First measurement device, second measurement device and measurement system, as well as measurement method

Abstract

To synchronize measurement devices themselves without inputting the same signal to each of a plurality of measurement devices.SOLUTION: A first measurement device 1 of a measurement system 100 is provided with one or more input terminals (1A and 1B), and is configured to generate a synchronization signal Ss1 on the basis of timing at which a characteristic point of a waveform of an input signal to be input to any of the input terminals is detected, and the first measurement device 1 is further provided with an output terminal 1C for outputting the synchronization signal Ss1 to be generated, and configured to compute a measured quantity of input signals of the one or more input terminals (1A and 1B) at measurement intervals to be decided by the synchronization signal Ss1. One or more second measurement devices 2 are provided with one or more input terminals (2A and 2B), and provided with a synchronization terminal 2C for receiving the synchronization signal Ss1 to be output from an output terminal 1C of the first measurement device 1, and are configured to compute a measured quantity of an input signal of the one or more input terminals (2A and 2B) at measurement intervals to be decided by the synchronization signal Ss1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a first measuring device, a second measuring device and a measuring system for measuring an input signal, and a measuring method. [Background technology]

[0002] Patent Document 1 discloses a power meter that, when there are multiple channels set for AC use, synchronizes with the zero crossing point in the line voltage of the channel with the smallest number. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-197223 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the measurement device described above, it is possible to synchronize multiple channels that are configured to be input to each other. However, in order to synchronize multiple measurement devices, the same signal must be input to each measurement device so that feature points such as zero crossing points are detected at the same timing in each measurement device.

[0005] The present invention has been made in view of the above-mentioned problems, and has as its object to synchronize a plurality of measuring devices without inputting the same signal to each of the measuring devices. [Means for solving the problem]

[0006] According to an aspect of the present invention, a measurement system includes a plurality of measurement devices that measure input signals. A first measurement device among the plurality of measurement devices includes one or more input terminals for receiving the input signal, a detection unit for detecting a feature point of the waveform of the input signal input to the input terminal, and a generation unit for generating a synchronization signal for synchronizing the operation of each of the measurement devices based on the timing at which the detection unit detects the feature point. The first measurement device further includes a first calculation unit for calculating a measurement amount of the input signal input to the one or more input terminals at a measurement interval determined by the synchronization signal, and an output terminal for outputting the synchronization signal generated by the generation unit. One or more second measurement devices include one or more input terminals for receiving the input signal, a synchronization terminal for receiving the synchronization signal output from an output terminal of the first measurement device, and a second calculation unit for calculating a measurement amount of the input signal input to the one or more input terminals at the measurement interval determined by the synchronization signal. Effect of the Invention

[0007] According to this aspect, since the synchronization signal generated by the first measuring device is transmitted to the second measuring device, it becomes possible to synchronize the first measuring device and the second measuring device with each other. Therefore, it is not necessary to input to the second measuring device the same signal as that input to the detection unit of the first measuring device so that the second measuring device detects the feature point at the same timing as that at which the feature point is detected by the detection unit of the first measuring device.

[0008] Therefore, the measurement devices can be synchronized with each other without inputting the same signal to each of the measurement devices. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a basic configuration of a measurement system according to the first embodiment. [Diagram 2] FIG. 2 is a block diagram illustrating the details of a partial configuration of each measurement device constituting the measurement system. [Figure 3A]FIG. 3A is a diagram for explaining an example of a method for calculating a measurement amount of a signal input to each measurement device in accordance with a synchronization signal according to the first embodiment. [Figure 3B] FIG. 3B is a diagram for explaining a method for calculating a measurement amount of a signal input to each measuring device in accordance with a synchronization signal in a comparative example. [Figure 4] FIG. 4 is a flowchart showing an example of a measurement method using the measurement system. [Diagram 5] FIG. 5 is a diagram showing the configuration of a measurement system according to the second embodiment. [Figure 6] FIG. 6 is a diagram showing the configuration of a measurement system according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, the same reference numerals are used throughout to refer to the same or equivalent elements.

[0011] First embodiment FIG. 1 is a diagram showing the configuration of a measurement system 100 according to the first embodiment.

[0012] The measurement system 100 is a system for measuring multiple measurement points, and for example, measures input / output signals of a measurement target having one or more input ports and one or more output ports. Examples of the measurement target include a multiple-input / single-output, single-input / multiple-output, or multiple-input / multiple-output power converter or repeater.

[0013] As an example, the measurement system 100 of the first embodiment measures an electrical signal transmitted to a one-input, one-output converter. The measurement system 100 includes multiple measurement devices 1 and 2. The measurement device 1 is a first measurement device that measures an input signal input to one or more channels, and the measurement device 2 is a second measurement device that measures an input signal input to one or more channels.

[0014] Each of the measuring devices 1 and 2 is a computer that includes a processor, a read only memory (ROM), a random access memory (RAM), an input / output interface, and a bus that interconnects these.

[0015] Each of the measuring devices 1 and 2 in the first embodiment is realized by a power meter that measures the power input to the first channel CH1. The measuring device 1 and the measuring device 2 are connected wirelessly or by wire, for example, via a transmission cable such as a coaxial cable or an optical cable.

[0016] The measurement device 1 measures an input signal input to an input terminal 1A of the first channel CH1 and an input signal input to an input terminal 1B. The measurement device 1 also outputs a synchronization signal to an output terminal 1C for synchronizing the measurement operations of the measurement devices 1 and 2.

[0017] In the first embodiment, the input terminal unit 1A has positive and negative voltage input terminals and is connected to the input terminal unit (input port) of the converter. An AC voltage signal is applied as an input signal to the input terminal unit 1A by the input terminal unit of the converter.

[0018] The input terminal unit 1B has positive and negative current input terminals and is connected to the output terminal unit (output port) of the converter. An AC current signal is supplied to the input terminal unit 1B from the output terminal unit of the converter as an input signal.

[0019] Furthermore, the output terminal 1C is a terminal for transmitting a synchronization signal to the measurement device 2, and in the first embodiment, is connected to a synchronization terminal 2C of the measurement device 2 via an optical cable.

[0020] The measurement device 1 of the first embodiment includes a processing unit 10, a storage unit 20, an operation unit 30, a display unit 40, and a communication unit 50.

[0021] In the measurement device 1, the processing unit 10 receives a voltage signal input to the input terminal unit 1A and a current signal input to the input terminal unit 1B, and generates a synchronization signal using either the received voltage signal or current signal.

[0022] The voltage signal is a detection signal proportional to the magnitude of the voltage of the object to be measured, such as the output signal of a voltage sensor, etc. The current signal is a detection signal proportional to the magnitude of the current flowing through the object to be measured, such as the output signal of a current sensor, etc.

[0023] The processing unit 10 measures the voltage signal and the current signal based on the generated synchronization signal, and further measures the power input to the first channel CH1 using the measured amounts of the voltage signal and the current signal.

[0024] Moreover, the processing unit 10 outputs the generated synchronization signal to the output terminal 1C. In addition to the synchronization signal, the processing unit 10 may output a measured amount of power of the first channel CH1 to the output terminal 1C in order to calculate the power efficiency of the converter.

[0025] The storage unit 20 stores the measured quantities of the voltage, current, and power in the first channel CH1 obtained by the processing unit 10. The storage unit 20 stores a program for controlling the operation of the measurement device 1. The storage unit 20 is a computer-readable recording medium on which the program is recorded, and is composed of a ROM and a RAM.

[0026] The operation unit 30 is composed of a plurality of push buttons provided around the display screen, a touch sensor arranged within the display screen, or a keyboard and a mouse, etc. The operation unit 30 receives an input operation from a user and generates an operation signal indicating the content of the received input operation.

[0027] Examples of input operations include an operation of pressing the power button, an operation of setting measurement conditions and display conditions, an operation of setting the type of input signal (AC or DC), an operation of instructing the end of measurement processing, etc. The operation of setting measurement conditions includes an operation of setting an input terminal unit for generating a synchronization signal, i.e., a synchronization source.

[0028] The display unit 40 displays, for example, the measurement results or measurement conditions by the processing unit 10. The display unit 40 is configured, for example, by a touch panel so that the user can visually recognize information and can operate it. Alternatively, the display unit 40 may be configured by a liquid crystal display or an LED display.

[0029] The communication unit 50 communicates wirelessly or wired between the measurement device 1 itself and an external device or the measurement device 2. For example, the communication unit 50 transmits the measurement results and measurement conditions by the processing unit 10 to the external device. Examples of the external device include a personal computer, a mobile terminal such as a smartphone or a tablet, and a measurement device separate from the measurement devices 1 and 2.

[0030] Next, the configuration of the measurement device 2 will be described.

[0031] The measurement device 2 acquires, from its own synchronization terminal 2C, a synchronization signal input through the output terminal 1C of the measurement device 1. Based on the acquired synchronization signal, the measurement device 2 measures an input signal input to the input terminal unit 2A of the first channel CH1 and an input signal input to the input terminal unit 2B.

[0032] In the first embodiment, the input terminal unit 2A has positive and negative voltage input terminals and is connected to the output unit (output port) of the converter. An AC voltage signal is applied as an input signal to the input terminal unit 2A by the output unit of the converter.

[0033] The input terminal section 2B has positive and negative current input terminals and is connected to the output section of the converter. An AC current signal is supplied as an input signal from the output section of the converter to the input terminal section 2B.

[0034] Furthermore, the synchronization terminal 2C is a terminal for receiving a synchronization signal from the measurement device 1, and is connected to the output terminal 1C of the measurement device 1 via an optical cable.

[0035] The measurement device 2 of the first embodiment includes a processing unit 10, a storage unit 20, an operation unit 30, a display unit 40, and a communication unit 50, similar to the measurement device 1 of the first embodiment.

[0036] In addition to the above functions, the processing unit 10 acquires a synchronization signal input to the synchronization terminal 2C from the measurement device 1. Based on the acquired synchronization signal, the processing unit 10 measures a voltage signal input to the input terminal unit 2A and a current signal input to the input terminal unit 2B. The processing unit 10 measures the power input to the first channel CH1 using the measured amounts of the voltage signal and the current signal.

[0037] Furthermore, the processing unit 10 obtains the measured amount of the measured power as a second power value, and obtains the measured amount of the input power in the first channel CH1 of the measurement device 1 from the synchronization terminal 2C as a first power value. Then, the processing unit 10 calculates the power efficiency of the converter by dividing the second power value by the first power value.

[0038] The storage unit 20, operation unit 30, display unit 40, and communication unit 50 have the same configuration as those of the measurement device 1, and therefore their explanation will be omitted here.

[0039] Next, the detailed configuration of each of the measuring devices 1 and 2 will be described with reference to FIG.

[0040] Fig. 2 is a block diagram showing the main functional configuration of each of the measurement devices 1 and 2 in the first embodiment. For convenience, the storage unit 20, the operation unit 30, and the display unit 40 are omitted in Fig. 2, and the functional configuration of each processing unit 10 of the measurement devices 1 and 2 is shown.

[0041] The processing unit 10A of the measuring device 1 and the processing unit 10B of the measuring device 2 each realize a part of the functions of the processing unit 10 shown in FIG.

[0042] First, there will be described the processing unit 10A of the measurement device 1. The processing unit 10A includes a voltage measurement unit 11, a current measurement unit 12, a switch 13, a feature point detection unit 14, a synchronization signal processing unit 15, and a calculation unit 16. The calculation unit 16 includes a voltage calculation unit 161, a current calculation unit 162, and a power calculation unit 163.

[0043] The voltage measurement unit 11 measures a voltage signal input to the input terminal unit 1 A. The voltage measurement unit 11 in the first embodiment is a circuit that converts a voltage signal into a signal level within a predetermined measurement range, and is composed of an amplifier that amplifies the input signal, and an A / D converter that converts the output signal of the amplifier into a digital signal.

[0044] The current measuring unit 12 measures a current signal input to the input terminal unit 1 B. The current measuring unit 12 in the first embodiment is a circuit that converts the current signal into a signal level within a predetermined measurement range, and is configured with an amplifier that amplifies the input signal, and an A / D converter that converts the output signal of the amplifier into a digital signal.

[0045] Switch 13 is a signal selector that selects one of the waveform signals used to generate a synchronization signal. Switch 13 outputs an AC signal designated by operation unit 30 shown in FIG. 1 from the output signal of voltage measurement unit 11 used as a voltage signal input to input terminal unit 1A and the output signal of current measurement unit 12 used as a current signal input to input terminal unit 1B.

[0046] The switch 13 in the first embodiment outputs the output signal of the voltage measurement unit 11 to the feature point detection unit 14 in accordance with an operation signal from the operation unit 30. That is, the switch 13 selects one of the multiple input signals input to the measurement device 1 as a synchronization source.

[0047] The feature point detection unit 14 functions as a detection unit that detects feature points of the waveform shown in the input signal. Examples of feature points of the waveform include zero crossing points of an AC waveform, points showing the maximum or minimum value of the waveform, or points showing the average or effective value of the waveform.

[0048] The feature point detection unit 14 in the first embodiment is configured by, for example, a zero-crossing point detection circuit. The feature point detection unit 14 detects zero-crossing points of the voltage signal output from the switch 13.

[0049] The feature point detection unit 14 also functions as a generation unit that generates a synchronization signal for synchronizing the measurement operations of the measurement devices 1 and 2 based on the timing at which the feature points are detected. For example, a pulse signal is used as the generated synchronization signal. The feature point detection unit 14 outputs the generated synchronization signal to the synchronization signal processing unit 15.

[0050] When the synchronization signal processing unit 15 acquires the synchronization signal generated by the feature point detection unit 14, it transmits the synchronization signal from the output terminal 1C via the optical cable to the measurement device 2. When there is information to be shared in order to improve the accuracy of the power calculation or the high frequency calculation, the synchronization signal processing unit 15 may transmit the information to be shared together with the synchronization signal constituted by a pulse signal.

[0051] Furthermore, the synchronization signal processing unit 15 can transmit measurement results obtained by the calculation unit 16 in addition to the synchronization signal, and can receive measurement results from the measurement device 2. In this way, the synchronization signal processing unit 15 has a function of communicating with the synchronization signal processing unit 15 of the measurement device 2 using an arbitrary protocol.

[0052] When communication is performed between the synchronization signal processing units 15 of the measurement devices 1 and 2, for example, a communication method is adopted in which the measurement device 1 accesses a specific memory area in the measurement device 2. In the first embodiment, a zero-crossing point is notified to a specific memory area in the synchronization signal processing unit 15 of the measurement device 2 by write access by the synchronization signal processing unit 15 of the measurement device 1.

[0053] Furthermore, the synchronization signal processing unit 15 supplies the synchronization signal generated by the feature point detection unit 14 to each of the voltage calculation unit 161 and the current calculation unit 162.

[0054] The calculation unit 16 functions as a first calculation unit that calculates a measurement amount of an input signal input to at least one of the input terminal units 1A and 1B at a measurement interval determined by a synchronization signal. Examples of the measurement amount include a voltage value, a current value, and a power value.

[0055] Voltage calculation unit 161 determines a measurement interval according to a synchronization signal supplied from synchronization signal processing unit 15, and sequentially calculates the voltage value of the voltage signal input to input terminal unit 1A at each measurement interval. Examples of the calculated voltage value include an average value and an effective value.

[0056] In the first embodiment, the voltage calculation unit 161 calculates the effective value of the voltage signal according to the measurement interval determined by the synchronization signal from the synchronization signal processing unit 15. The voltage calculation unit 161 outputs the calculated effective value of the voltage signal to the power calculation unit 163 as a measurement amount.

[0057] Similar to the voltage calculation unit 161, the current calculation unit 162 determines a measurement interval according to a synchronization signal, and sequentially calculates the current value of the current signal input to the input terminal unit 1B at each measurement interval. The calculated current value may be an average value or an effective value.

[0058] In the first embodiment, the current calculation unit 162 calculates the effective value of the current signal according to the measurement interval determined by the synchronization signal. The current calculation unit 162 outputs the calculated effective value of the current signal to the power calculation unit 163 as a measured amount.

[0059] The power calculation unit 163 multiplies the effective value of the voltage signal output from the voltage calculation unit 161 by the effective value of the current signal output from the current calculation unit 162 to calculate a first power value of the input power of the first channel CH1.

[0060] Next, a description will be given of an example of the configuration of processing unit 10B of measuring device 2. In this example, a signal input to synchronization terminal 2C is selected as a synchronization signal for measuring device 2 by operation unit 30 of measuring device 2, whereby functions of switch 13 and feature point detection unit 14 are disabled.

[0061] Similar to the processing unit 10A, the processing unit 10B includes a synchronization signal processing unit 15 and a calculation unit 16. The calculation unit 16 includes a voltage calculation unit 161, a current calculation unit 162, and a power calculation unit 163.

[0062] In addition to the functions described above, synchronization signal processing unit 15 receives a synchronization signal transmitted from measuring device 1 through synchronization terminal 2C in accordance with an operation signal from operation unit 30 of measuring device 2. Synchronization signal processing unit 15 supplies the received synchronization signal to each of voltage calculation unit 161 and current calculation unit 162.

[0063] The calculation unit 16 functions as a second calculation unit that calculates a measurement quantity of an input signal input to at least one of the input terminal units 2A and 2B at a measurement interval determined by a synchronization signal from the synchronization terminal 2C. Examples of the measurement quantity include a voltage value, a current value, and a power value.

[0064] Voltage calculation section 161, current calculation section 162, and power calculation section 163 have the same configuration as in measurement device 1, so that duplicated descriptions thereof will be omitted here.

[0065] Similar to the measuring device 1, the power calculation unit 163 multiplies the effective value of the voltage signal output from the voltage calculation unit 161 by the effective value of the current signal output from the current calculation unit 162 to calculate a second power value of the input power of the first channel CH1.

[0066] After calculating the second power value, the power calculation unit 163 may obtain a first power value of the input power of the first channel CH1 in the measurement device 1 from the synchronization signal processing unit 15, and divide the second power value by the first power value to calculate the power efficiency.

[0067] At this time, in the measurement device 1, the synchronization signal processing unit 15 acquires the first power value from the power calculation unit 163 and transmits the first power value together with the synchronization signal to the measurement device 2. Then, in the measurement device 2, the synchronization signal processing unit 15 outputs the first power value received together with the synchronization signal to the power calculation unit 163.

[0068] Although the power calculation unit 163 of the measuring device 2 calculates the power efficiency of the converter to be measured, the power calculation unit 163 of the measuring device 1 may instead calculate the power efficiency. In this case, the first power value is transmitted from the synchronization signal processing unit 15 of the measuring device 2 to the synchronization signal processing unit 15 of the measuring device 1.

[0069] Next, the synchronization process performed by the measurement devices 1 and 2 in the first embodiment will be described with reference to FIGS. 3A and 3B.

[0070] Fig. 3A is a time chart for explaining an example of a method for calculating a measurement amount based on the synchronization signal Ss1 of the first embodiment generated by the feature point detection unit 14. Fig. 3B is a time chart for explaining, as a comparative example, a method for calculating a measurement amount based on the synchronization signal Ss9 generated independently of the input signal.

[0071] 3A and 3B show signal processing in a state in which the input terminal portion of the converter to be measured is connected to the input terminal portion 1A of the measuring device 1, and the output terminal portion of the converter is connected to the input terminal portion 2A of the measuring device 2.

[0072] 3A and 3B respectively show the AC waveform of a voltage signal input to the input terminal unit 1A of the measuring device 1 and the DC waveform of a voltage signal input to the input terminal unit 2A of the measuring device 2, where the vertical axis indicates the magnitude of the voltage for each voltage signal and the horizontal axis indicates the passage of time. For convenience, an example will be described here in which a voltage signal is input to each of the input terminal units 1A and 2A immediately after the calculation timing Tc0.

[0073] 3A shows a synchronization signal Ss1 transmitted from output terminal 1C of measuring device 1 to synchronization terminal 2C of measuring device 2. This synchronization signal Ss1 is a pulse signal in which a pulse is generated at the timing when synchronization signal processing unit 15 detects the zero-crossing point of the voltage signal input to input terminal unit 1A.

[0074] The update period Pd between the calculation timings Tc0 to Tc1 and between the calculation timings Tc1 to Tc2 is a period for updating the measurement amount of the input signal, and is set to, for example, 50 ms. The measurement interval indicating the calculation period is the period from the zero cross point immediately before the previous calculation timing Tc0 to the zero cross point immediately before the current calculation timing Tc1.

[0075] As shown in FIG. 3A, in accordance with a synchronization signal Ss1 output to output terminal 1C of measuring device 1, voltage calculation units 161 of both measuring devices 1 and 2 calculate the voltage values ​​of the voltage signals input to input terminal units 1A and 2A, respectively.

[0076] Specifically, each voltage calculation unit 161 calculates, for example, an effective value as a voltage value for each waveform W1 to W6 of one cycle of the input voltage signal, and performs statistical processing on the calculated effective values ​​at each calculation timing Tc0 to Tc2 to calculate a measurement amount. The measurement amount referred to here may be a representative value such as the average or median of the effective values.

[0077] Similarly, the measured amount of the current signal input to input terminal 1B of measuring device 1 and the measured amount of the current signal input to input terminal 2B of measuring device 2 are calculated in accordance with synchronization signal Ss1. Then, power calculation unit 163 of measuring device 1 calculates a power value using the measured amounts of input terminals 1A and 1B, and power calculation unit 163 of measuring device 2 calculates a power value using the measured amounts of input terminals 2A and 2B.

[0078] At calculation timing Tc1, the measured quantities of two waveforms W1 and W2 within the measurement interval determined by synchronization signal Ss1 are each calculated, and at calculation timing Tc2, the measured quantities of three waveforms W3 to W5 within the measurement interval determined by synchronization signal Ss1 are each calculated.

[0079] In this way, by performing power calculations on input signals input to different measuring devices 1 and 2 according to a single synchronization signal Ss1, the calculation intervals for both the input and output of the object to be measured are aligned and power calculations are performed, so that the power efficiency of the object to be measured can be accurately determined.

[0080] 3B, the synchronization signal Ss9 is generated independently of the input signal, and therefore the zero-crossing point is not detected in the waveform of the voltage signal input to the input terminal 2A, so that the section from the previous calculation timing Tc0 to Tc1, i.e., the update period Pd itself, becomes the measurement interval.

[0081] As a result, the measurement interval of the voltage signal input to input terminal 1A of measuring device 1 and the measurement interval of the voltage signal input to input terminal 2A of measuring device 2 are shifted from each other. In this way, the power efficiency is calculated using two power values ​​calculated at different measurement intervals, which reduces the measurement accuracy of the power efficiency.

[0082] In contrast, in the first embodiment, the measurement interval is determined using the synchronization signal Ss1 in both the measurement devices 1 and 2, so that errors in the measurement amount can be reduced compared to the case where the synchronization signal Ss9 in the comparative example is used.

[0083] Next, the operation of the measurement system 100 in the first embodiment will be described with reference to FIG.

[0084] FIG. 4 is a flowchart showing an example of a processing procedure of a measurement method performed by the measurement system 100.

[0085] In this example, an input terminal section 1A of the measurement device 1 is connected to an input terminal section of a converter to be measured, and an input terminal section 2A of the measurement device 2 is connected to an output terminal section of the converter.

[0086] Furthermore, an output terminal of a current sensor that detects a current flowing through a power cable connected to the positive terminal of the input terminal 1A is connected to the input terminal 1B of the measuring device 1, and an output terminal of a current sensor that detects a current flowing through a power cable connected to the positive terminal of the input terminal 2A is connected to the input terminal 2B. As the current sensor, for example, a sensor that clamps the power cable and detects the current flowing through the power cable in a non-contact manner is used.

[0087] In step S1, a voltage signal generated between the positive and negative terminals constituting the input terminal section of the converter is input to input terminal section 1A of measuring device 1, and a current signal flowing through the input terminal section of the converter is input to input terminal section 1B. Furthermore, a voltage signal generated between the positive and negative terminals constituting the output terminal section of the converter is input to input terminal section 2A of measuring device 2, and a current signal flowing through the output terminal section of the converter is input to input terminal section 2B.

[0088] In step S2, the measurement device 1 detects feature points in the waveform of the input signal based on the waveform signal input to the input terminal unit 1 A. The waveform signal includes, for example, an AC signal that oscillates around zero, and a signal in which an AC signal is superimposed on a DC signal.

[0089] Specifically, the measurement device 1 in the first embodiment uses an AC signal input to the input terminal unit 1A to detect zero crossing points in the waveform of the AC signal.

[0090] In step S3, the measurement device 1 generates a synchronization signal Ss1 in accordance with the timing at which the characteristic point is detected.

[0091] The processing of steps S2 and S3 above corresponds to a generation step of generating a synchronization signal Ss1 that synchronizes the operations of each of the measurement devices 1 and 2 based on the timing at which a feature point of the waveform of an input signal input to the measurement device 1 is detected.

[0092] In step S4, the measurement device 1 supplies the generated synchronization signal Ss1 through the output terminal 1C to the synchronization terminal 2C of the measurement device 2. The process of step S4 corresponds to an output step of outputting the synchronization signal Ss1.

[0093] In step S5, the measurement device 1 measures the signals input to the input terminal units 1A and 1B in accordance with the generated synchronization signal Ss1.

[0094] Specifically, the measurement device 1 in the first embodiment calculates, in synchronization with the synchronization signal Ss1, a measured amount of a voltage signal input to the input terminal unit 1A and a measured amount of a current signal input to the input terminal unit 1B. Furthermore, the measurement device 1 calculates a first power value as a new measured amount using the measured amounts of the voltage signal and the current signal.

[0095] That is, the process of step S5 corresponds to a first calculation step of calculating a measurement amount of one or more input signals input to the measurement device 1 at a measurement interval determined by the synchronization signal Ss1.

[0096] In step S6, the measurement device 2 receives the synchronization signal Ss1 supplied from the measurement device 1 to the synchronization terminal 2C, and measures the signals input to the input terminal units 2A and 2B in accordance with the synchronization signal Ss1.

[0097] The processing of step S6 corresponds to a receiving step of receiving a synchronization signal Ss1 output from the measuring device 1 to at least one measuring device 2, and a second calculation step of calculating the measurement amount of one or more input signals input to the at least one measuring device 2 at a measurement interval determined by the synchronization signal Ss1.

[0098] Specifically, the measurement device 2 in the first embodiment calculates, in synchronization with the synchronization signal Ss1, a measured amount of a voltage signal input to the input terminal unit 2A and a measured amount of a current signal input to the input terminal unit 2B. Furthermore, the measurement device 2 calculates a second power value as a new measured amount using the measured amounts of the voltage signal and the current signal.

[0099] In step S7, the measuring devices 1 and 2 each output the measurement results, which may include, for example, a voltage value, a current value, a power value, and the power efficiency of a second power value relative to a first power value.

[0100] For example, the measurement device 1 in the first embodiment displays the voltage value and current value, the first power value, or the power efficiency of the input terminal units 1A and 1B, records them in an external or internal memory, or transmits them to an external device. The measurement device 2 also outputs the measurement results in a similar manner.

[0101] When the process of step S7 ends, a series of processes for the measurement method in the first embodiment ends.

[0102] Next, the effects of the first embodiment will be described.

[0103] In the first embodiment, the measurement system 100 comprises a plurality of measurement devices 1 and 2 for measuring an input signal. The measurement device 1 is a first measurement device and the measurement device 2 is a second measurement device.

[0104] The above-mentioned measuring device 1 has input terminal units 1A and 2B each composed of one or more input terminals for receiving an input signal. The measuring device 1 further includes a feature point detection unit 14 which functions as a detection unit that detects feature points of the waveform of an input signal input to one input terminal unit 1A, and the feature point detection unit 14 also functions as a generation unit that generates a synchronization signal Ss1 for synchronizing the operations of the measuring devices 1 and 2 based on the timing at which the feature points are detected.

[0105] The measurement device 1 includes a calculation unit 16 as a first calculation unit that calculates a measurement amount of an input signal input to one or more input terminals at a measurement interval determined by the synchronization signal Ss1. The measurement device 1 further includes an output terminal 1C for outputting the synchronization signal Ss1 generated by the feature point detection unit 14.

[0106] The measuring device 2 has input terminal units 2A and 2B each composed of one or more input terminals for receiving an input signal, and a synchronization terminal 2C for receiving a synchronization signal Ss1 output from an output terminal 1C of the measuring device 1. The measuring device 2 further includes a calculation unit 16 as a second calculation unit that calculates a measurement amount of an input signal input to one or more input terminals at a measurement interval determined by the synchronization signal Ss1.

[0107] Moreover, the measurement method in the first embodiment is executed by a plurality of measurement devices 1 and 2 that measure one or a plurality of input signals. This measurement method includes a generation step (S2, S3) of generating a synchronization signal Ss1 that synchronizes the operations of the measurement devices 1 and 2 based on the timing at which a feature point of the waveform of one input signal input to the measurement device 1 is detected.

[0108] The measurement method further includes a first calculation step (S5) of calculating a measurement quantity of one or more input signals input to the measurement device 1 at a measurement interval determined by the synchronization signal Ss1, and an output step (S4) of outputting the synchronization signal Ss1.

[0109] The measurement method includes a receiving step of receiving a synchronization signal Ss1 output from the measurement device 1 to at least one measurement device 2, and a second calculation step of calculating a measurement amount of one or more input signals input to the at least one measurement device 2 at a measurement interval determined by the synchronization signal Ss1.

[0110] According to the configurations of measurement system 100 and measurement method described above, since the synchronization signal Ss1 generated in measurement device 1 is transmitted to measurement device 2, it becomes possible to synchronize measurement device 1 and measurement device 2. Therefore, it is not necessary to input to measurement device 2 the same signal as the synchronization source input to feature point detection unit 14 so that feature points are detected in measurement device 2 at the same timing as feature points are detected by feature point detection unit 14 of measurement device 1.

[0111] Therefore, the measurement devices 1 and 2 can be synchronized with each other without inputting the same signal to each of the measurement devices 1 and 2.

[0112] In the first embodiment, the input signal is a voltage signal or a current signal, and the measured quantity is an effective value or an average value of the voltage signal or the current signal.

[0113] According to this configuration, a plurality of measurement quantities of a measurement object to which a voltage signal or a current signal is input or output can be calculated with high accuracy by aligning the measurement intervals.

[0114] Moreover, in the first embodiment, the measuring device 1 is provided with input terminal units 1A and 1B each composed of a plurality of input terminals, and the measuring device 2 is provided with input terminal units 2A and 2B each composed of a plurality of input terminals. The input terminal units 1A and 2A are composed of voltage input terminals for receiving voltage signals, and the input terminal units 1B and 2B are composed of current input terminals for receiving current signals.

[0115] Then, at the same measurement intervals, the voltage calculation unit 161 of each calculation unit 16 of the measuring devices 1 and 2 calculates the voltage value of the voltage signal as the measured amount, and the current calculation unit 162 of each calculation unit 16 calculates the current value of the current signal as the measured amount. At this time, the voltage calculation unit 161 and the current calculation unit 162 of the measuring device 1 function as a first calculation unit, and the voltage calculation unit 161 and the current calculation unit 162 of the measuring device 2 function as a second calculation unit.

[0116] With this configuration, all the measured values ​​of voltage and current are calculated at the same timing and at the same measurement interval, so that it is possible to accurately estimate the state of the load of the measurement target by comparing or calculating each of the measured values. For example, since all the measured values ​​are calculated at the same measurement interval, it is possible to accurately estimate the numerical value of the power or power efficiency of the measurement target.

[0117] In the first embodiment, the power calculation unit 163 of the measuring device 1 functions as a first calculation unit, and the power calculation unit 163 of the measuring device 2 functions as a second calculation unit. Each of the power calculation units 163 calculates a power value based on the calculated voltage value and current value.

[0118] According to this configuration, when measurement device 1 measures the input power of an object to be measured and measurement device 2 measures the output power of the same object to be measured, it is possible to accurately grasp the relationship between the input and output of the object to be measured.

[0119] In the first embodiment, the power calculation unit 163 of the measurement device 1 calculates a first power value based on the calculated voltage value and current value, and the power calculation unit 163 of the measurement device 2 calculates a second power value based on the calculated voltage value and current value. Either of the power calculation units 163 then calculates the power efficiency based on the first power value and the second power value.

[0120] According to this configuration, all measurement amounts used to calculate the power value are calculated at the same measurement interval, so that measurement errors in the power efficiency can be reduced.

[0121] In the first embodiment, one of the first power value and the second power value is an input power of the power electronics device, and the other is an output power of the power electronics device.

[0122] According to this configuration, since the measurement target is a power conversion device, the power efficiency of the power conversion device can be measured with high accuracy.

[0123] Furthermore, in the first embodiment, the measurement device 1 is connected to a measurement device 2 that calculates a measurement amount of an input signal input to input terminals 2A and 2B at a measurement interval determined by a synchronization signal Ss1.

[0124] As described above, the measurement device 1 includes input terminal units 1A and 1B, a feature point detection unit 14 serving as a detection unit and a generation unit, a calculation unit 16 serving as a first calculation unit, and an output terminal 1C.

[0125] According to this configuration, the measurement device 1 supplies a synchronization signal Ss1 generated by itself to the measurement device 2. This enables the measurement device 2 to calculate the measurement amount at a measurement interval determined by the synchronization signal Ss1 generated by the measurement device 1. This allows the measurement devices 1 and 2 to be synchronized with each other without inputting the same signal to each of the multiple measurement devices 1 and 2.

[0126] In the first embodiment, the measurement device 2 is connected to the measurement device 1 including a calculation unit 16 as a first calculation unit. The measurement device 1 detects feature points of the waveform of an input signal input to an input terminal unit 1A, and generates a synchronization signal Ss1 based on the detected timing.

[0127] As described above, the measurement device 2 includes the input terminal units 2A and 2B, the synchronization terminal 2C, and the calculation unit 16 serving as a second calculation unit.

[0128] According to this configuration, the measurement device 2 calculates the measurement amount of the input signal input to the input terminal units 2A and 2B based on the synchronization signal Ss1 generated by the measurement device 1. This makes it possible to synchronize the measurement devices 1 and 2 with each other without inputting the same signal to each of the multiple measurement devices 1 and 2.

[0129] Second Embodiment Next, a measurement system according to a second embodiment will be described with reference to Fig. 5. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0130] 5 is a block diagram showing the configuration of a measurement system 200 according to the second embodiment. The measurement system 200 includes measurement devices 1 and 2, and an external device 3.

[0131] The external device 3 includes an operation unit 30 that accepts input operations from a user and a display unit 40, and is connected to the measurement device 1 or 2 via a wired or wireless connection. The external device 3 controls the operations of the measurement devices 1 and 2 in accordance with the input operations accepted by the operation unit 30.

[0132] Unlike the first embodiment, each of the measuring devices 1 and 2 according to the second embodiment is configured to be capable of measuring the power of four channels CH1 to CH4.

[0133] In the second embodiment, the measurement target of the measurement system 200 is a single-input, multiple-output power conversion device that converts DC power into AC power. An input terminal unit of the power conversion device is connected to one channel CH1 of the measurement device 1, and seven output terminal units of the power conversion device are connected to three channels CH2 to CH4 of the measurement device 1 and four channels CH1 to CH4 of the measurement device 2, respectively.

[0134] Since the measurement devices 1 and 2 of the second embodiment have the same configuration, the configuration of the measurement device 1 will be described in detail first.

[0135] The measuring device 1 includes four modules M1 to M4 and a main body B1.

[0136] The modules M1 to M4 have the same configuration as one another and have a portion of the configuration of the measurement device 1 of the first embodiment. The modules M1 to M4 are realized by, for example, an FPGA (Field-Programmable Gate Array).

[0137] In the second embodiment, each of the modules M1 to M4 has input terminal units 1A and 1B, a processing unit 10A, and a storage unit 20. The processing unit 10A has the same configuration as that shown in FIG.

[0138] The main body B1 executes transmission / reception processing and display processing of the measured amount and the synchronization signal Ss1 output from each processing unit 10A of the modules M1 to M4 in accordance with an operation signal indicating an input operation by a user from the external device 3. In the second embodiment, the main body B1 includes a processing unit 10C and a communication unit 50 configured to be able to communicate with the external device 3.

[0139] In the operation unit 30 of the external device 3, the user selects a channel for generating the synchronization signal Ss1 from among the channels CH1 to CH4 of the measurement device 1, and further selects one of the input terminal units 1A and 1B of the selected channel. As a result, the operation unit 30 generates a terminal selection signal indicating the input terminal unit of the selected channel as an operation signal. Then, the external device 3 transmits the terminal selection signal to the processing unit 10C via the communication unit 50.

[0140] Furthermore, in accordance with the content of the accepted input operation, the operation unit 30 generates, as an operation signal, a communication instruction signal for instructing transmission of the synchronization signal Ss1 to the measurement device 2. Then, the external device 3 transmits the communication instruction signal to the processing unit 10C via the communication unit 50.

[0141] First, when the processing unit 10C receives a terminal selection signal from the operation unit 30, it instructs the processing unit 10A corresponding to the channel indicated by the terminal selection signal to set the connection destination of the switch 13 to the input terminal indicated by the terminal selection signal. At this time, the processing units corresponding to the other channels stop generating the synchronization signal. As a result, the processing unit 10C receives the synchronization signal Ss1 only from the corresponding processing unit and supplies the received synchronization signal Ss1 to the other processing units.

[0142] Each processing unit 10A includes a calculation unit 16 as a first calculation unit that calculates a measurement amount of an input signal input to the input terminal units 1A and 1B at a measurement interval determined by the synchronization signal Ss1. Examples of the measurement amount include a voltage value, a current value, and a power value. Each processing unit 10A outputs the calculated power value to the processing unit 10C as a first power value.

[0143] The processing unit 10C may then calculate the power efficiency, which is the ratio of the first power value of each of the channels CH2 to CH4 to the first power value of the first channel CH1. At this time, the processing unit 10C functions as a first calculation unit that calculates the power efficiency based on the first power value and the second power value.

[0144] Furthermore, when the processing unit 10C acquires a communication instruction signal from the operation unit 30, it establishes communication between the measurement device 1 and the measurement device 2 in accordance with the communication instruction signal, and transmits a synchronization signal Ss1 to the measurement device 2 via the output terminal 1C.

[0145] Then, when the processing unit 10C acquires information indicating the power value or power efficiency of each of the channels CH1 to CH4, it transmits the acquired information to the external device 3 through the communication unit 50. The display unit 40 of the external device 3 displays the power value or power efficiency of each of the channels CH1 to CH4 acquired by the processing unit 10C. The display unit 40 may also display the waveform of the synchronization signal Ss1 together with the waveform of the current value, voltage value or power value.

[0146] Next, the configuration of the measurement device 2 will be briefly described.

[0147] The measurement device 2 includes four modules M5 to M8 and a main body B2, which have the same configuration as the modules M1 to M4 and the main body B1 of the measurement device 1.

[0148] In the measurement device 2, each of the modules M5 to M8 has input terminal sections 2A and 2B, a processing section 10A, and a storage section 20, and the main body section B1 has a processing section 10C and a communication section .

[0149] The operation unit 30 of the external device 3 generates a stop signal as an operation signal for stopping the generation of a synchronization signal for each of the processing units 10A of the modules M5 to M8 in accordance with the received input operation. Then, the external device 3 transmits the stop signal to the processing unit 10C via the communication unit 50.

[0150] In addition, the external device 3 may transmit a stop signal to the processing unit 10C of the measuring device 1, and the processing unit 10C of the measuring device 1 may transfer the received stop signal to the processing unit 10C of the measuring device 2 via the output terminal 1C.

[0151] In response to the generated stop signal, the processing unit 10C instructs each of the processing units 10A of the modules M5 to M8 to stop generating the synchronization signal by controlling the connection of the switch 13. Then, upon receiving the synchronization signal Ss1 from the measurement device 1 via the synchronization terminal 2C, the processing unit 10C supplies the synchronization signal Ss1 to each of the processing units 10A.

[0152] As a result, each processing unit 10A calculates the voltage value, current value, and power value of the input signal of each channel CH1 to CH4 as measurement quantities in accordance with the synchronization signal Ss1 generated by the measurement device 1, as shown in FIG. 3A.

[0153] That is, each processing unit 10A of the measurement device 2 includes a calculation unit 16 as a second calculation unit that calculates the measurement amount of the input signal input to the input terminal units 2A and 2B at the measurement interval determined by the synchronization signal Ss1 as shown in Fig. 2. Then, each processing unit 10A outputs the power value of each of the channels CH1 to CH4 to the processing unit 10C.

[0154] Furthermore, the processing unit 10C may acquire the power value of each of the channels CH1 to CH4 of the measurement device 2 as the second power value, and may acquire the power value of the first channel CH1 of the measurement device 1 as the first power value from the output terminal 1C of the measurement device 1. Then, the processing unit 10C may calculate the power efficiency of each of the second power values ​​of the channels CH1 to CH4 with respect to the first power value of the first channel CH1.

[0155] Alternatively, the processing unit 10C may transmit the power value of each of the channels CH1 to CH4 as the second power value to the processing unit 10C of the measurement device 1. Then, the processing unit 10C of the measurement device 1 may calculate the power efficiency of each of the second power values ​​of the channels CH1 to CH4 with respect to the power value of the first channel CH1 of the measurement device 1.

[0156] At this time, the processing unit 10C functions as a second calculation unit that calculates the power efficiency based on the first power value and the second power value. When the processing unit 10C acquires information indicating the power value or the power efficiency of each of the channels CH1 to CH4, the processing unit 10C transmits the acquired information to the external device 3 through the communication unit 50.

[0157] The display unit 40 of the external device displays the numerical values ​​of the power or power efficiency of each of the channels CH1 to CH4 acquired by the processing unit 10C. The display unit 40 may also display the waveform of the synchronization signal Ss1 together with the waveform of the current value, voltage value, or power value.

[0158] Next, the effects of the second embodiment will be described.

[0159] The measurement system 200 of the second embodiment has the same or equivalent configuration as the measurement system 100 of the first embodiment, and can achieve the same effects as the first embodiment.

[0160] For example, each processing unit 10A of the measuring device 1 functions as a first calculation unit that calculates a first power value based on the calculated voltage value and current value. Furthermore, each processing unit 10A of the measuring device 2 functions as a second calculation unit that calculates a second power value based on the calculated voltage value and current value. And, the processing unit 10C of the measuring device 1 or 2 functions as a first calculation unit or a second calculation unit that calculates the power efficiency based on the first power value and the second power value.

[0161] According to this configuration, all measurement amounts used to calculate the power value are calculated at the same timing and at measurement intervals of the same length, so that measurement errors in the power efficiency can be reduced.

[0162] In the second embodiment, the first power value of the first channel CH1 of the measurement device 1 is the magnitude of the input power of the power electronics device. The first power values ​​of the other channels CH2 to CH4 of the measurement device 1 and the second power values ​​of the channels CH1 to CH4 of the measurement device 2 are the magnitudes of the multiple output powers of the power electronics device.

[0163] According to this configuration, the power efficiency of each input / output of the power conversion device can be measured with high accuracy. In the second embodiment, a one-input, multiple-output power conversion device is described as an example of the measurement target, but the measurement system 200 can measure input signals from a multiple-input, single-output or multiple-input, multiple-output power conversion device, for example. In addition, conversion devices such as ACDC converters and DCDC converters can also be measured.

[0164] Third embodiment Next, a measurement system according to a third embodiment will be described with reference to Fig. 6. The third embodiment differs from the first embodiment in that the power value and power efficiency of the measurement target are calculated in an external device.

[0165] 6 is a diagram showing the configuration of a measurement system 300 according to a third embodiment. Here, components that are the same as or equivalent to those in the first embodiment are given the same reference numerals and overlapping descriptions are omitted.

[0166] The measurement system 300 includes measurement devices 1 and 2, and an external device 3 that communicates with each of the measurement devices 1 and 2. In the third embodiment, the measurement target of the measurement system 300 is a one-input, one-output power conversion device that converts DC power to AC power. An input terminal section of the power conversion device is connected to a first channel CH1 of the measurement device 1, and an output terminal section of the power conversion device is connected to the first channel CH1 of the measurement device 2.

[0167] In the measurement device 1, similarly to the first embodiment, the processing unit 10A calculates the voltage value and current value of the input signal input to the input terminal units 1A and 1B in accordance with the synchronization signal Ss1 generated by the feature point detection unit 14 shown in Fig. 2. Similarly, in the measurement device 2, when the processing unit 10B receives the synchronization signal Ss1 input from the output terminal 1C of the measurement device 1 to the synchronization terminal 2C, it calculates the voltage value and current value of the input signal input to the input terminal units 2A and 2B in accordance with the synchronization signal Ss1.

[0168] Then, the measuring device 1 transmits the voltage value and the current value calculated by the processing unit 10A to the external device 3 through its own communication unit 50. Similarly, the measuring device 2 transmits the voltage value and the current value calculated by the processing unit 10B to the external device 3 through its own communication unit 50.

[0169] The external device 3 has the function of the power calculation unit 163 shown in Fig. 2. The external device 3 is, for example, a personal computer, a mobile terminal such as a smartphone or a tablet, or a measurement device separate from the measurement devices 1 and 2.

[0170] When the external device 3 receives from the measurement device 1 the voltage value and current value of the input signal input to the input terminal units 1A and 1B, it calculates a first power value based on the received voltage value and current value. Also, when the external device receives from the measurement device 2 the voltage value and current value of the input signal input to the input terminal units 2A and 2B, it calculates a second power value based on the received voltage value and current value.

[0171] The external device 3 calculates the power efficiency of the measurement target based on the calculated first power value and second power value. In the third embodiment, the external device 3 calculates the power efficiency of the power electronics device by dividing the second power value of the power output from the output terminal of the power electronics device by the first power value of the power input to the input terminal of the power electronics device.

[0172] In the third embodiment, the external device 3 receives the calculation results of the measuring devices 1 and 2 of the first embodiment and calculates the power value and power efficiency based on these calculation results, but this is not limited to this. For example, the external device 3 may receive the calculation results of each channel of the measuring devices 1 and 2 of the second embodiment shown in Fig. 5 and calculate the power value and power efficiency of each channel based on these calculations.

[0173] Next, the effects of the third embodiment will be described.

[0174] In the third embodiment, the measurement system 300 includes an external device 3 that communicates with the measurement device 1 and the measurement device 2. The external device 3 calculates a power value based on the voltage value and the current value calculated by a processing unit 10A functioning as a first calculation unit of the measurement device 1 and a processing unit 10B functioning as a second calculation unit of the measurement device 2, respectively.

[0175] According to this configuration, when measurement device 1 measures the input power of an object to be measured and measurement device 2 measures the output power of the same object to be measured, it is possible to accurately grasp the relationship between the input and output of the object to be measured.

[0176] Furthermore, in the third embodiment, the external device 3 calculates a first power value based on the voltage value and current value calculated by the processing unit 10A of the measurement device 1, and calculates a second power value based on the voltage value and current value calculated by the processing unit 10B of the measurement device 2. Then, the external device 3 calculates the power efficiency based on the calculated first power value and second power value.

[0177] According to this configuration, all of the measurement quantities used to calculate the power value are calculated at measurement intervals based on the same synchronization signal Ss1, so that measurement errors in the power efficiency can be reduced.

[0178] In the third embodiment, the first power value is an input power of the power conversion device, and the second power value is an output power of the power conversion device. According to this configuration, since the measurement target is the power conversion device, it is possible to accurately measure the power efficiency of the power conversion device.

[0179] Although each embodiment of the present invention has been described above, the above-mentioned embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments.

[0180] For example, in the above embodiment, the system is configured with one measuring device 2, but may be configured with multiple measuring devices 2. In this case, it becomes possible to estimate the measurement amounts of multiple channels with higher accuracy than when there is only one measuring device 2.

[0181] In addition, in the above embodiment, the measuring devices 1 and 2 measured the input terminal section and the output terminal section of the measurement object such as a power conversion device, but the power transmitted at a measurement point along the input path or output path of the measurement object may also be measured.

[0182] In the above embodiment, each of the input terminal sections 1A, 1B, 2A and 2B is configured with a positive terminal and a negative terminal, but for example, if the measuring devices 1 and 2 are grounded, the ground potential may be used as the reference potential, and each of the input terminal sections 1A, 1B, 2A and 2B may be only a positive terminal.

[0183] Furthermore, in the first embodiment, the measuring devices 1 and 2 each have a plurality of input terminal units (1A, 1B) and (2A, 2B), but each of the measuring devices 1 and 2 may have only one input terminal unit.

[0184] Furthermore, in the second embodiment, each of the measurement devices 1 and 2 is provided with four modules M1 to M4, but each of the measurement devices 1 and 2 may be provided with two, three, or five or more modules.

[0185] In addition, in the second embodiment, the external device 3 was provided with an operation unit 30 and a display unit 40 for performing input operations by the user, but the operation unit 30 and the display unit 40 may be provided in the main body unit B1 of the measurement device 1 and the main body unit B2 of the measurement device 2.

[0186] Furthermore, in the second embodiment, each of the measurement devices 1 and 2 is provided with four modules M1 to M4, but each of the measurement devices 1 and 2 may be provided with two, three, or five or more modules. [Explanation of symbols]

[0187] 100, 200 Measurement System 1, 2 Measuring device (first measuring device, second measuring device) 1A, 1B, 2A, 2B Input terminal section (input terminal) 1C output terminal 2C Synchronization Terminal 10A Processing section (detection section, generation section, first calculation section, second calculation section) 10B Processing section (second calculation section) 10C Processing section (first calculation section, second calculation section) 14 Feature point detection unit (detection unit, generation unit) 16 Arithmetic unit (first arithmetic unit, second arithmetic unit) Ss1 Sync signal S2~S3, S4, S5 (generation step, output step, first calculation step) S6 (reception step, second calculation step)

Claims

1. 1. A measurement system comprising a plurality of measurement devices for measuring input signals, The first measuring device one or more input terminals for receiving the input signal; a detection unit that detects a feature point of the waveform of the input signal input to the input terminal; a generation unit that generates a synchronization signal for synchronizing operations of the measurement devices based on a timing at which the feature point is detected by the detection unit; a first calculation unit that calculates a measurement amount of the input signal input to the one or more input terminals at a measurement interval determined by the synchronization signal; an output terminal for outputting the synchronization signal generated by the generation unit, The one or more second measurement devices one or more input terminals for receiving the input signal; a synchronization terminal for receiving the synchronization signal output from an output terminal of the first measurement device; a second calculation unit that calculates a measurement amount of the input signal input to the one or more input terminals at the measurement interval determined by the synchronization signal; Measurement system.

2. 2. The measurement system of claim 1, the input signal is a voltage signal or a current signal; The measured quantity is an effective value or an average value of the voltage signal or the current signal. Measurement system.

3. 2. The measurement system of claim 1, the plurality of input terminals are provided in each of the measurement devices and include a voltage input terminal for receiving a voltage signal and a current input terminal for receiving a current signal; the first calculation unit and the second calculation unit each calculate, as the measurement quantity, a voltage value of the voltage signal and a current value of the current signal at the same measurement interval; Measurement system.

4. 4. The measurement system of claim 3, each of the first calculation unit and the second calculation unit calculates a power value based on the calculated voltage value and the calculated current value; Measurement system.

5. 5. The measurement system of claim 4, The first calculation unit calculates a first power value based on the calculated voltage value and the calculated current value, The second calculation unit calculates a second power value based on the calculated voltage value and the calculated current value, The first calculation unit or the second calculation unit calculates a power efficiency based on the first power value and the second power value. Measurement system.

6. 4. The measurement system of claim 3, an external device that communicates with the first measurement device and the second measurement device; the external device calculates a power value based on the voltage value and the current value calculated by the first calculation unit and the second calculation unit, respectively. Measurement system.

7. 7. The measurement system of claim 6, The external device is calculating a first power value based on the voltage value and the current value calculated by the first calculation unit; calculating a second power value based on the voltage value and the current value calculated by the second calculation unit; calculating a power efficiency based on the first power value and the second power value; Measurement system.

8. The measurement system according to claim 5 or 7, one of the first power value and the second power value is an input power of a power conversion device or a power transmitted to an input path of the power conversion device; The other is the output power of the power conversion device or the power transmitted to the output path of the power conversion device. Measurement system.

9. A first measuring device connected to a second measuring device that calculates a measured quantity of an input signal input to one or more input terminals at a measurement interval determined by a synchronization signal that synchronizes the operations of each of the plurality of measuring devices, one or more input terminals for receiving an input signal different from the input signal; a detection unit for detecting a feature point of a waveform of an input signal input to the input terminal; a generation unit that generates the synchronization signal based on a timing at which the feature point is detected by the detection unit; a first calculation unit that calculates a measurement amount of the input signal input to the one or more input terminals at a measurement interval determined by the synchronization signal; an output terminal for outputting the synchronization signal generated by the generation unit to the second measurement device; A first measuring device comprising:

10. A second measuring device connected to a first measuring device, the second measuring device comprising: a first calculation unit that calculates a measurement amount of an input signal input to one or more input terminals at a measurement interval determined by a synchronization signal that synchronizes operations of each of a plurality of measuring devices; detecting a feature point of a waveform of the input signal input to the input terminals; and generating the synchronization signal based on the detected timing, one or more input terminals for receiving an input signal different from the input signal; a synchronization terminal for receiving the synchronization signal output from the first measurement device; a second calculation unit that calculates a measurement amount of the input signal input to the one or more input terminals at the measurement interval determined by the synchronization signal; A second measuring device comprising:

11. 1. A measurement method performed by a plurality of measurement devices measuring one or more input signals, comprising: a generating step of generating a synchronization signal for synchronizing operations of the measurement devices based on a timing at which a characteristic point of a waveform of the input signal input to the first measurement device is detected; a first calculation step of calculating a measurement amount of the one or more input signals input to the first measurement device at a measurement interval determined by the synchronization signal; an output step of outputting the synchronization signal; a receiving step of receiving the synchronization signal output from the first measurement device to at least one second measurement device; a second calculation step of calculating a measurement amount of the one or more input signals input to the at least one second measurement device at the measurement interval determined by the synchronization signal; A measuring method comprising:

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