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

Abstract

A first measurement device of this measurement system is provided with one or more input terminals, and generates a synchronization signal on the basis of a timing at which a characteristic point of the waveform of an input signal input to one of the input terminals is detected. The first measurement device further includes an output terminal for outputting the generated synchronization signal, and calculates a measurement quantity of the input signal of the one or more input terminals at a measurement interval determined by the synchronization signal. One or more second measurement devices are provided with one or more input terminals and a synchronization terminal for receiving the synchronization signal output from the output terminal of the first measurement device, and calculate the measurement quantity of the input signal of the one or more input terminals at the measurement interval determined by the synchronization signal.

Description

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

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

[0002] JP2010-197223A discloses a wattmeter that synchronizes with the zero crossing point of the line voltage of the channel with the smallest number when there are multiple channels set for AC.

[0003] In the measurement devices described above, it is possible to synchronize the multiple channels of the device that are configured to accept inputs. However, to synchronize multiple measurement devices, the same signal must be input to each measurement device so that each measurement device can detect feature points such as zero-crossing points at the same timing.

[0004] The present invention has been made in view of these problems, and has as its object to synchronize a plurality of measuring devices without inputting the same signal to each of the measuring devices.

[0005] According to one aspect of the present invention, a measurement system includes multiple measurement devices that measure input signals. A first measurement device among the multiple measurement devices includes one or more input terminals for receiving the input signal, a detection unit for detecting feature points in the waveform of the input signal input to the input terminal, and a generation unit for generating a synchronization signal that synchronizes the operation of each measurement device based on the timing at which the detection unit detects the feature points. The first measurement device further includes a first calculation unit that calculates a measured quantity 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 the output terminal of the first measurement device, and a second calculation unit that calculates a measured quantity of the input signal input to the one or more input terminals at the measurement interval determined by the synchronization signal.

[0006] According to this aspect, since the synchronization signal generated by the first measuring device is transmitted to the second measuring device, it is possible to synchronize the first measuring device and the second measuring device with each other. Therefore, it is not necessary to input the same signal as that input to the detection unit of the first measuring device to the second measuring device so that the second measuring device detects the feature point at the same timing as the detection unit of the first measuring device detects the feature point.

[0007] Therefore, it is possible to synchronize the measurement devices without inputting the same signal to each of the measurement devices.

[0008] FIG. 1 is a diagram showing the basic configuration of a measurement system according to a first embodiment. FIG. 2 is a block diagram illustrating the details of a portion of the configuration of each measurement device constituting the measurement system. FIG. 3A is a diagram illustrating an example of a method for calculating a measured amount of a signal input to each measurement device in accordance with a synchronization signal according to the first embodiment. FIG. 3B is a diagram illustrating a method for calculating a measured amount of a signal input to each measurement device in accordance with a synchronization signal according to a comparative example. FIG. 4 is a flowchart showing an example of a measurement method using the measurement system. FIG. 5 is a diagram showing the configuration of a measurement system according to a second embodiment. FIG. 6 is a diagram showing the configuration of a measurement system according to a third embodiment.

[0009] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, the same or equivalent elements are designated by the same reference numerals throughout.

[0010] First Embodiment FIG. 1 is a diagram showing the configuration of a measurement system 100 according to a first embodiment.

[0011] The measurement system 100 is a system for measuring multiple measurement points, and measures input / output signals of a measurement target having one or more input ports and one or more output ports, such as a multi-input / single-output, single-input / multi-output, or multi-input / multi-output power converter or repeater.

[0012] As an example, a measurement system 100 according to 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.

[0013] Each of the measuring devices 1 and 2 is a computer configured with a processor, a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, and a bus that interconnects these.

[0014] Each of the measuring devices 1 and 2 of 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.

[0015] The measuring 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 measuring device 1 also outputs a synchronization signal to an output terminal 1C to synchronize the measurement operations of the measuring devices 1 and 2.

[0016] 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 to the input terminal unit 1A as an input signal from the input terminal unit of the converter.

[0017] 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.

[0018] 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.

[0019] 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 .

[0020] In the measuring 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.

[0021] 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. 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.

[0022] 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 values ​​of the voltage signal and the current signal.

[0023] The processing unit 10 also outputs the generated synchronization signal to the output terminal 1C. In addition to the synchronization signal, the processing unit 10 may also 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.

[0024] The storage unit 20 stores the measured quantities of 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.

[0025] The operation unit 30 is configured with a plurality of push buttons provided around the display screen, a touch sensor arranged within the display screen, a keyboard, a mouse, etc. The operation unit 30 receives input operations from the user and generates an operation signal indicating the content of the received input operation.

[0026] 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, among the multiple input terminal units 1A and 1B.

[0027] The display unit 40 displays, for example, the measurement results or measurement conditions obtained by the processing unit 10. The display unit 40 is configured, for example, as a touch panel so that the user can view information and operate it. Alternatively, the display unit 40 may be configured as a liquid crystal display, an LED display, or the like.

[0028] 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 obtained by the processing unit 10 to the external device. Examples of external devices include personal computers, mobile terminals such as smartphones and tablets, and measurement devices separate from the measurement devices 1 and 2.

[0029] Next, the configuration of the measurement device 2 will be described.

[0030] The measuring device 2 acquires, from its own synchronization terminal 2C, the synchronization signal input through the output terminal 1C of the measuring device 1. Based on the acquired synchronization signal, the measuring device 2 measures the input signal input to the input terminal unit 2A of the first channel CH1 and the input signal input to the input terminal unit 2B.

[0031] 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 from the output unit of the converter.

[0032] The input terminal section 2B has positive and negative current input terminals and is connected to the output section of the converter, and receives an AC current signal as an input signal from the output section of the converter.

[0033] 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.

[0034] 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.

[0035] 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 the voltage signal input to the input terminal 2A and the current signal input to the input terminal 2B. The processing unit 10 measures the power input to the first channel CH1 using the measured values ​​of the voltage signal and the current signal.

[0036] Furthermore, the processing unit 10 acquires the measured amount of power as a second power value, and acquires the measured amount of input power on the first channel CH1 of the measurement device 1 from the output terminal 1C as a first power value. Then, the processing unit 10 divides the second power value by the first power value to calculate the power efficiency of the converter.

[0037] 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.

[0038] Next, the detailed configuration of each of the measuring devices 1 and 2 will be described with reference to FIG.

[0039] 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, operation unit 30, and display unit 40 are omitted from Fig. 2, and the functional configuration of each processing unit 10 of the measurement devices 1 and 2 is shown.

[0040] 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 function of the processing unit 10 shown in FIG.

[0041] First, we will explain 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.

[0042] The voltage measurement unit 11 measures a voltage signal input to the input terminal unit 1A. The voltage measurement unit 11 of the first embodiment is a circuit that converts the voltage signal into a signal level within a predetermined measurement range. The voltage measurement unit 11 is composed of an amplifier that amplifies the input signal and an A / D converter that converts the amplifier's output signal into a digital signal.

[0043] The current measurement unit 12 measures the current signal input to the input terminal unit 1B. The current measurement unit 12 in the first embodiment is a circuit that converts the current signal into a signal level within a predetermined measurement range. The current measurement unit 12 is composed of an amplifier that amplifies the input signal and an A / D converter that converts the amplifier's output signal into a digital signal.

[0044] Switch 13 is a signal selector that selects one waveform signal to be used for generating 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.

[0045] 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. In other words, the switch 13 selects one of the multiple input signals input to the measurement device 1 as a synchronization source.

[0046] The feature point detector 14 functions as a detector 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 indicating the maximum or minimum value of the waveform, and points indicating the average or effective value of the waveform.

[0047] The feature point detector 14 in the first embodiment is configured by, for example, a zero-cross point detector circuit, and detects zero-cross points of the voltage signal output from the switch 13.

[0048] The feature point detection unit 14 also functions as a generation unit that generates a synchronization signal that synchronizes the measurement operations of the measurement devices 1 and 2 based on the timing at which the feature points are detected. The generated synchronization signal may be, for example, a pulse signal. The feature point detection unit 14 outputs the generated synchronization signal to the synchronization signal processing unit 15.

[0049] 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. If 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 formed by a pulse signal.

[0050] 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 also receive measurement results from the measurement device 2. In this way, the synchronization signal processing unit 15 has the function of communicating with the synchronization signal processing unit 15 of the measurement device 2 using any protocol.

[0051] When communication is performed between the synchronization signal processing units 15 of the measuring devices 1 and 2, for example, a communication method is employed in which the measuring device 1 accesses a specific memory area in the measuring device 2. In the first embodiment, the synchronization signal processing unit 15 of the measuring device 1 notifies the specific memory area in the synchronization signal processing unit 15 of the measuring device 2 of the zero-crossing point by write access.

[0052] 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 .

[0053] The calculation unit 16 functions as a first calculation unit that calculates a measurement quantity of an input signal input to at least one of the input terminal units 1A and 1B at a measurement interval determined by the synchronization signal. Examples of the measurement quantity include a voltage value, a current value, and a power value.

[0054] The voltage calculation unit 161 determines a measurement interval in accordance with the synchronization signal supplied from the synchronization signal processing unit 15, and sequentially calculates the voltage value of the voltage signal input to the input terminal unit 1A at each measurement interval. The calculated voltage value may be an average value or an effective value.

[0055] In the first embodiment, the voltage calculation unit 161 calculates the effective value of the voltage signal in accordance with 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 quantity.

[0056] Similar to the voltage calculation unit 161, the current calculation unit 162 determines a measurement interval in accordance with 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.

[0057] 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 measurement quantity.

[0058] 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.

[0059] Next, we will explain an example configuration of processing unit 10B of measuring device 2. In this example, operation unit 30 of measuring device 2 selects a signal input to synchronization terminal 2C as the synchronization signal of measuring device 2, and accordingly, the functions of switch 13 and feature point detection unit 14 are disabled.

[0060] Similar to the processing unit 10A, the processing unit 10B includes a voltage measurement unit 11, a current measurement unit 12, 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.

[0061] In addition to the functions described above, synchronization signal processing unit 15 receives a synchronization signal transmitted from measuring device 1 via 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 voltage calculation unit 161 and current calculation unit 162.

[0062] 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 terminals 2A and 2B at measurement intervals 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.

[0063] The voltage calculation unit 161, the current calculation unit 162, and the power calculation unit 163 have the same configuration as in the measurement device 1, and therefore, redundant descriptions thereof will be omitted here.

[0064] 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.

[0065] After calculating the second power value, the power calculation unit 163 may obtain the 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 calculate the power efficiency by dividing the second power value by the first power value.

[0066] At this time, in the measuring 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 measuring device 2. Then, in the measuring 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.

[0067] 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 of the converter. In this case, the synchronization signal processing unit 15 of the measuring device 2 transmits a first power value to the synchronization signal processing unit 15 of the measuring device 1.

[0068] 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.

[0069] 3A is a time chart illustrating 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 illustrating, as a comparative example, a method for calculating a measurement amount based on the synchronization signal Ss9 generated independently of the input signal.

[0070] 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.

[0071] 3A and 3B respectively show the AC waveform of a voltage signal input to input terminal 1A of measuring device 1 and the DC waveform of a voltage signal input to input terminal 2A of measuring device 2. In addition, in Figures 3A and 3B, 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 in which a voltage signal is input to each of input terminals 1A and 2A immediately after calculation timing Tc0.

[0072] 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.

[0073] The update period Pd between the calculation times Tc0 and Tc1 and between the calculation times Tc1 and Tc2 is a period for updating the measurement amount of the input signal, and is set to, for example, 50 ms. The measurement interval, which indicates the calculation period, is the period from the zero crossing point immediately before the previous calculation time Tc0 to the zero crossing point immediately before the current calculation time Tc1.

[0074] As shown in FIG. 3A, in accordance with the synchronization signal Ss1 output to the output terminal 1C of the measuring device 1, the voltage calculation units 161 of both the measuring devices 1 and 2 calculate the voltage values ​​of the voltage signals input to the input terminal units 1A and 2A, respectively.

[0075] 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 quantity. The measurement quantity here may be a representative value such as the average or median of the multiple effective values.

[0076] 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 from input terminals 1A and 1B, and power calculation unit 163 of measuring device 2 calculates a power value using the measured amounts from input terminals 2A and 2B.

[0077] At calculation timing Tc1, the measured quantities of two waveforms W1 and W2 within the measurement interval determined by synchronization signal Ss1 are 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 calculated.

[0078] 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.

[0079] 3B, the synchronization signal Ss9 is generated independently of the input signal, and therefore, no zero-crossing points are detected in the waveform of the voltage signal input to the input terminal 2A, and therefore the interval from the previous calculation timing Tc0 to Tc1, i.e., the update period Pd itself, becomes the measurement interval.

[0080] As a result, there is a discrepancy between 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. In this way, the power efficiency is calculated using two power values ​​calculated at different measurement intervals, which reduces the accuracy of the power efficiency measurement.

[0081] In contrast, in the first embodiment, the measurement interval is determined using synchronization signal Ss1 in both measurement devices 1 and 2, so that the error in the measurement quantity can be reduced compared to when synchronization signal Ss9 in the comparative example is used.

[0082] Next, the operation of the measurement system 100 in the first embodiment will be described with reference to FIG.

[0083] FIG. 4 is a flowchart showing an example of the processing procedure of the measurement method by the measurement system 100.

[0084] In this example, the input terminal 1A of the measuring device 1 is connected to the input terminal of the converter to be measured, and the input terminal 2A of the measuring device 2 is connected to the output terminal of the converter.

[0085] An output terminal of a current sensor that detects the current flowing through the power cable connected to the positive terminal of input terminal 1A is connected to input terminal 1B of measuring device 1. An output terminal of a current sensor that detects the current flowing through the power cable connected to the positive terminal of input terminal 2A is connected to 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.

[0086] 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.

[0087] In step S2, the measuring device 1 detects characteristic points in the waveform of the input signal based on the waveform signal input to the input terminal unit 1 A. Waveform signals include, for example, AC signals that oscillate around zero, and signals in which an AC signal is superimposed on a DC signal.

[0088] 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.

[0089] In step S3, the measurement device 1 generates a synchronization signal Ss1 in accordance with the timing at which the characteristic point is detected.

[0090] The processing of steps S2 and S3 above corresponds to a generation step of generating a synchronization signal Ss1 that synchronizes the operation of each of the measurement devices 1 and 2 based on the timing at which characteristic points in the waveform of the input signal input to the measurement device 1 are detected.

[0091] 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.

[0092] 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.

[0093] Specifically, the measurement device 1 in the first embodiment calculates, in synchronization with the synchronization signal Ss1, a measured quantity of the voltage signal input to the input terminal unit 1A and a measured quantity of the current signal input to the input terminal unit 1B. Furthermore, the measurement device 1 calculates a first power value as a new measured quantity using the measured quantities of the voltage signal and the current signal.

[0094] That is, the process of step S5 corresponds to a first calculation step of calculating the measurement amount of one or more input signals input to the measurement device 1 at measurement intervals determined by the synchronization signal Ss1.

[0095] 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 sections 2A and 2B in accordance with the synchronization signal Ss1.

[0096] The processing of step S6 corresponds to a reception 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 the measurement quantity of one or more input signals input to at least one measurement device 2 at a measurement interval determined by the synchronization signal Ss1.

[0097] Specifically, the measurement device 2 in the first embodiment calculates, in synchronization with the synchronization signal Ss1, a measured quantity of the voltage signal input to the input terminal unit 2A and a measured quantity of the current signal input to the input terminal unit 2B. Furthermore, the measurement device 2 calculates a second power value as a new measured quantity using the measured quantities of the voltage signal and the current signal.

[0098] In step S7, the measuring devices 1 and 2 each output the measurement results, such as a voltage value, a current value, a power value, and the power efficiency of the second power value relative to the first power value.

[0099] For example, the measuring device 1 in the first embodiment displays the voltage and current values, 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 measuring device 2 similarly outputs the measurement results.

[0100] When the process of step S7 is completed, the series of processes for the measurement method in the first embodiment is completed.

[0101] Next, the effects of the first embodiment will be described.

[0102] In the first embodiment, the measurement system 100 includes a plurality of measurement devices 1 and 2 for measuring input signals. The measurement device 1 is a first measurement device, and the measurement device 2 is a second measurement device.

[0103] The 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 that functions as a detection unit that detects feature points in the waveform of the input signal input to one input terminal unit 1A. The feature point detection unit 14 also functions as a generation unit that generates a synchronization signal Ss1 that synchronizes the operations of the measuring devices 1 and 2 based on the timing at which the feature points are detected.

[0104] 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.

[0105] 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 the input signal input to one or more input terminals at a measurement interval determined by the synchronization signal Ss1.

[0106] 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 in the waveform of one input signal input to the measurement device 1 is detected.

[0107] The measurement method further comprises a first calculation step (S5) of calculating the measured 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.

[0108] 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 the measurement quantity 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.

[0109] According to the configurations of measurement system 100 and measurement method described above, synchronization signal Ss1 generated by measurement device 1 is transmitted to measurement device 2, making it 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 of measurement device 1, 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.

[0110] Therefore, the measurement devices 1 and 2 can be synchronized with each other without inputting the same signal to each of the plurality of measurement devices 1 and 2 .

[0111] In the first embodiment, the input signal is a voltage signal or a current signal, and the measured quantity is the effective value or average value of the voltage signal or the current signal.

[0112] According to this configuration, it is possible to precisely calculate a plurality of measurement quantities of a measurement object to which a voltage signal or a current signal is input or output, with the measurement intervals being uniform.

[0113] In the first embodiment, input terminal units 1A and 1B each consisting of a plurality of input terminals are provided in measuring device 1, and input terminal units 2A and 2B each consisting of a plurality of input terminals are provided in measuring device 2. Input terminal units 1A and 2A are configured as voltage input terminals for receiving voltage signals, and input terminal units 1B and 2B are configured as current input terminals for receiving current signals.

[0114] Then, at the same measurement intervals, the voltage calculation unit 161 of each calculation unit 16 of measuring devices 1 and 2 calculates the voltage value of the voltage signal as the measurement quantity, and the current calculation unit 162 of each calculation unit 16 calculates the current value of the current signal as the measurement quantity. At this time, the voltage calculation unit 161 and current calculation unit 162 of measuring device 1 function as a first calculation unit, and the voltage calculation unit 161 and current calculation unit 162 of measuring device 2 function as a second calculation unit.

[0115] With this configuration, all measured values, including voltage and current values, are calculated at the same timing and at measurement intervals of the same length, so that the state of the load under test can be accurately estimated by comparing or calculating each of the measured values. For example, because all measured values ​​are calculated at the same measurement interval, it is possible to accurately estimate the power or power efficiency of the test object.

[0116] 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.

[0117] With this configuration, when measurement device 1 measures the input power of the 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.

[0118] In the first embodiment, the power calculation unit 163 of the measuring device 1 calculates a first power value based on the calculated voltage value and current value, and the power calculation unit 163 of the measuring 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.

[0119] According to this configuration, all measurement quantities used to calculate the power value are calculated at the same measurement interval, so that measurement errors in power efficiency can be reduced.

[0120] In the first embodiment, one of the first power value and the second power value is the input power of the power electronics device, and the other is the output power of the power electronics device.

[0121] 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.

[0122] In the first embodiment, the measurement device 1 is connected to a measurement device 2 that calculates a measurement quantity of an input signal input to input terminals 2A and 2B at measurement intervals determined by a synchronization signal Ss1.

[0123] As described above, the measurement device 1 includes input terminal units 1A and 1B, a feature point detection unit 14 as a detection unit and a generation unit, a calculation unit 16 as a first calculation unit, and an output terminal 1C.

[0124] According to this configuration, the measuring device 1 supplies the synchronization signal Ss1 that it generates to the measuring device 2. This enables the measuring device 2 to calculate the measurement quantity at measurement intervals determined by the synchronization signal Ss1 generated by the measuring device 1. This allows the measuring devices 1 and 2 to be synchronized with each other without inputting the same signal to each of the multiple measuring devices 1 and 2.

[0125] 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 characteristic points in the waveform of an input signal input to the input terminal unit 1A, and generates a synchronization signal Ss1 based on the detected timing.

[0126] As described above, the measuring device 2 includes the input terminal units 2A and 2B, the synchronization terminal 2C, and the calculation unit 16 as a second calculation unit.

[0127] With this configuration, measuring device 2 calculates the measured amount of the input signal input to input terminals 2A and 2B based on synchronization signal Ss1 generated by measuring device 1. This allows multiple measuring devices 1 and 2 to be synchronized with each other without inputting the same signal to each of them.

[0128] Second Embodiment Next, a measurement system according to a second embodiment will be described with reference to Fig. 5. In the second embodiment, components that are the same as or equivalent to those in the first embodiment will be assigned the same reference numerals, and duplicated descriptions will be omitted.

[0129] 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.

[0130] The external device 3 includes an operation unit 30 that accepts input operations from a user and a display unit 40, and is connected via wire or wirelessly to the measurement device 1 or 2. 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.

[0131] Unlike the first embodiment, each of the measuring devices 1 and 2 according to the second embodiment is configured to be able to measure the power of four channels CH1 to CH4.

[0132] In the second embodiment, the measurement target of the measurement system 200 is a single-input, multi-output power conversion device that converts DC power into AC power. An input terminal of the power conversion device is connected to one channel CH1 of the measurement device 1, and seven output terminals 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.

[0133] Since the measuring devices 1 and 2 of the second embodiment have the same configuration, the configuration of the measuring device 1 will be first described in detail.

[0134] The measuring device 1 includes four modules M1 to M4 and a main body B1.

[0135] The modules M1 to M4 have the same configuration as each other and have a part 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).

[0136] 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.

[0137] The main body B1 executes transmission / reception processing and display processing of the measured quantities and synchronization signals Ss1 output from the processing units 10A of the modules M1 to M4 in accordance with operation signals indicating input operations by the 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.

[0138] On the operation unit 30 of the external device 3, the user selects a channel for generating the synchronization signal Ss1 from among channels CH1 to CH4 of the measurement device 1, and then selects one of the input terminals 1A and 1B of the selected channel. This causes the operation unit 30 to generate a terminal selection signal indicating the input terminal of the selected channel as an operation signal. The external device 3 then transmits the terminal selection signal to the processing unit 10C via the communication unit 50.

[0139] Furthermore, in accordance with the content of the received input operation, the operation unit 30 generates, as an operation signal, a communication instruction signal that instructs the external device 3 to transmit 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.

[0140] 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 in the terminal selection signal to set the connection destination of the switch 13 to the input terminal indicated in the terminal selection signal. At this time, the processing units corresponding to the other channels stop generating synchronization signals. 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.

[0141] Each processing unit 10A includes a calculation unit 16 as a first calculation unit that calculates a measurement quantity 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 quantity 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.

[0142] The processing unit 10C may then calculate the power efficiency, which is the ratio of the first power value of the first channel CH1 to the first power value of each of the other channels CH2 to CH4. In this case, the processing unit 10C functions as a first calculation unit that calculates the power efficiency based on the first power value and the other first power values ​​as second power values.

[0143] In addition, when the processing unit 10C receives 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.

[0144] 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 via 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.

[0145] Next, the configuration of the measurement device 2 will be briefly described.

[0146] The measuring 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 measuring device 1.

[0147] In the measurement device 2, each of the modules M5 to M8 has input terminal units 2A and 2B, a processing unit 10A, and a storage unit 20, and the main body unit B1 has a processing unit 10C and a communication unit 50.

[0148] 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 processing unit 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.

[0149] 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.

[0150] In accordance with the generated stop signal, processing unit 10C instructs each processing unit 10A of modules M5 to M8 to stop generating the synchronization signal by controlling the connection of switch 13. Then, upon receiving synchronization signal Ss1 from measuring device 1 via synchronization terminal 2C, processing unit 10C supplies synchronization signal Ss1 to each processing unit 10A.

[0151] 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 measuring device 1, as shown in Figure 3A.

[0152] 2, each processing unit 10A of the measuring device 2 includes a calculation unit 16 as a second calculation unit that calculates the measured amount of the input signal input to the input terminal units 2A and 2B at the measurement interval determined by the synchronization signal Ss1. Each processing unit 10A outputs the power value of each of the channels CH1 to CH4 to the processing unit 10C.

[0153] Furthermore, the processing unit 10C may acquire the power values ​​of the channels CH1 to CH4 of the measurement device 2 as second power values, and may acquire the power value of the first channel CH1 of the measurement device 1 as a first power value from the output terminal 1C of the measurement device 1. The processing unit 10C of the measurement device 2 may then calculate the power efficiency of the second power values ​​of the channels CH1 to CH4 of the measurement device 2 relative to the first power value of the first channel CH1 of the measurement device 1.

[0154] Alternatively, the processing unit 10C of the measurement device 2 may transmit the power values ​​of the channels CH1 to CH4 of the measurement device 2 as second power values ​​to the processing unit 10C of the measurement device 1. The processing unit 10C of the measurement device 1 may then calculate the power efficiency of each of the second power values ​​of the channels CH1 to CH4 of the measurement device 2 relative to the power value of the first channel CH1 of the measurement device 1.

[0155] At this time, the processing unit 10C of the measuring device 1 or 2 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 power efficiency of each of the channels CH1 to CH4, the processing unit 10C transmits the acquired information to the external device 3 via the communication unit 50.

[0156] 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.

[0157] Next, the effects of the second embodiment will be described.

[0158] 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.

[0159] For example, each processing unit 10A of 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 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, processing unit 10C of measuring device 1 or 2 functions as a first calculation unit or a second calculation unit that calculates power efficiency based on the first power value and the second power value.

[0160] According to this configuration, all measurement quantities 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 power efficiency can be reduced.

[0161] In the second embodiment, the first power value of the first channel CH1 of the measuring device 1 is the magnitude of the input power of the power conversion device, and the first power values ​​of the other channels CH2 to CH4 of the measuring device 1 and the second power values ​​of the channels CH1 to CH4 of the measuring device 2 are the magnitudes of the multiple output powers of the power conversion device.

[0162] This configuration allows the power efficiency of each input and output of the power conversion device to be measured with high accuracy. In the second embodiment, a single-input, multiple-output power conversion device has been described as an example of the measurement target, but the measurement system 200 is not limited to this. For example, the measurement system 200 can also measure input signals from a multiple-input, single-output or multiple-input, multiple-output power conversion device. The measurement system 200 can also measure conversion devices such as AC-DC converters and DC-DC converters.

[0163] 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.

[0164] 6 is a diagram showing the configuration of a measurement system 300 according to the third embodiment. Here, components that are the same as or equivalent to those in the first embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0165] 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 of the power conversion device is connected to a first channel CH1 of the measurement device 1, and an output terminal of the power conversion device is connected to a first channel CH1 of the measurement device 2.

[0166] In measurement device 1, as in the first embodiment, processing unit 10A calculates the voltage and current values ​​of the input signal input to input terminal units 1A and 1B in accordance with synchronization signal Ss1 generated by feature point detection unit 14 shown in Fig. 2. Similarly, in measurement device 2, when processing unit 10B receives synchronization signal Ss1 input from output terminal 1C of measurement device 1 to synchronization terminal 2C, it calculates the voltage and current values ​​of the input signal input to input terminal units 2A and 2B in accordance with synchronization signal Ss1.

[0167] Then, the measuring device 1 transmits the voltage and current values ​​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 and current values ​​calculated by the processing unit 10B to the external device 3 through its own communication unit 50.

[0168] 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.

[0169] When the external device 3 receives from the measurement device 1 the voltage and current values ​​of the input signal input to the input terminals 1A and 1B, it calculates a first power value based on the received voltage and current values. When the external device receives from the measurement device 2 the voltage and current values ​​of the input signal input to the input terminals 2A and 2B, it calculates a second power value based on the received voltage and current values.

[0170] 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 conversion device by dividing the second power value of the power output from the output terminal of the power conversion device by the first power value of the power input to the input terminal of the power conversion device.

[0171] In the third embodiment, the external device 3 receives the calculation results of the measurement 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 measurement devices 1 and 2 of the second embodiment shown in Figure 5 and calculate the power value and power efficiency of each channel based on these calculations.

[0172] Next, the effects of the third embodiment will be described.

[0173] 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 that functions as a first calculation unit of the measurement device 1 and a processing unit 10B that functions as a second calculation unit of the measurement device 2.

[0174] With this configuration, when measurement device 1 measures the input power of the 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.

[0175] 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.

[0176] 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 power efficiency can be reduced.

[0177] In the third embodiment, the first power value is the input power of the power conversion device, and the second power value is the output power of the power conversion device. With this configuration, since the measurement target is the power conversion device, the power efficiency of the power conversion device can be measured with high accuracy.

[0178] Although the embodiments of the present invention have been described above, the above 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 embodiments.

[0179] For example, although the above embodiment is configured with one measurement device 2, it may be configured with multiple measurement devices 2. In this case, it becomes possible to estimate the measurement quantities of a large number of channels with higher accuracy than when there is only one measurement device 2.

[0180] In addition, in the above embodiment, the measuring devices 1 and 2 measured the input terminal section and 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.

[0181] Furthermore, 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 if, for example, 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 configured with only a positive terminal.

[0182] In addition, in the first embodiment, each of the measuring devices 1 and 2 is provided with multiple input terminal sections (1A, 1B) and (2A, 2B), but each of the measuring devices 1 and 2 may have only one input terminal section.

[0183] 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, five or more modules.

[0184] In addition, in the second embodiment, the external device 3 was provided with an operation unit 30 and a display unit 40 for performing user input operations, but the operation unit 30 and the display unit 40 may also be provided in the main body B1 of the measuring device 1 and B2 of the measuring device 2.

[0185] 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, five or more modules.

[0186] This application claims priority based on Japanese Patent Application No. 2023-119933, filed with the Japan Patent Office on July 24, 2023, the entire contents of which are incorporated herein by reference.

[0187] 100, 200 Measurement system 1, 2 Measurement device (first measurement device, second measurement device) 1A, 1B, 2A, 2B Input terminal unit (input terminal) 1C Output terminal 2C Synchronization terminal 10A Processing unit (detection unit, generation unit, first calculation unit, second calculation unit) 10B Processing unit (second calculation unit) 10C Processing unit (first calculation unit, second calculation unit) 14 Feature point detection unit (detection unit, generation unit) 16 Calculation unit (first calculation unit, second calculation unit) Ss1 Synchronization signal S2 to S3, S4, S5 (generation step, output step, first calculation step) S6 (reception step, second calculation step)

Claims

1. A measurement system comprising a plurality of measurement devices that measure input signals, wherein a first measurement device comprises: one or more input terminals for accepting the input signal; a detection unit for detecting characteristic points of a waveform of the input signal input to the input terminals; a generation unit for generating a synchronization signal for synchronizing operation of each of the measurement devices based on the timing at which the detection unit detects the characteristic points; 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; and one or more second measurement devices comprise: one or more input terminals for accepting the input signal; a synchronization terminal for accepting 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.

2. The measurement system according to claim 1, wherein 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.

3. A measurement system as claimed in claim 1, wherein the plurality of input terminals are provided in each of the measuring devices and include a voltage input terminal for receiving a voltage signal and a current input terminal for receiving a current signal, and each of the first calculation unit and the second calculation unit calculates, as the measured quantity, a voltage value of the voltage signal and a current value of the current signal at the same measurement interval.

4. A measurement system according to claim 3, wherein each of the first calculation unit and the second calculation unit calculates a power value based on the calculated voltage value and current value.

5. A measurement system as described in claim 4, wherein the first calculation unit calculates a first power value based on the calculated voltage value and current value, the second calculation unit calculates a second power value based on the calculated voltage value and current value, and the first calculation unit or the second calculation unit calculates power efficiency based on the first power value and the second power value.

6. A measurement system according to claim 3, further comprising an external device that communicates with the first measurement device and the second measurement device, the external device calculating a power value based on the voltage value and the current value calculated by the first calculation unit and the second calculation unit, respectively.

7. A measurement system as described in claim 6, wherein the external device calculates a first power value based on the voltage value and the current value calculated by the first calculation unit, calculates a second power value based on the voltage value and the current value calculated by the second calculation unit, and calculates power efficiency based on the first power value and the second power value.

8. A measurement system as claimed in claim 5 or claim 7, wherein 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, and the other is an output power of the power conversion device or a power transmitted to an output path of the power conversion device.

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 operation of each of a plurality of measuring devices, the first measuring device comprising: one or more input terminals for receiving an input signal different from the input signal; a detection unit that detects characteristic points of a waveform of the input signal input to the input terminals; a generation unit that generates the synchronization signal based on the timing at which the detection unit detects the characteristic points; a first calculation unit that calculates a measured quantity of the input signal input to the one or more input terminals at the measurement interval determined by the synchronization signal; and an output terminal for outputting the synchronization signal generated by the generation unit to the second measuring device.

10. A second measuring device connected to a first measuring device which has a first calculation unit which calculates a measurement amount of an input signal input to one or more input terminals at a measurement interval determined by a synchronization signal which synchronizes the operation of each of a plurality of measuring devices, detects characteristic points of a waveform of the input signal input to the input terminals, and generates the synchronization signal based on the detected timing, the second measuring device comprising: one or more input terminals for accepting an input signal different from the input signal; a synchronization terminal for accepting the synchronization signal output from the first measuring device; and a second calculation unit which 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.

11. A measurement method executed by a plurality of measuring devices measuring one or more input signals, comprising: a generation step of generating a synchronization signal that synchronizes the operation of each of the measuring devices based on the timing at which a characteristic point of the waveform of the input signal input to a first measuring device is detected; a first calculation step of calculating a measurement amount of the one or more input signals input to the first measuring device at a measurement interval determined by the synchronization signal; an output step of outputting the synchronization signal; a reception step of receiving the synchronization signal output from the first measuring device to at least one second measuring device; and a second calculation step of calculating a measurement amount of the one or more input signals input to the at least one second measuring device at the measurement interval determined by the synchronization signal.

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