17 outputs information (frequency information) f of each frequency involved in the sweep control to the signal analysis unit 15.

[0086] Corresponding to the scanning control of the local signal L in step S2, the control unit 16 drives and controls the frequency conversion unit 10, and mixes the frequency-scanned local signal L with the input signal S through the mixer 11. IN Then, a frequency conversion process is performed to convert the mixed signal into an intermediate frequency (IF) signal (step S3).

[0087] Moreover, the control unit 16 filters the mixed signal converted into the intermediate frequency through the filter 13, extracts the signal M of the specified intermediate frequency (IF), that is, the frequency component of the analysis object, from the mixed signal (step S4), and drives and controls the frequency conversion unit 10 to output the signal to the A / D converter 14.

[0088] Next, the A / D converter 14 converts the analysis target signal M input from the frequency conversion unit 10 from an analog signal into a digital signal Dm (step S5 ), and inputs the digital signal to the signal analysis unit 15 .

[0089] The signal analysis unit 15 performs a process of analyzing the frequency spectrum characteristics of the digital signal Dm based on the digital signal Dm input from the A / D converter 14 and the frequency information f output from the frequency sweep control unit 17 corresponding to the above-mentioned frequency sweep control (refer to step S2) (step S6). Here, the signal analysis unit 15 performs the following process: the digital signal Dm is set as an object, the frequency and signal level of the analysis target frequency component extracted in the above-mentioned step S4 are analyzed, and the analysis result is stored in a predetermined storage area (for example, RAM) as spectrum data indicating the corresponding relationship between the frequency and the signal level.

[0090] While executing (or after completing) the analysis processing of the digital signal Dm in step S6, the spectrum data acquisition unit 18 reads (acquires) the spectrum data stored in the RAM, for example, according to a prescribed spectrum display operation performed by the operation unit 20, and inputs it to the display control unit 19 (step S7).

[0091] The display control unit 19 then displays a waveform (graph (refer to Figure 3 The display control of the graph 60) is displayed on the display unit 21 (step S8).

[0092] Next, refer to Figure 5 The flowchart shown is Figure 4 The details of the spectrum characteristic display control in step S8 are described below. Figure 5 As shown, Figure 4 The display control of the spectrum characteristics in step S8 includes: displaying a graph 60 (refer to Figure 3) control (step S10); and a frequency marker 61 displayed in association with the graph 60 is used as an input tool to specify a desired frequency, and the position of the frequency marker 61 is changed to the position of the specified frequency to update the value of the frequency indicated by the frequency marker 61 based on the frequency specification mark position setting display control (steps S11 to S15).

[0093] In the spectrum analyzer 1 according to the present embodiment, if Figure 4 In step S8, the display control of the spectrum characteristics is started, and then Figure 5 As shown, the spectrum display control unit 31 displays a graph 60 of spectrum characteristics using the spectrum display screen 50 (step S10 ).

[0094] In the display of the spectrum display screen 50, the input state display control unit 32 performs control as follows: accepts the operation of selecting (clicking) the frequency mark 61 on the spectrum display screen 50 (step S11), and displays the frequency indication box 61a of the frequency mark 61 in a manner that can be used as a frequency input tool (input state) (step S12).

[0095] Specifically, in step S12, the input status display control unit 32 may be triggered by the user selecting the frequency mark 61 in step S11, for example, Figure 7 As shown, a cursor 610 is displayed in the frequency indication frame 61a of the frequency mark 61, and display control is implemented to set the cursor 610 to an input-enabled state (for example, blinking display).

[0096] While the cursor 610 is blinking in step S12 , the marker position setting request accepting unit 33 receives input of a desired frequency (the value of the frequency requested to be changed) from the position of the cursor in the frequency indication frame 61 a of the frequency marker 61 (step S13 ).

[0097] Here, if the input of the desired frequency is accepted with the cursor in the frequency indication frame 61a as the starting point, the mark position setting display control unit 34 controls the position of the frequency mark 61 to be changed to the position of the input frequency, and updates the value of the frequency in the frequency indication frame 61a to the value of the frequency corresponding to the changed position and displays it (step S14).

[0098] Next, the mark position setting display control unit 34 controls to change the position of the level mark 62 to the position of the signal level corresponding to the updated frequency position, and updates the display of the level indication frame 62a to the value of the signal level corresponding to the changed position and displays it (step S15).

[0099] Next, the marker position setting display control unit 34 checks whether an operation to end the display of the spectrum display screen 50 has been performed (step S16 ).

[0100] Here, when the operation to end the display of the spectrum display screen 50 has not been performed (No in step S16 ), the display control unit 19 proceeds to step S11 , and then performs the operation control from step S11 to step S16 described above.

[0101] Here, the display control unit 19 repeatedly implements the processing of steps S11 to S16 while it is determined that the operation of ending the display of the spectrum characteristics has not been performed in step S16. And during this period, by performing the operation of ending the display of the spectrum characteristics in step S16 ("Yes" in step S16), the above series of marker position setting display controls targeting the frequency marker 61 and the level marker 62 are ended.

[0102] Next, refer to Figure 6 , Figure 7 right Figure 5 A specific display example of the spectrum display screen 50 in the spectrum characteristic display control in step S10 and the marker position setting display control in steps S13 to S15 will be described.

[0103] Figure 6 , Figure 7 The spectrum display screen 50 shown shows Figure 3 The detailed implementation of the spectrum display screen 50 shown in FIG. Figure 6 , Figure 7 As shown, the spectrum display screen 50 includes a graph display area 51 , a measurement status display area 54 , and a measurement status confirmation area 55 .

[0104] The graph display area 51 includes a graph area 52 for displaying a graph 60 of spectral characteristics and a tool area 53 where tools 53 a , 53 b , 53 c , 53 d , and 53 e for displaying setting conditions such as measurement conditions of the spectral characteristics displayed in the graph 60 are arranged.

[0105] The graph area 52 is composed of a two-dimensional plane defined by a horizontal axis and a vertical axis. The horizontal axis is provided with a frequency scale, and the vertical axis is provided with a signal level scale. The unit of the frequency on the horizontal axis is, for example, "MHz". Figure 6 , Figure 7 In the example, a frequency scale corresponding to the range of 2950 to 3050 MHz is provided. On the other hand, the unit of the signal level on the vertical axis is, for example, "dBm". Figure 6 , Figure 7 In the example of FIG. 1 , a scale of signal levels corresponding to a range of -12 to -115 dBm is provided.

[0106] The graph area 52 displays a graph 60 showing spectrum characteristics on the above-mentioned two-dimensional plane, and can display a frequency marker 61 and a level marker 62 corresponding to the display of the graph 60. The frequency marker 61 is composed of, for example, a rectangular frequency indication frame 61a, and is a tool function that displays the value of the frequency on the horizontal axis indicated by the frequency marker 61 in the frame. When the graph 60 is first displayed (initial screen) according to the basic display control of the spectrum display control unit 31 (display control when the marker position setting display control is not applied), the frequency marker 61 becomes a value indicating the center frequency of the preset analysis target frequency range (in the Figure 6 In the example, it is 3000.00MHz).

[0107] The level mark 62 is also composed of a rectangular level indication frame 62a, for example, and has a tool function of displaying the value of the signal level on the vertical axis indicated by the frequency mark 61 in the frame. Figure 6 In the example shown in FIG. 6 , the level mark 62 indicates a signal level of −40.80 dBm corresponding to the center frequency 3000.00 MHz indicated by the frequency mark 61 .

[0108] A frequency indication line 61b and a level indication line 62b are further displayed in association with the frequency mark 61 and the level mark 62, respectively. The frequency indication line 61b is formed by a line that continuously draws out the value of the frequency indicated by the frequency mark 61 along the vertical axis from the frequency mark 61, and the level indication line 62b is formed by a line that continuously draws out the value of the signal level indicated by the level mark 62 along the horizontal axis from the level mark 62. The frequency indication line 61b and the level indication line 62b intersect at a point on the graph 60, and are useful tools for quickly and easily grasping the correspondence between the frequency indicated by the frequency mark 61 and the signal level indicated by the level mark 62 (frequency versus signal level) from that point.

[0109] In the tool area 53 adjacent to the chart area 52 having the above structure, tools 53a and 53b are tools for displaying the setting status of whether to measure the spectrum characteristics (chart 60) once ("Single") or continuously ("Continuous"). Tool 53c is a tool for displaying the setting status of the measurement period (Periodic Time) (20ms in this example). Tools 53d and 53e are tools for displaying the setting status of the analysis interval (Analysis BW) and the input signal type (Input Trigger Source). Figure 6 In the example, Analysis BW is set to 100 MHz and InputTrigger Source is set to Internal.

[0110] Furthermore, in the spectrum display screen 50, in the measurement status display area 54 arranged below the graph display area 51, the measurement results of these RF signals #1, #2, #3, and #4 are displayed in bar graphs and numerical values ​​corresponding to multiple RF signals of the analysis object (in this example, four RF signals of different frequency bands identified by #1 to #4).

[0111] Furthermore, in the spectrum display screen 50, for example, in the measurement status confirmation area 55 arranged on the right side of the graph display area 51, multiple confirmation items 55a~55i related to an RF signal (in this example, the RF signal identified by #1) selected by the user from the four RF signals #1, #2, #3, and #4 of the analysis object are displayed.

[0112] The confirmation item 55a is an item indicating which signal the analysis result is, and in this example, it is displayed that the analysis result is the RF signal #1.

[0113] The confirmation item 55 b is an item that displays the progress of the analysis process using, for example, a pie chart.

[0114] The confirmation item 55c is an item for displaying information indicating the storage status of the analysis result data. In this example, it is displayed that the information "No saved data" is stored in the item "Directory Name".

[0115] The confirmation item 55d is an item that displays the center frequency of each RF signal to be analyzed. In this example, the value of the center frequency set when analyzing the RF signals to be analyzed (RF1, RF2 (equivalent to #1, #2)) is 3000.000 000 MHz.

[0116] The confirmation item 55e is also an item that displays the center frequency of each RF signal to be analyzed. In this example, the center frequency value 3750.000 000 MHz set when analyzing the RF signals to be analyzed (RF3, RF4 (equivalent to #3, #4)) is displayed.

[0117] Confirmation item 55f shows the analysis results of the signal levels of the RF signal (RF1) and the RF signal (RF2) when the setting value of the center frequency is 3000.000 000 MHz, which are -5.00 dBm and -83.47 dBm.

[0118] Confirmation item 55g shows the analysis results of the signal levels of the RF signal (RF3) and the RF signal (RF4) when the center frequency setting value is 3750.000 000 MHz, which are -81.40 dBm and -82.08 dBm.

[0119] The confirmation item 55h is an item that displays the recording time of the analysis result data indicating each of the above-mentioned analysis results.

[0120] The confirmation item 55i displays a REC (record) button used when recording the analysis results of the RF signals #1, #2, #3, and #4. The REC button is displayed so as to be able to instruct the start and end of recording.

[0121] (Basic use of spectrum display screen)

[0122] In the spectrum analyzer 1 according to the present embodiment, when measuring the spectrum characteristics, the spectrum display control unit 31 displays the spectrum according to the input signal S IN The analysis results show that Figure 6 The spectrum display screen 50 (refer to Figure 4 Step S8, Figure 5 Step S10).

[0123] exist Figure 6 In the spectrum display screen 50 shown, analysis processing is performed on four RF signals #1 to #4, and a graph 60 (see graph area 52) showing the spectrum characteristics of RF signal #1 (see measurement status display area 54) among them is displayed.

[0124] Regarding RF signal #1, the user can recognize the analysis results of the spectrum characteristics in the frequency range of 2950 MHz to 3050 MHz with the center frequency of 3000 MHz as the center from the graph 60 .

[0125] In the spectrum display screen 50, in the graph area 52, a frequency marker 61 and a level marker 62 are displayed in association with the graph 60. Here, the frequency indicator frame 61a of the frequency marker 61 indicates the center frequency (=3000.00 MHz), and the level indicator frame 62a of the level marker 62 indicates the signal level -40.80 dBm corresponding to the center frequency (=3000.00 MHz). Thus, the user can confirm from the spectrum display screen 50 that the RF signal #1 has a signal level of about -40.80 dBm in the frequency band of the center frequency.

[0126] According to the spectrum display screen 50, similarly to the RF signal #1, the desired RF signal can be selectively specified through the selection operation in the measurement status display area 54 for RF signals #2, #3, and #4, thereby confirming the signal level of its center frequency (wherein the center frequency of RF signals #3 and #4 is 3750.00 MHz).

[0127] On the other hand, regarding RF signals #1 to #4, the user may need to confirm the signal levels of frequencies other than the center frequency (frequencies near the center frequency, etc., any desired frequencies). In this case, the user uses the frequency marker 61 associated with the graph 60 of the RF signal #1 being displayed (selected) as an input tool to start the marker position setting display control described below.

[0128] (Marker position setting display control of spectrum display screen)

[0129] To execute the marker position setting display control, first, an operation (click or the like) is performed to select the frequency marker 61 displayed on the spectrum display screen 50 in association with the graph 60. This operation can be performed using, for example, the keyboard 20a constituting the operation unit 20.

[0130] By accepting the above operation, the input state display control unit 32 displays, for example, Figure 7 As shown, a cursor 610 indicating an input position is displayed in a flashing state, that is, in a state in which input is possible, within a frequency indication frame 61a of a frequency mark 61.

[0131] In this state, the user then inputs a desired frequency value at the position of cursor 610. Figure 7 , a state in which a frequency value of, for example, 3001 (GHz) is input to the frequency indication box 61a of the frequency marker 61 is illustrated.

[0132] If the mark position setting request receiving unit 33 receives the operation of inputting the desired frequency value into the frequency indication frame 61a of the frequency mark 61 through the above operation, the mark position setting display control unit 34 changes the display of the frequency mark 61 to the position indicating the input frequency 3001.00MHz. Figure 7 As shown, the display content in the frequency indication frame 61a changes from 3000.00MHz before input (reference Figure 6 ) is changed to the input 3001.00MHz and displayed.

[0133] Similarly, on the spectrum display screen 50, when RF signal #1 is selected, it is possible to perform a marker position setting display control by selecting and specifying the frequency marker 61, displaying the cursor 610 in the frequency indication frame 61a, inputting other desired frequencies to the position of the cursor 610 in the frequency indication frame 61a, changing the position of the frequency marker 61 to a position indicating other desired frequencies, and changing the position of the level marker 62 to a position corresponding to the signal level of the other desired frequencies and displaying the same.

[0134] Furthermore, even when RF signals #2, #3, and #4 are selected on the spectrum display screen 50, it is also possible to perform selection and designation via the frequency marker 61, display of the cursor 610 in the frequency indication frame 61a, input of the desired frequency at the position of the cursor 610 in the frequency indication frame 61a, change the position of the frequency marker 61 to a position that can indicate the designated frequency, display the value of the designated frequency in the frequency indication frame 61a, and also change the position of the level marker 62 to a position that indicates the signal level corresponding to the frequency displayed in the frequency indication frame 61a, and display control to display the signal level at the marker position in the level indication frame 62a.

[0135] The selection and specification of the frequency mark 61, the display of the cursor 610 in the frequency indication frame 61a, and the input operation of the desired frequency using the cursor 610 in the frequency indication frame 61a can be performed from, for example, an input device constituting the operation unit 20, such as a keyboard 20a (see Figure 2 )conduct.

[0136] As described above, the spectrum analyzer 1 according to the present embodiment has the following configuration, namely, it includes: the spectrum display control section 31, which displays the spectrum display screen 50 having the graph area 52 defined by the horizontal axis having the frequency scale and the vertical axis having the signal level scale, and displays the graph 60 indicating the spectrum characteristics of the measured signal analyzed by the signal analysis section 15, the frequency mark 61 having the frequency indication frame 61a indicating the value of the frequency on the horizontal axis corresponding to a point on the graph 60, and the level mark 62 having the level indication frame 62a indicating the value of the signal level on the vertical axis corresponding to the above point on the graph. area 52; an input-enabled state display control unit 32, which displays a frequency indication frame 61a in a manner indicating an input-enabled state in which a desired frequency can be input, in response to an operation of selecting a frequency mark 61 through the keyboard 20a of the operating unit 20, in the display of the spectrum display screen 50; and a mark position setting display control unit 34, which accepts an input of a desired frequency to the frequency indication frame 61a through the keyboard 20a when the input is enabled, changes the position of the frequency mark 61 on the horizontal axis to the position of the input frequency, and updates the value of the frequency indicated by the frequency indication frame 61a to the value of the input frequency and displays it.

[0137] According to this configuration, the spectrum analyzer 1 according to the present embodiment can use the frequency marker 61, which is displayed on the spectrum display screen 50 in association with the graph 60 and indicates the position of the frequency corresponding to a point on the graph 60, as a tool for inputting the value of the frequency requested to be changed, and can simply change the position of the frequency marker 61 to the position of the desired frequency by a simple operation of inputting the desired frequency in the frequency indication box 61a of the frequency marker 61 while the spectrum display screen 50 is displayed. Thus, when setting the position of the frequency marker 61, there is no need to perform cumbersome work such as opening other screens and operating a physical encoder, thereby significantly reducing the workload involved in setting the position of the frequency marker 61.

[0138] Furthermore, the spectrum analyzer 1 involved in this embodiment has the following structure, that is, the mark position setting display control unit 34 changes the position of the level mark 62 on the vertical axis to the position of the signal level corresponding to the updated frequency in response to the change in the position of the frequency mark 61, and updates the value of the signal level indicated by the level indication box 62a to a value corresponding to the position of the changed signal level and displays it.

[0139] According to this structure, when the spectrum analyzer 1 involved in this embodiment sets the position of the frequency marker 61, it can also simultaneously and easily set the position setting of the level mark 62 corresponding to the position of the set frequency marker 61, thereby reducing the burden of confirmation work when it is necessary to repeatedly confirm the relationship between the frequency and the signal level for any desired frequency.

[0140] Furthermore, the spectrum analyzer 1 involved in this embodiment has the following structure, that is, the mark position setting display control unit 34 also displays a frequency indication line 61b extending from the frequency position indicated by the frequency indication frame 61a in parallel with the vertical axis and a level indication line 62b extending from the signal level position indicated by the level indication frame 62a along the horizontal axis in the chart area 52.

[0141] With this configuration, the spectrum analyzer 1 according to this embodiment can easily check the waveform near the intersection of the frequency indicator line 61b and the level indicator line 62b on the spectrum characteristic graph 60 even after the positions of the frequency marker 61 and the level marker 62 are set.

[0142] Furthermore, the spectrum analyzer 1 involved in this embodiment has the following structure, that is, the signal analysis unit 15 analyzes the spectral characteristics of multiple radio frequency (RF) signals in different frequency ranges of the millimeter wave band as the measured signal, and the spectrum display control unit 31 displays a graph 60 representing the spectral characteristics of an RF signal selected from the multiple RF signals.

[0143] According to this structure, the spectrum analyzer 1 involved in this embodiment can set the position of the frequency mark 61 and the level mark 62 through simple operations without having to select one RF signal from among the multiple RF signals in each frequency range of the millimeter wave band, open other screens, etc.

[0144] Furthermore, the frequency marker position setting method of the spectrum analyzer 1 according to the present embodiment has the following structure, that is, the spectrum analyzer 1 has a spectrum display control unit 31, the spectrum display control unit 31 displays a spectrum display screen 50 having a graph area 52 defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph 60 indicating the spectrum characteristics of the measured signal analyzed by the signal analysis unit 15, a frequency marker 61 having a frequency indication frame 61a indicating a value of the frequency on the horizontal axis corresponding to a point on the graph 60, and a level marker 62 having a level indication frame 62a indicating a value of the signal level on the vertical axis corresponding to the above point in the graph area 52, The frequency marker position setting method of the spectrum analyzer 1 includes: an input-enabled state display control step S12, in which, in the display of the spectrum display screen 50, according to the operation of selecting the frequency marker 61 through the keyboard 20a of the operation unit 20, the frequency indication frame 61a is displayed in a manner indicating an input-enabled state in which a desired frequency can be input; an input acceptance step S13, in which an input of a desired frequency to the frequency indication frame 61a through the keyboard 20a is accepted when the input is enabled; and a frequency marker position setting display control step S14, in which the position of the frequency marker 61 on the horizontal axis is changed to the position of the input frequency, and the value of the frequency indicated by the frequency indication frame 61a is updated to the value of the input frequency and displayed.

[0145] According to this structure, the frequency marker position setting method of the spectrum analyzer 1 involved in this embodiment can use the frequency marker 61 that is displayed on the spectrum display screen 50 in association with the graph 60 and indicates the position of the frequency corresponding to a point on the graph 60 as a tool for inputting the value of the frequency requested to be changed, and in the display of the spectrum display screen 50, the position of the frequency marker 61 is simply changed to the position of the desired frequency (step S14) by a simple operation of inputting the desired frequency in the frequency indication box 61a of the frequency marker 61 (step S13). As a result, when setting the position of the frequency marker 61, it is completely unnecessary to open other screens, operate the physical encoder, and other cumbersome work, thereby greatly reducing the workload involved in setting the position of the frequency marker 61.

[0146] (Variation Example)

[0147] In the above embodiment, a desired frequency is input into the frequency indication box 61a of the frequency marker 61, the position of the frequency marker 61 is changed to a position corresponding to the input frequency, and the frequency indication value in the frequency indication box 61a is updated to the frequency of the changed position.

[0148] In contrast, the spectrum analyzer 1A according to the modified example has a configuration in which a frequency marker setting method based on the movement of the frequency marker 61 is installed, that is, on the spectrum display screen 50A (see Fig. 9 , Fig.10 ) in the chart area 52, while keeping the position of the chart 60 fixed, the frequency mark 61 displayed in association with the chart 60 is moved along the horizontal axis (frequency axis) (displayed in a manner that the frequency mark 61 can be moved), and the value of the frequency corresponding to the position of the moved frequency mark 61 is sequentially updated and displayed in its frequency indication frame 61a.

[0149] The configuration of a display control unit 19A of a spectrum analyzer 1A according to a modified example is shown in FIG. Figure 8 Furthermore, a display example of a spectrum display screen 50A used in the spectrum analyzer 1A according to the modification example is shown in FIG. Fig. 9 , Fig.10 middle. Fig. 9 FIG. 5 shows a display example of the spectrum display screen 50A when the graph region 52 is selected and the frame 52a of the graph region 52 becomes operable (movement operation of the frequency marker 61). Fig.10 A display example of the spectrum display screen 50A is shown when the marker position is set according to the marker position setting display control in response to the move operation of the frequency marker 61 being received from the operable state.

[0150] The basic structure of the spectrum analyzer 1A according to the modification example is similar to that of the spectrum analyzer 1 according to the above-mentioned embodiment (see Figure 1 ) is the same as that of the spectrum analyzer 1 according to the above-mentioned embodiment, and has a configuration in which only a display control unit 19A is different from the display control unit 19 of the spectrum analyzer 1 involved in the above-mentioned embodiment.

[0151] like Figure 8 As shown, in the spectrum analyzer 1A according to the modification, the display control unit 19A includes a spectrum display control unit 31, an operable state display control unit 32A, a marker position setting request receiving unit 33A, and a marker position setting display control unit 34A. Figure 8 In the embodiment, the display control unit 19 (refer to Figure 2 ) The same structural parts are marked with the same symbols.

[0152] exist Figure 8In the structure of the display control unit 19A shown in FIG. 1 , the operable state display control unit 32A is a functional unit that displays a frame 52a surrounding the graph area 52 on the spectrum display screen 50A in a manner indicating a state (operable state) in which a move operation of the frequency marker 61 can be accepted, for example, in response to an operation of selecting the graph area 52 on the spectrum display screen 50A by the user. As a manner of indicating the operable state of the graph area 52, for example, Fig. 9 , Fig.10 As shown, there is a method of displaying the frame 52a of the graph area 52 in a blinking state. The operable state display control unit 32A constitutes the operable state display control means of the present invention.

[0153] The mark position setting request receiving unit 33A is a functional unit that receives an operation (mark position setting request operation) for moving the frequency mark 61 along the horizontal axis in the graph area 52 displayed in a manner indicating an operable state. The movement of the frequency mark 61 along the horizontal axis can be performed, for example, by the keyboard 20a (see FIG. 20 ) which is one of the devices constituting the operating unit 20. Figure 2 ) by operating the left and right movement buttons.

[0154] The mark position setting display control unit 34A has the following function: by accepting an operation of moving the frequency marker 61 to the left or right using the left move button or the right move button (an operation requesting a mark position selection), the position of the frequency marker 61 is displayed while being moved to the right or left along the horizontal axis relative to the graph 60 displayed at a fixed position.

[0155] In addition, the mark position setting display control unit 34A has the following frequency mark position setting display control function: according to the change of the position of the frequency mark 61, the frequency indication value in the frequency indication frame 61a is sequentially updated to the value of the frequency corresponding to the changed position (the value of the frequency on the graph 60 where the frequency indication line 61b extending from the frequency mark 61 along the vertical axis intersects) and displayed.

[0156] Furthermore, the mark position setting display control unit 34A implements the following display control: based on changing the position of the level mark 62 to the position of the signal level value corresponding to the updated frequency value in the frequency indication frame 61a of the frequency mark 61, the signal level value in the level indication frame 62a is updated to the signal level value corresponding to the updated frequency value in the frequency indication frame 61a of the frequency mark 61 (the signal level value on the graph 60 where the level indication line 62b extending from the level mark 62 along the horizontal axis intersects) and displayed. The mark position setting display control unit 34A constitutes the mark position setting display control mechanism of the present invention.

[0157] Next, refer to Fig.11The flowchart shown in the figure explains the marker position setting display control operation based on the movement of the frequency marker 61 using the spectrum display screen 50A in the spectrum analyzer 1A according to the modification.

[0158] In the spectrum analyzer 1A according to the modification, the Figure 4 The spectrum characteristic measurement operation is shown in the flowchart. Fig.11 As shown, in the spectral characteristic measuring operation, in the process of displaying the spectral characteristic in step S8, the display control unit 19A executes the display corresponding to the graph 60 (refer to Fig. 9 ) display control (step S10) and the operation of moving the frequency mark 61, and updating and displaying the display content (frequency indication value) of the frequency indication frame 61a of the frequency mark 61 and the display content (signal level indication value) of the level indication frame 62a of the level mark 62, and the mark position setting display control based on the movement of the frequency mark 61 (steps S11A, S12A, S13A, S14A, S15A).

[0159] In the spectrum analyzer 1A according to the modification, when starting Figure 4 The display control of the spectrum characteristics in step S8 is as follows Fig.11 As shown, the spectrum display control unit 31 uses Fig. 9 The spectrum display screen 50A shown here displays a graph 60 of spectrum characteristics (step S10). The spectrum display screen 50A shown here is different from the spectrum display screen 50 used in the spectrum analyzer 1 according to the above-mentioned embodiment (see FIG. 5A ), except that the frequency mark 61 can be displayed in a movable manner along the horizontal axis direction and the frame 52a surrounding the graph area 52 can be displayed in a manner indicating an operable state. Figure 6 )same.

[0160] In the display of the spectrum display screen 50A, the operable state display control unit 32A performs the following display control: accepts the operation of selecting (clicking) the chart area 52 on the spectrum display screen 50 (step S11A), and displays the chart area 52 in a manner indicating a state (operable state) in which the operation of moving the frequency mark 61 in the horizontal axis direction can be accepted (step S12A).

[0161] Specifically, in step S12A, the operable state display control unit 32A performs the following display control: in response to the user selecting the chart area 52 in step S11A, for example, Fig. 9 As shown, a frame 52a surrounding the chart area 52 (chart 60) is displayed to indicate that the chart area 52 is in an operable state (active state), for example, in a flashing state. Fig. 9In FIG. 5 , the frame 52 a surrounding the graph area 52 is shown by a dotted line to indicate that the graph area 52 is being displayed in a flashing manner.

[0162] While the frame 52 a surrounding the graph area 52 is flashing in step S12A, the marker position setting request accepting unit 33A performs processing for accepting an operation of moving the frequency marker 61 in the graph area 52 in the horizontal axis direction (step S13A).

[0163] Here, the user can appropriately move the frequency marker 61 rightward or leftward along the horizontal axis by operating, for example, the left movement key and the horizontal movement key of the keyboard 20a constituting the operation unit 20. At this time, the position of the graph 60 does not change, for example, it is always fixedly displayed near the center position on the horizontal axis.

[0164] Therefore, regarding the spectrum display screen 50A, Fig. 9 In the spectrum display screen 50A shown in FIG. 1 , if the frequency marker 61 is moved to the right ( Fig. 9 If the frequency indicator frame 61a of the frequency marker 61 is operated to move in the direction of the arrow a1), the value of the frequency indicated by the frequency indicator frame 61a of the frequency marker 61 gradually changes from 3000.00 MHz to a higher frequency. On the contrary, if the frequency marker 61 is moved to the left ( Fig. 9 By operating in a manner of moving in the direction of arrow a2), the value of the frequency indicated by the frequency indication line 61b of the frequency marker 61 gradually changes from 3000.00 MHz to a lower frequency value.

[0165] In the above step S13A, if the mark position setting request receiving unit 33A accepts the movement operation of the frequency mark 61 in the horizontal axis direction, the mark position setting display control unit 34A implements the following processing: while maintaining the chart 60 at a fixed position, the position of the frequency mark 61 is changed to the position of the frequency corresponding to the above-mentioned movement operation on the horizontal axis, and the display content in the frequency indication box 61a is sequentially updated to the value of the frequency corresponding to the changed position and displayed (step S14A).

[0166] At this time, with respect to the level mark 62, the mark position setting display control unit 34A implements the following control: the position of the level mark 62 is changed to a position of a signal level corresponding to the value of the frequency that is sequentially updated and displayed in the frequency indication box 61a of the frequency mark 61, and the display content in the level indication box 62a of the level mark 62 is sequentially updated to the value of the signal level corresponding to the changed position and displayed (step S15A).

[0167] Next, the marker position setting display control unit 34A checks whether an operation to end the display of the spectrum display screen 50A has been performed (step S16 ).

[0168] Here, if the operation to end the display of the spectrum display screen 50A has not been performed (No in step S16), the display control unit 19A shifts to step S11A and performs the operation control from the above-mentioned steps S11A to S16.

[0169] During the period when it is determined that the display of the spectrum characteristics has not been terminated in step S16, the display control unit 19A repeatedly performs the processing of steps S11A to S16. Furthermore, during this period, by performing the display of the spectrum characteristics in step S16 ("Yes" in step S16), the above series of marker position setting display controls targeting the frequency marker 61 and the level marker 62 are terminated.

[0170] Next, refer to Fig. 9 , Fig.10 Further Fig.11 A specific display example of the spectrum display screen 50A related to the spectrum characteristic display control in step S10 and the marker position setting display control based on the movement of the frequency marker 61 in steps S11A, S12A, S13A, S14A, and S15A will be described in detail.

[0171] (Basic use of spectrum display screen)

[0172] In the spectrum analyzer 1A according to the modification, in the measurement of the spectrum characteristics, the input signal S IN The analysis results, for example, show that Fig. 9 The spectrum display screen 50A (refer to Figure 4 Step S8, Fig.11 Step S10).

[0173] exist Fig. 9 In the spectrum display screen 50A shown, in the graph 60 of the spectrum characteristics of the RF signal #1, the frequency mark 61 indicates the center frequency (=3000.00 MHz), and the level mark 62 indicates the signal level -40.80 dBm corresponding to the center frequency (=3000.00 MHz). Thus, the user can confirm from the spectrum display screen 50A that the RF signal #1 has a signal level of about -40.80 dBm at the center frequency.

[0174] According to the spectrum display screen 50A, through the same operation, not only with respect to RF signal #1, but also with respect to RF signals #2, #3, and #4, the desired RF signal can be selectively specified through the selection operation in the measurement status display area 54, thereby confirming the degree of signal level at the center frequency (wherein the center frequency of RF signals #3 and #4 is 3750.00 MHz).

[0175] On the other hand, regarding RF signals #1 to #4, for example, when there is an urgent need to confirm the degree of signal level at any desired frequency such as a frequency near the center frequency, the user moves the frequency marker 61 on the spectrum display screen 50A being displayed (selected) along the horizontal axis, and starts the marker position setting display control based on the movement of the frequency marker 61 by sequentially updating the value of the frequency indicated by the frequency indication box 61a.

[0176] (Marker position setting display control based on frequency marker movement on the spectrum display screen)

[0177] In order to execute the marker position setting display control based on the movement of the frequency marker, the user first performs an operation (click or the like) to select the graph area 52 of the spectrum display screen 50A.

[0178] By accepting the above operation, in the operable state display control unit 32A, for example, Fig. 9 As shown in FIG. 5 , the frame 52a surrounding the chart area 52 is displayed as active. Fig. 9 In the example of FIG. 5 , the frame 52 a is represented by a dotted line, for example, to show that it is in a flashing state.

[0179] Next, in this state, the user performs an operation to move the frequency marker 61 displayed in the graph area 52 in association with the graph 60 to the right or left in a desired direction (the direction of arrow a1 or the direction of arrow a2) from the operation unit 20. The movement operation of the frequency marker 61 can be performed by using, for example, the keyboard 20a constituting the operation unit 20 and pressing the right movement key or the left movement key.

[0180] Fig. 9 In the embodiment, if the frequency mark 61 is moved, for example, to the right (arrow a1 direction), the value of the frequency indicated by the frequency indication frame 61a is gradually updated to a high frequency. On the contrary, if the frequency mark 61 is moved, for example, to the left (arrow a2 direction), the value of the frequency indicated by the frequency indication frame 61a is gradually updated to a low frequency.

[0181] Fig.10 FIG. 5 shows an example of a display on the spectrum display screen 50A when the frequency marker 61 is moved in the direction of arrow a1 so that the value of the frequency indicated by the frequency indication frame 61a is gradually changed to a higher frequency. Fig.10 In particular, an example of a display on the spectrum display screen 50A is shown when the position of the frequency marker 61 is continuously changed in the right direction to indicate a position of 3002.60 MHz.

[0182] At this time, the position of the level mark 62 is changed to a position indicating the signal level corresponding to the frequency 3002.60 MHz displayed in the frequency indication frame 61 a , and the signal level value displayed in the level indication frame 62 a is updated to the signal level -39.14 dBm corresponding to the frequency 3002.60 MHz in the graph 60 and displayed.

[0183] In the spectrum analyzer 1A according to the modification, Fig.10 In the display of the spectrum display screen 50A shown, by moving the position of the frequency marker 61 so as to also indicate other arbitrary frequencies, the relationship between the frequency and the signal level corresponding to the arbitrary frequency of the RF signal #1 can be confirmed. Similarly, for the other RF signals #2, #3, and #4, the signal level values ​​corresponding to the values ​​of the arbitrary frequencies can be confirmed one by one through the selection and specification of the graph area 52, the display of the active state of the graph area 52, and the movement of the frequency marker 61.

[0184] As described above, the spectrum analyzer 1A according to the modified example is configured to include a spectrum display control section 31 that displays a spectrum display screen 50A having a graph area 52 defined by a horizontal axis having a scale of frequency and a vertical axis having a scale of signal level, and displays a graph 60 indicating the spectrum characteristics of the measured signal analyzed by the signal analysis section 15, a frequency mark 61 having a frequency indication frame 61a indicating the value of the frequency on the horizontal axis corresponding to a point on the graph 60, and a level mark 62 having a level indication frame 62a indicating the value of the signal level on the vertical axis corresponding to the point on the graph 60, on the graph area. domain 52; an operable state display control unit 32A, which, in the display of the spectrum display screen 50, displays the chart area 52 in a manner indicating an operable state in which a movement operation of a frequency marker 61 along the horizontal axis can be accepted according to an operation of selecting a chart 60 through the keyboard 20a of the operating unit 20; and a mark position setting display control unit 34A, which accepts a movement operation of the frequency marker 61 through the keyboard 20a when in an operable state, changes the position of the frequency marker 61 to a position of a frequency corresponding to the movement operation, and updates the value of the frequency indicated by the frequency indication box 61a to the value of the frequency at the changed position and displays it.

[0185] According to this configuration, the spectrum analyzer 1A according to the modified example can use the frequency marker 61, which is displayed on the spectrum display screen 50 in association with the graph 60 and indicates the position of the frequency corresponding to a point on the graph 60, as a tool for moving it to the position of the frequency requested to be changed, and can simply change the position of the frequency marker 61 to the position of the desired frequency by a simple operation of moving the position of the frequency marker 61 to the position of the desired frequency in the display of the spectrum display screen 50. As a result, when setting the position of the frequency marker 61, there is no need to perform cumbersome work such as opening other screens and operating a physical encoder, thereby significantly reducing the workload involved in setting the position of the frequency marker 61.

[0186] In the spectrum analyzer 1A according to the modification, other configurations are the same as those of the spectrum analyzer 1 according to the above embodiment, and these configurations exert the same operational effects as those of the spectrum analyzer 1 according to the above embodiment.

[0187] The frequency marker position setting method of the spectrum analyzer 1A according to the modified example is as follows: the spectrum analyzer 1A includes a spectrum display control unit 31, the spectrum display control unit 31 displays a spectrum display screen 50A having a graph area 52 defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph 60 indicating the spectrum characteristics of the measured signal analyzed by the signal analysis unit 15, a frequency marker 61 having a frequency indication frame 61a indicating a value of the frequency on the horizontal axis corresponding to a point on the graph 60, and a level marker 62 having a level indication frame 62a indicating a value of the signal level on the vertical axis corresponding to the above point in the graph area 52, the frequency marker 61 having a frequency indication frame 61a indicating a value of the frequency on the horizontal axis corresponding to a point on the graph 60, and a level marker 62 having a level indication frame 62a indicating a value of the signal level on the vertical axis corresponding to the above point in the graph area 52. The frequency marker position setting method of the spectrum analyzer 1A includes: an operable state display control step S12A, in which, in the display of the spectrum display screen 50, corresponding to the operation of selecting the graph 60 through the keyboard 20a of the operating unit 20, the graph area 52 is displayed in a manner indicating an operable state that can accept the movement operation of the frequency marker 61 along the horizontal axis; an operation acceptance step S13A, in which the movement operation of the frequency marker 61 through the keyboard 20a is accepted when the frequency marker 61 is in the operable state; and a frequency marker position setting display control step S14A, in which the position of the frequency marker 61 is changed to the position of the frequency corresponding to the movement operation, and the value of the frequency indicated by the frequency indication box 61a is updated to the value of the frequency of the changed position and displayed.

[0188] According to this structure, the frequency marker position setting method of the spectrum analyzer 1A involved in the modified example can use the frequency marker 61, which is displayed on the spectrum display screen 50 in association with the graph 60 and indicates the position of the frequency corresponding to a point on the graph 60, as a tool to move it to the position of the frequency requested to be changed, and in the display of the spectrum display screen 50, the position of the frequency marker 61 is simply changed to the position of the desired frequency (S14A) by a simple operation of moving the position of the frequency marker 61 to the position of the desired frequency (S13A). As a result, when setting the position of the frequency marker 61, it is completely unnecessary to open other screens, operate a physical encoder, and other cumbersome work, thereby greatly reducing the workload involved in setting the position of the frequency marker 61.

[0189] Industrial Applicability

[0190] As described above, the present invention has the effect of effectively implementing the frequency marker position setting with less workload without opening other screens, operating physical encoders, etc. in the display of the spectrum display screen, and is useful in spectrum analyzers and frequency marker position setting methods that analyze spectrum characteristics and display them in graphs.

[0191] Explanation of symbols

[0192] 1. 1A- spectrum analyzer, 10- frequency conversion unit, 11- mixer, 12- local signal generator, 13- filter, 14- analog-to-digital (A / D) converter, 15- signal analysis unit (signal analysis mechanism), 16- control unit, 17- frequency scanning control unit, 18- spectrum data acquisition unit, 19, 19A- display control unit, 20- operation unit, 20a- keyboard (input mechanism), 21- display unit, 31- spectrum display control unit (spectrum display control mechanism), 32- input state display control unit (input state display control mechanism), 32A- operable state display control unit (operable state display control mechanism), 33, 33A-marker position setting request receiving unit, 34, 34A-marker position setting display control unit (frequency mark position setting display control mechanism) 50, 50A-spectrum display screen, 51-chart display area, 52-chart area, 52a-frame, 53-tool area, 54-measurement status display area, 55-measurement status confirmation area, 60-chart, 61-frequency mark, 61a-frequency indication frame, 61b-frequency indication line, 62-level mark, 62a-level indication frame, 62b-level indication line, Dm-digital signal, f-frequency information, L-local signal, M-intermediate (IF) band signal, S IN -Input signal.

Claims

1. A spectrum analyzer comprising a spectrum display control mechanism (31), wherein the spectrum display control mechanism (31) displays a spectrum display screen (50) having a graph area (52) defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displays a graph (60) representing a spectrum characteristic of a measured signal analyzed by a signal analysis mechanism (15), a frequency mark (61) having a frequency indication frame (61a) indicating a value of a frequency on the horizontal axis corresponding to a point on the graph, and a level mark (62) having a level indication frame (62a) indicating a value of a signal level on the vertical axis corresponding to the point in the graph, in the graph area, wherein the spectrum analyzer has: an input-enabled state display control unit (32) for displaying the frequency indication frame in a manner indicating an input-enabled state in which a desired frequency can be input, in response to an operation of selecting the frequency mark through the input unit (20a) during display of the spectrum display screen; an operable state display control means (32A) for displaying the graph area in a manner indicating an operable state capable of accepting a movement operation of the frequency mark along the horizontal axis in response to an operation of selecting the graph through an input means (20a) during display of the spectrum display screen; and A frequency mark position setting display control mechanism (34, 34A) receives input of the desired frequency to the frequency indication frame through the input mechanism when the input state is enabled, changes the position of the frequency mark on the horizontal axis to the position of the input frequency, updates the value of the frequency indicated by the frequency indication frame to the value of the input frequency and displays it, receives the moving operation of the frequency mark through the input mechanism when the operation state is enabled, changes the position of the frequency mark to the position of the frequency corresponding to the moving operation, updates the value of the frequency indicated by the frequency indication frame to the value of the frequency at the changed position and displays it.

2. The spectrum analyzer according to claim 1, characterized in that: The frequency mark position setting display control mechanism changes the position of the level mark on the vertical axis to the position of the signal level corresponding to the updated frequency in response to the change in the position of the frequency mark, and updates the value of the signal level indicated by the level indicator box to a value corresponding to the changed position of the signal level and displays it.

3. The spectrum analyzer according to claim 1, characterized in that: The frequency mark position setting display control mechanism further displays in the graph area a frequency indication line (61b) extending from the frequency position indicated by the frequency indication frame in parallel with the vertical axis and a level indication line (62b) extending from the signal level position indicated by the level indication frame along the horizontal axis.

4. The spectrum analyzer according to claim 1, characterized in that: The signal analysis unit analyzes the spectrum characteristics of a plurality of radio frequency signals in different frequency ranges in the millimeter wave band as the measured signal, The spectrum display control unit displays the graph indicating the spectrum characteristics of the radio frequency signal selected from among the plurality of radio frequency signals.

5. A method for setting a frequency marker position of a spectrum analyzer, the spectrum analyzer having a spectrum display control mechanism (31), the spectrum display control mechanism (31) displaying a spectrum display screen (50) having a graph area (52) defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displaying a graph (60) representing a spectrum characteristic of a measured signal analyzed by a signal analysis mechanism (15), a frequency marker (61) having a frequency indication frame (61a) indicating a frequency value on the horizontal axis corresponding to a point on the graph, and a level marker (62) having a level indication frame (62a) indicating a signal level value on the vertical axis corresponding to the point in the graph in the graph area, the method for setting a frequency marker position of the spectrum analyzer comprising: an input-enabled state display control step (S12), in which, in the display of the spectrum display screen, the frequency indication frame is displayed in a manner indicating an input-enabled state in which a desired frequency can be input, according to an operation of selecting the frequency mark through the input means (20a); An input accepting step (S13) of accepting an input of the desired frequency into the frequency indication frame through the input mechanism when the input is in the input enabled state; and The frequency mark position setting display control step (S14) changes the position of the frequency mark on the horizontal axis to the position of the input frequency, and updates the value of the frequency indicated by the frequency indication frame to the value of the input frequency and displays it.

6. A method for setting a frequency marker position of a spectrum analyzer, the spectrum analyzer comprising a spectrum display control mechanism (31), the spectrum display control mechanism (31) displaying a spectrum display screen (50A) having a graph area (52) defined by a horizontal axis having a frequency scale and a vertical axis having a signal level scale, and displaying a graph (60) representing a spectrum characteristic of a measured signal analyzed by a signal analysis mechanism (15), a frequency marker (61) having a frequency indication frame (61a) indicating a frequency value on the horizontal axis corresponding to a point on the graph, and a level marker (62) having a level indication frame (62a) indicating a signal level value on the vertical axis corresponding to the point in the graph in the graph area, the method for setting a frequency marker position of the spectrum analyzer comprising: an operable state display control step (S12A) of displaying the spectrum display screen, in response to an operation of selecting the graph through an input device (20a), displaying the graph area in a manner indicating an operable state capable of accepting a movement operation of the frequency mark along the horizontal axis; an operation accepting step (S13A) of accepting a moving operation of the frequency mark through the input mechanism when the frequency mark is in the operable state; and The frequency mark position setting display control step (S14A) changes the position of the frequency mark to the position of the frequency corresponding to the moving operation, and updates the value of the frequency indicated by the frequency indication frame to the value of the frequency at the changed position and displays it.

7. The method for setting the frequency marker position of a spectrum analyzer according to claim 5, characterized in that: Also includes: Step (S15), corresponding to the change in the position of the frequency mark, changes the position of the level mark on the vertical axis to the position of the signal level corresponding to the updated frequency, and updates the value of the signal level indicated by the level indicator box to a value corresponding to the changed position of the signal level and displays it.

8. The method for setting the frequency marker position of a spectrum analyzer according to claim 6, characterized in that: Also includes: Step (S15A) corresponds to the change in the position of the frequency mark, and changes the position of the level mark on the vertical axis to the position of the signal level corresponding to the updated frequency, and updates the value of the signal level indicated by the level indicator box to a value corresponding to the changed position of the signal level and displays it.

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