CN211348608U

CN211348608U - Calibration system of analog input type electronic transformer calibrator

Info

Publication number: CN211348608U
Application number: CN201921740238.2U
Authority: CN
Inventors: 潘洋; 周力任; 冯建; 来磊; 詹国钟; 张明辉
Original assignee: Shanghai Institute of Measurement and Testing Technology
Current assignee: Shanghai Institute of Measurement and Testing Technology
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-08-25
Anticipated expiration: 2029-10-16

Abstract

The utility model discloses a calibration system of analog input formula electronic transformer check gauge, include: the first signal generator generates and outputs a first voltage signal according to preset parameters under the control of the synchronous trigger signal; the second signal generator generates and outputs a second voltage signal according to preset parameters under the control of the synchronous trigger signal; the first digital recorder and the second digital recorder respectively sample the first voltage signal and the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the first voltage signal and the second voltage signal; the controller calculates the received two amplitude data to obtain a ratio error standard value between the two voltage signals; and calculating according to preset parameters to obtain a phase error standard value between the two voltage signals. The utility model has the advantages of reduce measuring result's uncertainty.

Description

Calibration system of analog input type electronic transformer calibrator

Technical Field

The utility model belongs to the technical field of the mutual-inductor inspection technique and specifically relates to a calibration system of analog input formula electronic transformer check gauge is related to.

Background

In order to meet the increasing electric energy demand, national grid companies propose to build a unified and strong smart grid characterized by informatization, digitization, automation and interaction. The intelligent operation of the digital transformer substation is one of the basic links for realizing the intelligent power grid, and the electronic transformer is used as an important component of the digital transformer substation, and the performance of the electronic transformer directly influences the safety and economic benefit of the digital transformer substation and is also a necessary condition for accurate electric energy metering. The IEC60044-8 standard for electronic current transformers defines electronic transformers as follows: an apparatus consisting of one or more current or voltage sensors connected to a transmission system and to a secondary converter for transmitting quantities proportional to the quantities being measured, to a measuring instrument, a meter and a relay protection or control device. In the case of a digital interface, a group of electronic transformers share a merging unit to accomplish this function. By definition, the electronic transformer should include both analog quantity output and digital quantity output according to the type division of the output signal.

The electronic transformer calibrator is indispensable equipment for measuring errors of the electronic transformer. The conventional transformer calibrator calibrating device mainly aims at the conventional electromagnetic transformers (such as secondary voltage 100V and secondary current 5A), the analog quantity function of the electronic transformer calibrator, no matter the electronic current transformer or the electronic voltage transformer, the secondary output of the electronic transformer calibrator is a small voltage signal (such as secondary voltage 6.5V), the two are very different, the conventional calibrating method cannot meet the calibrating requirement of the analog quantity function of the electronic transformer calibrator, and a new method needs to be researched for calibration.

The key technical problems to be solved when the analog quantity function of the electronic transformer calibrator is calibrated comprise the following two aspects:

(1) the amplitude and phase of the reference analog voltage channel 100V and the measured small-signal voltage channel (6.5V) need to be accurately adjustable, and the amplitude and phase are compared in this way between the high voltage and the small-voltage signal.

(2) The amplitude and phase of the reference analog current channel 5A and the voltage channel (4V) of the small signal to be detected need to be accurately adjustable, and the amplitude and phase between the large current signal and the small voltage signal are compared in this way.

It can be seen that the existing calibration method does not consider how to improve the synchronicity of signal sampling and reduce the uncertainty of the measurement result.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a calibration system of analog input formula electronic transformer check gauge to the realization improves the synchronism of signal sampling and reduces the purpose of measuring result's uncertainty.

In order to realize the above purpose, the utility model discloses a following technical scheme realizes:

a calibration system of an analog input type electronic transformer calibrator comprises:

the device comprises a first signal generator, a second signal generator, a first digital recorder, a second digital recorder and a controller;

the first signal generator generates and outputs a first voltage signal according to a preset parameter under the control of the synchronous trigger signal;

the second signal generator generates and outputs a second voltage signal according to preset parameters under the control of the synchronous trigger signal;

the first digital recorder samples the first voltage signal under the control of a high-stability time base synchronous sampling signal to obtain and output amplitude data of the first voltage signal;

the second digital recorder samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the second voltage signal;

the controller calculates the received amplitude data of the first voltage signal and the received amplitude data of the second voltage signal to obtain a ratio error standard value between the first voltage signal and the second voltage signal; and calculating according to preset parameters to obtain a phase error standard value between the first voltage signal and the second voltage signal.

Preferably, the method further comprises the following steps: when a voltage measurement loop of the analog input type electronic transformer calibrator is calibrated, the first voltage signal and the second voltage signal are respectively transmitted to a voltage measurement loop of the calibrated analog input type electronic transformer calibrator, and the calibrated analog input type electronic transformer calibrator calculates the first voltage signal and the second voltage signal to obtain a ratio error measurement value and a phase error measurement value between the first voltage signal and the second voltage signal.

Preferably, when calibrating the current measurement loop of the analog input type electronic transformer calibrator, the method further comprises: and the transconductance amplifier is used for correspondingly converting the first voltage signal or the second voltage signal into a current signal and outputting the current signal.

Preferably, the first digital recorder samples the first voltage signal under the control of the high-stability time-base synchronous sampling signal, so as to obtain and output amplitude data of the first voltage signal;

and the controller calculates according to the transconductance coefficient of the transconductance amplifier, the received amplitude data of the first voltage signal and the amplitude data of the second voltage signal to obtain a ratio error standard value and a phase error standard value between the unconverted voltage signal and the current signal.

Preferably, the method further comprises the following steps: and correspondingly transmitting the current signal obtained by converting one of the first voltage signal and the second voltage signal and one of the first voltage signal and the second voltage signal to a voltage measurement loop and a current measurement loop of the calibrated analog input type electronic transformer calibrator respectively, wherein the calibrated analog input type electronic transformer calibrator calculates the first voltage signal and the current signal to obtain a ratio error measurement value and a phase error measurement value between the unconverted voltage signal and the current signal.

Preferably, the controller is an upper computer, and is further configured to display a ratio error criterion value and a phase error criterion value between the first voltage signal and the second voltage signal, and display a ratio error criterion value and a phase error criterion value between the unconverted voltage signal and the current signal.

Preferably, the upper computer is further configured to continuously adjust the amplitude and the phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time.

Preferably, the first signal generator and the second signal generator are both voltage signal generators.

Preferably, a clock output terminal of one of the first signal generator and the second signal generator is connected to a clock input terminal of the other signal generator, wherein the clock signal generated by one of the signal generators is input into the other signal generator, so that the first voltage signal and the second voltage signal generated by the first signal generator and the second signal generator are in the same clock.

Preferably, the resolution of the first digital recorder and the second digital recorder is 28 bits.

Preferably, the preset parameters comprise the amplitude, the frequency and the trigger state for controlling the voltage signals generated by the first signal generator and the second signal generator; and a range and sampling mode of the first data logger and the second data logger.

Compared with the prior art, the utility model has the following advantage:

1) the utility model discloses a calibration system of analog input formula electronic transformer check gauge, include: the device comprises a first signal generator, a second signal generator, a first digital recorder, a second digital recorder and a controller; the first signal generator generates and outputs a first voltage signal according to a preset parameter under the control of the synchronous trigger signal; the second signal generator generates and outputs a second voltage signal according to preset parameters under the control of the synchronous trigger signal; the first digital recorder samples the first voltage signal under the control of a high-stability time base synchronous sampling signal to obtain and output amplitude data of the first voltage signal; the second digital recorder samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the second voltage signal; the controller calculates the received amplitude data of the first voltage signal and the received amplitude data of the second voltage signal to obtain a ratio error standard value between the first voltage signal and the second voltage signal; and calculating according to preset parameters to obtain a phase error standard value between the first voltage signal and the second voltage signal. Therefore, the utility model provides a calibration system of analog input formula electronic transformer check gauge can be used for calibrating the analog quantity function of analog input formula electronic transformer check gauge, satisfies its quantity value demand of tracing to the source, has promoted measuring capability and characteristic of tracing to the source, just first digital record appearance with the sampling is triggered by the synchronous sampling signal of external high stable time base to the second digital record appearance, improves the sampling synchronism of two digital record appearance, can accurately confirm first voltage signal with ratio (amplitude) error and phase error between the second voltage signal, improved right the check-up capability of analog input formula electronic transformer check gauge to and the degree of accuracy of check-up result or the uncertainty that has reduced the testing result.

2) The utility model discloses still pass through the controller realizes that real-time continuous adjustment first signal generator and second signal generator export respectively amplitude and the purpose of phase place between first voltage signal and the second voltage signal. Therefore, the problem that the phase of the adopted calibration signal cannot be continuously adjusted in the calibration process of the analog input type electronic transformer calibrator in the prior art can be solved, namely the limitation of phase adjustment in the prior art is solved; the purpose of comprehensively verifying the measuring range of the analog input type electronic transformer calibrator in a covering manner can be achieved, namely the purpose of respectively verifying different measuring ranges of the analog input type electronic transformer calibrator can be achieved by continuously adjusting the amplitude and the phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time through the controller, and the accuracy of verifying the analog input type electronic transformer calibrator is further improved.

3) The utility model provides a first signal generator with second signal generator is voltage signal generator, can know from this, the utility model discloses can make full use of the high steady and the high-accuracy nature of first signal generator and second signal generator time base makes first voltage signal with second voltage signal's phase adjustment can reach high resolution ratio and precision, and from this, it has further improved the check-up the degree of accuracy of analog input formula electronic transformer check-up appearance.

4) The utility model provides a first digital recorder with the resolution ratio of second digital recorder is 28 bits. The first digital recorder and the second digital recorder are both high-precision digital recorders, the first voltage signal and the second voltage signal are sampled by the high-precision digital recorders in an analog voltage digital sampling mode, and the obtained amplitude data of the voltage signals are actual value data of the amplitudes of the reference signal (first voltage signal) and the measured signal (second voltage signal) which are led into a voltage measurement loop of the measured analog input type electronic transformer calibrator. Therefore, the accuracy of verifying the analog input type electronic transformer calibrator is further improved. And, because ratio (amplitude) error is calculated according to the amplitude data that high accuracy digital record appearance recorded and is obtained, and phase error is according to preset parameter calculates and obtains, can know from this, the utility model discloses both need not to compensate its (between first voltage signal and the second voltage signal) phase characteristic's difference, also need not to revise because the phase place measuring error that high accuracy digital record appearance hardware delayed and brought, the utility model discloses only need satisfy amplitude measuring relative accuracy can, can know from this, the utility model discloses greatly reduced to high accuracy digital record appearance's amplitude and phase place measurement requirement.

5) The utility model provides a the controller is the host computer, and it still is used for showing first voltage signal with ratio error standard value and phase error standard value between the second voltage signal, and show voltage signal not through the conversion with ratio error standard value and phase error standard value between the current signal. Therefore, the verified analog input type electronic transformer calibrator directly displays the verification result of the calibration voltage measurement circuit or the calibration current measurement circuit, so that the staff can obtain the verification result visually, and the verification efficiency is improved.

6) The utility model provides a first signal generator with one of the second signal generator's clock output end is connected with another signal generator's clock input end, one of them the produced clock signal of signal generator inputs another inside the signal generator, make first signal generator with the second signal generator produces first voltage signal and second voltage signal are with the clock. Therefore, the utility model discloses a clock output with a signal generator is as another signal generator's clock input, utilizes signal generator's the same clock characteristic, can realize the arbitrary regulation of amplitude and phase place between two way signals (first voltage signal and second voltage signal) conveniently high-efficiently.

7) When the current measurement return circuit of calibration analog input formula electronic transformer check gauge, the utility model discloses still include: and the transconductance amplifier is used for correspondingly converting the first voltage signal or the second voltage signal into a current signal and outputting the current signal. Specifically, the first digital recorder samples the first voltage signal under the control of the high-stability time-base synchronous sampling signal, so as to obtain and output amplitude data of the first voltage signal; the second digital recorder samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the second voltage signal; and the controller calculates according to the transconductance coefficient of the transconductance amplifier, the received amplitude data of the first voltage signal and the amplitude data of the second voltage signal to obtain a ratio error standard value and a phase error standard value between the unconverted voltage signal and the current signal. Therefore, the utility model discloses can realize right the calibration of the voltage measurement return circuit of analog input formula electronic transformer check gauge can realize again the calibration to the current measurement return circuit of analog input formula electronic transformer check gauge, can know from this that its quantity value that is applicable to analog input formula electronic transformer check gauge analog quantity function traces to the source.

Drawings

Fig. 1 is a block diagram of a calibration system calibration voltage measurement circuit of an analog input type electronic transformer calibrator according to an embodiment of the present invention;

fig. 2 is a block diagram of a calibration system for calibrating a current measurement loop of an analog input type electronic transformer calibrator according to an embodiment of the present invention.

Description of reference numerals:

110-a first signal generator; 120-a second signal generator; 210-a first digital recorder; 220-a second digital recorder; 310-voltage measuring loop of analog input type electronic transformer calibrator; 400-a controller; 320-a current measuring loop of the analog input type electronic transformer calibrator; 500-transconductance amplifier.

Detailed Description

As described in the background, the existing calibration method has the problem of not considering how to improve the synchronization of signal sampling and reduce the uncertainty of the measurement result. Specifically, it is found from the published patents and documents that the conventional calibration method for the electronic transformer calibrator, that is, the method for calibrating the analog function of the electronic transformer calibrator, mainly includes the following steps:

the document "calibration of electronic transformer calibrator" (gunn peak, river north power technology, vol.34, No.4,2015) only shows a method for calibrating the voltage function, and cannot calibrate the current function. In the calibration of the voltage function, the ratio error adopts a resistance voltage division mode, and the phase error adopts a resistance-capacitance series connection mode. The problem with this approach is that the voltage division is done with a dc resistance box ZX78, not taking into account the effect of its ac characteristics on its phase error. The phase error of the 0.02-grade 1 muF alternating current capacitor is calibrated only at 1kHz in China at present, and the characteristic of the capacitor at power frequency is difficult to estimate. And the phase error regulation is realized through a direct current resistance box, the alternating current characteristic of the phase error regulation is difficult to evaluate, if the output orthogonal component is extremely small, the resistance value of the resistance box is required to be small, the accuracy is difficult to guarantee at the moment, and the uncertainty is large.

In the document, "electronic transformer calibrator test scheme research" (xu hong wei, Guizhou power technology, Vol.17No.5,2014), an electronic transformer calibrator which calibrates small signal output by using a standard power source and a multifunctional electric energy meter can only obtain a single-point zero ratio error because the ratio error cannot be adjusted, and cannot adjust the phases of a reference channel and a measured small signal channel and cannot obtain a phase error. The accuracy grade given by the method in the literature is only 0.05 grade, is the same as that of the electronic transformer to be tested, can only carry out comparison test on the tested electronic transformer, and cannot finish calibration and tracing.

The invention discloses a calibration test device (application number: 201010117234.6) of an electronic transformer calibrator, which needs a synchronous pulse generator to be connected with a synchronous clock input unit of the calibrated electronic transformer calibrator when calibrating the analog quantity calibration function of the electronic transformer calibrator. This shows that the standard signal and the measured signal are phase-controlled by D/a method, which only ensures zero crossing point trigger to generate standard and measured small signals, and cannot realize continuous phase adjustment.

The existing calibration method has the defects that the alternating current characteristic is difficult to evaluate in ratio error check, the phase error cannot be continuously adjusted, only single-point verification can be carried out on zero, the measurement uncertainty is large, and the like.

The calibration system of the analog input electronic transformer calibrator provided by the present invention will be described in detail with reference to fig. 1 to 2 and the following detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limitation of the implementation of the present invention, so that the present invention does not have the essential significance in the technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

The utility model discloses a core thought lies in providing a calibration system of analog input formula electronic transformer check gauge can be used for calibrating the analog function of analog input formula electronic transformer check gauge, satisfies its quantity value demand of tracing to the source, has promoted measuring capability and characteristic of tracing to the source, just first digital record appearance with the sampling is triggered by the synchronous sampling signal of external high stable time base to the second digital record appearance, improves the sampling synchronism of two digital record appearance, can accurately confirm first voltage signal with ratio (amplitude) error and phase error between the second voltage signal have improved right the check capability of analog input formula electronic transformer check gauge to and the degree of accuracy of check result perhaps has reduced the uncertainty of inspection result.

Example one

Specifically, as shown in fig. 1, the calibration system of the analog input type electronic transformer calibrator of the present embodiment is adapted to calibrate a voltage measurement loop of the analog input type electronic transformer calibrator, and includes: a first signal generator 110, a second signal generator 120, a first digital recorder 210, a second digital recorder 220, and a controller 400.

The output end of the first signal generator 110 is connected to the input end of the first digital recorder 210 and one of the two analog channels of the checking analog input type electronic transformer checker, in this embodiment, it is connected to the analog channel as the reference signal channel.

The output end of the second signal generator 120 is respectively connected to the input end of the second digital recorder 220 and the other analog channel of the two analog channels of the checking analog input type electronic transformer checker, in this embodiment, it is connected to the analog channel as the tested signal channel; the input of the controller 400 is connected to the output of the first digital recorder 210 and the output of the second digital recorder 220, respectively.

The first signal generator 110 generates and outputs a first voltage signal according to a preset parameter under the control of the synchronous trigger signal.

The second signal generator 120 generates and outputs a second voltage signal according to a preset parameter under the control of the synchronous trigger signal.

The first digital recorder 210 samples the first voltage signal under the control of the high-stability time-base synchronous sampling signal, and obtains and outputs amplitude data of the first voltage signal.

The second digital recorder 220 samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal, and obtains and outputs amplitude data of the second voltage signal.

The controller 400 calculates the received amplitude data of the first voltage signal and the received amplitude data of the second voltage signal to obtain a ratio error standard value between the first voltage signal and the second voltage signal; and calculating according to preset parameters to obtain a phase error standard value between the first voltage signal and the second voltage signal.

The first voltage signal and the second voltage signal are respectively transmitted to a voltage measurement loop 310 of the calibrated analog input type electronic transformer calibrator through two analog channels (a reference signal channel and a measured signal channel) arranged in the calibrated analog input type electronic transformer calibrator, and the calibrated analog input type electronic transformer calibrator calculates the first voltage signal and the second voltage signal to obtain a ratio error measurement value and a phase error measurement value between the first voltage signal and the second voltage signal. The ratio error measurement value and the phase error measurement value are the ratio error measurement value and the phase error measurement value of the voltage measurement loop 310 of the calibrated analog input electronic transformer calibrator.

Further, before the calibration is started, that is, before the first voltage signal and the second voltage signal are generated, according to a measurement range to be calibrated of the voltage measurement loop 310 of the calibrated analog input electronic transformer calibrator, the controller 400 may send a configuration parameter command to the first signal generator 110 and the second signal generator 120, that is, send the preset parameters, where in this embodiment, the preset parameters include an amplitude, a frequency, and a trigger state for controlling the voltage signals generated by the first signal generator and the second signal generator; and the range and sampling mode of the first and second digital recorders (in this embodiment, the sampling mode used is an analog voltage digital sampling mode). The first signal generator 110 and the second signal generator 120 output the first voltage signal and the second voltage signal whose amplitudes and phases are freely adjustable according to the received configuration parameter command.

Therefore, the calibration system of the analog input type electronic transformer calibrator provided by the embodiment can be used for calibrating the analog function of the analog input type electronic transformer calibrator, meets the requirement of the magnitude traceability of the analog input type electronic transformer calibrator, improves the measurement capability and the traceability characteristic, triggers the sampling of the first digital recorder and the second digital recorder by the external high-stability time-base synchronous sampling signal, improves the sampling synchronism of the two digital recorders, namely, can accurately determine the ratio (amplitude) error and the phase error between the first voltage signal and the second voltage signal, improves the calibration capability of the analog input type electronic transformer calibrator, and the accuracy of the calibration result or reduces the uncertainty of the calibration result. The present embodiment also achieves the purpose of continuously adjusting the amplitude and phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time through the controller 400. Therefore, the problem that the phase of the adopted calibration signal cannot be continuously adjusted in the calibration process of the analog input type electronic transformer calibrator in the prior art can be solved, namely the limitation of phase adjustment in the prior art is solved; the purpose of comprehensively verifying the measuring range of the analog input type electronic transformer calibrator in a covering manner can be achieved, namely the purpose of respectively verifying different measuring ranges of the analog input type electronic transformer calibrator can be achieved by continuously adjusting the amplitude and the phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time through the controller, and the accuracy of verifying the analog input type electronic transformer calibrator is further improved.

Preferably, in this embodiment, the controller 400 is an upper computer, and is further configured to display a ratio error standard value and a phase error standard value between the first voltage signal and the second voltage signal. Therefore, the analog input type electronic transformer calibrator which is calibrated directly displays the ratio error (ratio error measured value) and the phase error (phase error measured value) of the calibration voltage measurement loop, so that a worker can conveniently and visually obtain a calibration result, and the calibration efficiency is improved. Specifically, the ratio error standard value and the ratio error measurement value are compared, and the phase error standard value and the phase error measurement value are compared, thereby obtaining a verification result. Specifically, for example, the ratio error standard value and the ratio error measurement value, and the phase error standard value and the phase error measurement value may be respectively subjected to difference calculation, if the calculation result is within a preset range, the accuracy of the analog input type electronic transformer calibrator may be considered to be satisfactory, and if the calculation result is not within the preset range, the accuracy of the analog input type electronic transformer calibrator may be considered to be unsatisfactory.

Preferably, in this embodiment, the first signal generator and the second signal generator are both voltage signal generators, so that this embodiment can make full use of the characteristics of high stability and high accuracy of the time bases of the first signal generator and the second signal generator, so that the phase adjustment of the first voltage signal and the second voltage signal can achieve extremely high resolution and accuracy, thereby further improving the accuracy of verifying the analog input type electronic transformer calibrator.

Further, before the working power supplies of the first signal generator and the second signal generator are started immediately before the verification is started, the clock output end of one signal generator of the first signal generator and the second signal generator is connected with the clock input end of the other signal generator, so that when the working power supplies of the first signal generator and the second signal generator are started, the clock signal generated by one signal generator is input into the other signal generator, and the first voltage signal and the second voltage signal generated by the first signal generator and the second signal generator are enabled to be in the same clock. Therefore, in the embodiment, the clock output of one signal generator is used as the clock input of the other signal generator, and the amplitude and the phase of the two signals (the first voltage signal and the second voltage signal) can be adjusted freely and efficiently by using the same clock characteristic of the signal generator.

Preferably, in this embodiment, the resolution of the first digital recorder and the second digital recorder is 28 bits. The first digital recorder and the second digital recorder are both high-precision digital recorders, the first voltage signal and the second voltage signal are sampled by the high-precision digital recorders in an analog voltage digital sampling mode, and the obtained amplitude data of the voltage signals are actual value data of the amplitudes of the reference signal (first voltage signal) and the measured signal (second voltage signal) which are led into a voltage measurement loop of the measured analog input type electronic transformer calibrator. Therefore, the accuracy of verifying the analog input type electronic transformer calibrator is further improved. Moreover, the ratio (amplitude) error is calculated according to the amplitude data recorded by the high-precision digital recorder, and the phase error is calculated according to the preset parameter, so that the embodiment does not need to compensate the difference of the phase characteristics (between the first voltage signal and the second voltage signal) of the high-precision digital recorder, and does not need to correct the phase measurement error caused by the hardware delay of the high-precision digital recorder.

Example two

As shown in fig. 2, the calibration system of the analog input electronic transformer calibrator of the present embodiment is suitable for calibrating a current measurement loop of the analog input electronic transformer calibrator, and compared with the first embodiment, the calibration system of the analog input electronic transformer calibrator is different in that the calibration system further includes:

a transconductance amplifier 500, wherein the transconductance amplifier 500 is configured to correspondingly convert the first voltage signal or the second voltage signal into a current signal and output the current signal. In this embodiment, the input end of the transconductance amplifier 500 is connected to the output end of the second signal generator 120, and the output end thereof is connected to the measured signal channel of the analog input electronic transformer calibrator, so as to convert the second voltage signal into the current signal and transmit the current signal to the current measurement circuit 320 of the calibration analog input electronic transformer calibrator. Specifically, the first digital recorder 210 samples the first voltage signal under the control of the high stability time-base synchronous sampling signal, so as to obtain and output amplitude data of the first voltage signal; the second digital recorder 220 samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the second voltage signal; the controller 400 calculates according to the transconductance coefficient of the transconductance amplifier 500, the received amplitude data of the first voltage signal, and the amplitude data of the second voltage signal, to obtain a ratio error criterion value and a phase error criterion value between the unconverted voltage signal (in this embodiment, the first voltage signal) and the current signal.

In this embodiment, the first voltage signal is transmitted to the current measurement loop 320 of the calibrated analog input electronic transformer calibrator through one (reference signal) of the two analog channels of the calibrated analog input electronic transformer calibrator, the current signal is transmitted to the current measurement loop 320 of the calibrated analog input electronic transformer calibrator through the other (measured signal) of the two analog channels of the calibrated analog input electronic transformer calibrator, the calibrated analog input electronic transformer calibrator calculates the first voltage signal and the current signal to obtain a ratio error measurement value and a phase error measurement value between the unconverted voltage signal (first voltage signal) and the current signal, namely, the ratio error measurement value and the phase error measurement value of the current measurement loop 320 of the analog input type electronic transformer calibrator to be verified are obtained.

Preferably, in this embodiment, the controller 400 is an upper computer, and is further configured to display a ratio error standard value and a phase error standard value between the first voltage signal and the current signal. Therefore, the analog input type electronic transformer calibrator which is calibrated directly displays the ratio error (ratio error measured value) and the phase error (phase error measured value) of the calibration current measurement loop, so that a worker can conveniently and visually obtain a calibration result, and the calibration efficiency is improved. Specifically, the ratio error standard value and the ratio error measured value are compared, and the phase error standard value and the phase error measured value are compared, so as to obtain a calibration result, specifically, for example, the ratio error standard value and the ratio error standard value, and the phase error standard value and the phase error measured value are respectively subjected to difference operation, if the operation result is within a preset range, the accuracy of the analog input type electronic transformer calibrator can be considered to be satisfactory, and if the operation result is not within the preset range, the accuracy of the analog input type electronic transformer calibrator can be considered to be unsatisfactory.

Thus, since the second embodiment includes all the components provided in the first embodiment, it has all the advantages or advantages of the first embodiment, that is, the calibration system of the analog input type electronic transformer calibrator provided in this embodiment can be used for calibrating the analog function of the analog input type electronic transformer calibrator, thereby satisfying the requirement of the quantity tracing, improving the measurement capability and tracing characteristics, the first digital recorder and the second digital recorder are triggered and sampled by an external high-stability time base synchronous sampling signal, so that the sampling synchronism of the two digital recorders is improved, namely, the ratio (amplitude) error and the phase error between the first voltage signal and the second voltage signal can be accurately determined, the calibration capability of the analog input type electronic transformer calibrator is improved, and the accuracy of a calibration result is improved or the uncertainty of a test result is reduced. The present embodiment also achieves the purpose of continuously adjusting the amplitude and phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time through the controller 400. Therefore, the problem that the phase of the adopted calibration signal cannot be continuously adjusted in the calibration process of the analog input type electronic transformer calibrator in the prior art can be solved, namely the limitation of phase adjustment in the prior art is solved; the purpose of comprehensively verifying the measuring range of the analog input type electronic transformer calibrator in a covering manner can be achieved, namely the purpose of respectively verifying different measuring ranges of the analog input type electronic transformer calibrator can be achieved by continuously adjusting the amplitude and the phase between the first voltage signal and the second voltage signal respectively output by the first signal generator and the second signal generator in real time through the controller, and the accuracy of verifying the analog input type electronic transformer calibrator is further improved. In this embodiment, the first signal generator and the second signal generator are both voltage signal generators, so that the characteristics of high stability and high accuracy of the time bases of the first signal generator and the second signal generator can be fully utilized in this embodiment, so that the phase adjustment of the first voltage signal and the second voltage signal can reach extremely high resolution and precision, and thus, the accuracy of verifying the analog input type electronic transformer calibrator is further improved. Further, before the working power supplies of the first signal generator and the second signal generator are started immediately before the verification is started, the clock output end of one signal generator of the first signal generator and the second signal generator is connected with the clock input end of the other signal generator, so that when the working power supplies of the first signal generator and the second signal generator are started, the clock signal generated by one signal generator is input into the other signal generator, and the first voltage signal and the second voltage signal generated by the first signal generator and the second signal generator are enabled to be in the same clock. Therefore, in the embodiment, the clock output of one signal generator is used as the clock input of the other signal generator, and the amplitude and the phase of the two signals (the first voltage signal and the second voltage signal) can be adjusted freely and efficiently by using the same clock characteristic of the signal generator. And, in this embodiment, the resolution of the first digital recorder and the second digital recorder is 28 bits. The first digital recorder and the second digital recorder are both high-precision digital recorders, the first voltage signal and the second voltage signal are sampled by the high-precision digital recorders in an analog voltage digital sampling mode, and the obtained amplitude data of the voltage signals are actual value data of the amplitudes of the reference signal (first voltage signal) and the measured signal (second voltage signal) which are led into a voltage measurement loop of the measured analog input type electronic transformer calibrator. Therefore, the accuracy of verifying the analog input type electronic transformer calibrator is further improved. Moreover, the ratio (amplitude) error is calculated according to the amplitude data recorded by the high-precision digital recorder, and the phase error is calculated according to the preset parameter, so that the embodiment does not need to compensate the difference of the phase characteristics (between the first voltage signal and the second voltage signal) of the high-precision digital recorder, and does not need to correct the phase measurement error caused by the hardware delay of the high-precision digital recorder.

In the first and second embodiments, the signal generator and the digital recorder may be connected by a GPIB-USB cable, and the digital recorder and the controller may be connected by a GPIB-USB cable. In some other embodiments, other types of data lines may be used for connection, which is not limited by the present invention.

Therefore, the utility model discloses can realize right the calibration of the voltage measurement return circuit of analog input formula electronic transformer check gauge can realize again the calibration to the current measurement return circuit of analog input formula electronic transformer check gauge, can know from this that its quantity value that is applicable to analog input formula electronic transformer check gauge analog quantity function traces to the source.

The utility model provides a calibration system of analog input formula electronic transformer check gauge's theory of operation as follows: when calibrating the voltage measuring loop of the analog input type electronic transformer calibrator,

under the control of the synchronous trigger signal, according to preset parameters, two signal generators (the first signal generator 110 and the second signal generator 120 in the first embodiment) are adopted to generate two paths of first voltage signals and two paths of second voltage signals respectively;

under the control of a high-stability time base synchronous sampling signal, a first digital recorder 210 is adopted to collect one of the two paths of first voltage signals to obtain amplitude data of the first voltage signals;

meanwhile, under the control of the high-stability time-base synchronous sampling signal, a second digital recorder 220 is adopted to collect one of the two paths of second voltage signals to obtain amplitude data of the second voltage signals;

calculating the amplitude data of the first voltage signal and the amplitude data of the second voltage signal by using a controller 400 to obtain a ratio error standard value between the first voltage signal and the second voltage signal, and calculating according to the preset parameters to obtain a phase error standard value between the first voltage signal and the second voltage signal;

the other one of the two paths of the first voltage signal and the other one of the two paths of the second voltage signal are respectively and correspondingly introduced into two analog quantity channels in a voltage measurement loop 310 of a verified analog quantity input type electronic transformer calibrator, and the verified analog quantity input type electronic transformer calibrator calculates according to the received first voltage signal and the received second voltage signal to obtain a ratio error measurement value and a phase error measurement value between the first voltage signal and the second voltage signal;

and comparing the ratio error standard value with the ratio error measured value, and comparing the phase error standard value with the phase error measured value to obtain a calibration result.

The utility model provides an analog input formula electronic transformer check gauge's calbiration system's theory of operation still includes: when a current measuring loop of the analog input type electronic transformer calibrator is calibrated, under the control of a synchronous trigger signal, one signal generator (a first signal generator 110) of two signal generators is adopted to generate a first voltage signal according to a preset parameter; the other of the two signal generators (second signal generator 120) is used to generate a second voltage signal, and a transconductance amplifier 500 is used to convert the second voltage signal into a current signal.

And under the control of a high-stability time base synchronous sampling signal, acquiring the first voltage signal by adopting a first digital recorder to obtain amplitude data of the first voltage signal.

And simultaneously, acquiring the second voltage signal by adopting a second digital recorder under the control of the high-stability time base synchronous sampling signal to obtain amplitude data of the second voltage signal.

And converting the amplitude data of the second voltage signal by adopting a controller according to the transconductance coefficient of the transconductance amplifier to obtain the amplitude data of the current signal, and calculating according to the amplitude data of the current signal and the amplitude data of the first voltage signal to obtain a ratio error standard value between the first voltage signal and the current signal.

And the controller also calculates according to the preset parameters and the transconductance coefficient to obtain a standard value of the phase error between the first voltage signal and the current signal.

The first voltage signal and the current signal are respectively and correspondingly introduced into a voltage measurement loop and a current measurement loop of a verified analog input type electronic transformer calibrator, and the verified analog input type electronic transformer calibrator calculates according to the received first voltage signal and the received current signal to obtain a ratio error measurement value and a phase error measurement value between the first voltage signal and the current signal; and comparing the ratio error standard value with the ratio error measured value, and comparing the phase error standard value with the phase error measured value to obtain a calibration result.

In addition, the calibration process of the analog input type electronic transformer calibrator can be automatically completed through a software program, that is, specifically, the calibration process can be realized through the controller 400, for example, the controller 100 includes a memory and a processor, and the memory is used for storing a computer program; the processor is configured to implement the calibration process described above when executing the program stored in the memory.

Specifically, when the controller 400 is an upper computer, the upper computer sends automatic control commands to all the signal generators and all the high-precision digital recorders through connecting wires; the matched computer program and industrial personal computer are mainly used for sending control commands, configuring instruments, receiving data, processing data, displaying important results such as ratio difference and phase difference.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

To sum up, 1) the utility model discloses a calibration system of analog input formula electronic transformer check gauge is provided, include: the device comprises a first signal generator, a second signal generator, a first digital recorder, a second digital recorder and a controller; the first signal generator generates and outputs a first voltage signal according to a preset parameter under the control of the synchronous trigger signal; the second signal generator generates and outputs a second voltage signal according to preset parameters under the control of the synchronous trigger signal; the first digital recorder samples the first voltage signal under the control of a high-stability time base synchronous sampling signal to obtain and output amplitude data of the first voltage signal; the second digital recorder samples the second voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the second voltage signal; the controller calculates the received amplitude data of the first voltage signal and the received amplitude data of the second voltage signal to obtain a ratio error standard value between the first voltage signal and the second voltage signal; and calculating according to preset parameters to obtain a phase error standard value between the first voltage signal and the second voltage signal. Therefore, the utility model provides a calibration system of analog input formula electronic transformer check gauge can be used for calibrating the analog quantity function of analog input formula electronic transformer check gauge, satisfies its quantity value demand of tracing to the source, has promoted measuring capability and characteristic of tracing to the source, just first digital record appearance with the sampling is triggered by the synchronous sampling signal of external high stable time base to the second digital record appearance, improves the sampling synchronism of two digital record appearance, can accurately confirm first voltage signal with ratio (amplitude) error and phase error between the second voltage signal, improved right the check-up capability of analog input formula electronic transformer check gauge to and the degree of accuracy of check-up result or the uncertainty that has reduced the testing result.

3) The utility model provides a first signal generator and second signal generator are voltage signal generator, can know from this, the utility model discloses can make full use of the high steady and the high degree of accuracy's of first signal generator and second signal generator time base characteristic makes first voltage signal with second voltage signal's phase adjustment can reach high resolution ratio and precision, and from this, it has further improved the check-up the degree of accuracy of analog input formula electronic transformer check-up appearance.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

Claims

1. The utility model provides a calibration system of analog input formula electronic transformer check gauge which characterized in that includes:

2. The calibration system of the analog input electronic transformer calibrator of claim 1, further comprising: when a voltage measurement loop of the analog input type electronic transformer calibrator is calibrated, the first voltage signal and the second voltage signal are respectively transmitted to a voltage measurement loop of the calibrated analog input type electronic transformer calibrator, and the calibrated analog input type electronic transformer calibrator measures the first voltage signal and the second voltage signal to obtain a ratio error measurement value and a phase error measurement value between the first voltage signal and the second voltage signal.

3. The system of claim 1, further comprising, when calibrating the current measurement loop of the analog-to-digital converter calibrator: and the transconductance amplifier is used for correspondingly converting the first voltage signal or the second voltage signal into a current signal and outputting the current signal.

4. The calibration system for an analog input electronic transformer calibrator according to claim 3,

the first digital recorder samples the first voltage signal under the control of the high-stability time-base synchronous sampling signal to obtain and output amplitude data of the first voltage signal;

5. The calibration system of the analog input electronic transformer calibrator of claim 4, further comprising: and the current signal obtained by converting the first voltage signal and the second voltage signal is respectively and correspondingly transmitted to a voltage measuring loop and a current measuring loop of the calibrated analog input type electronic transformer calibrator, and the calibrated analog input type electronic transformer calibrator calculates the first voltage signal and the current signal to obtain a ratio error measurement value and a phase error measurement value between the unconverted voltage signal and the current signal.

6. The calibration system of an analog-to-digital converter as set forth in claim 4, wherein said controller is an upper computer, and further configured to display a ratio error criterion value and a phase error criterion value between said first voltage signal and said second voltage signal, and a ratio error criterion value and a phase error criterion value between said unconverted voltage signal and said current signal.

7. The system of claim 6, wherein the host computer is further configured to continuously adjust the amplitude and phase between the first voltage signal and the second voltage signal outputted from the first signal generator and the second signal generator respectively in real time.

8. The calibration system of the analog input electronic transformer calibrator according to any one of claims 1 to 7, wherein the first signal generator and the second signal generator are both voltage signal generators.

9. The system for calibrating an analog-to-digital converter tester as recited in claim 7, wherein a clock output terminal of one of said first signal generator and said second signal generator is connected to a clock input terminal of the other signal generator, and wherein a clock signal generated by one of said signal generators is inputted into the other signal generator, so that said first voltage signal and said second voltage signal generated by said first signal generator and said second signal generator are clocked together.

10. The system for calibrating an analog input electronic transformer calibrator according to claim 7, wherein said first digital recorder and said second digital recorder have a resolution of 28 bits.

11. The calibration system of the analog input electronic transformer calibrator of claim 8, wherein said predetermined parameters include an amplitude, a frequency and a trigger state for controlling the voltage signals generated by said first and second signal generators; and a range and sampling mode of the first digital recorder and the second digital recorder.