CN215494086U - Error calibration device of differential voltage transformer - Google Patents
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Abstract
The utility model discloses an error checking device of a differential voltage transformer, which comprises: the voltage source module outputs voltage signals to the standard voltage transformer and the tested voltage transformer; a differential pressure taking module determines a differential pressure signal according to the secondary voltage signal of the standard voltage transformer and the secondary voltage signal of the measured voltage transformer; the acquisition module acquires the differential pressure signal and a secondary voltage signal of a standard voltage transformer; and the upper computer determines the error of the measured voltage transformer according to the acquired differential pressure signal and the secondary voltage signal of the standard voltage transformer. According to the utility model, a differential pressure signal is obtained by a voltage difference value between the standard voltage transformer and the measured voltage transformer through the precise differential pressure taking module, and is provided for an upper computer through the acquisition module to automatically calculate the error of the voltage transformer, so that the error checking precision within the range of 50Hz-2500Hz is ensured to be within 1PPM while automatic measurement is realized, and the accuracy of digital error measurement is improved while automatic measurement is satisfied.
Description
Technical Field
The utility model relates to the technical field of voltage transformer calibration, in particular to an error calibration device of a differential measurement type voltage transformer.
Background
The error checking technology of the voltage transformer is an important component in the voltage proportion standard value tracing technology. The core equipment in the measuring system is a mutual inductor calibrator which has high measuring accuracy, but the measurement must be carried out manually due to the principle limit value. The digital calibrator can realize automatic error measurement, but the measurement accuracy is lower, can't be accurate carry out the test of high accuracy voltage transformer error.
Disclosure of Invention
The utility model provides an error checking device of a differential measurement type voltage transformer, which aims to solve the problem of accurately checking the error of the voltage transformer.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided an error checking apparatus of a differential type voltage transformer, the apparatus including:
the voltage source module is connected with the first primary side of the standard voltage transformer and the primary side of the tested voltage transformer and is used for outputting voltage signals to the standard voltage transformer and the tested voltage transformer;
the differential pressure acquisition module is connected with the secondary side of the standard voltage transformer, the secondary side of the measured voltage transformer and the acquisition module, and is used for determining a differential pressure signal according to the secondary voltage signal of the standard voltage transformer and the secondary voltage signal of the measured voltage transformer and inputting the differential pressure signal to the acquisition module;
the acquisition module is connected with the secondary side of the standard voltage transformer and the upper computer, and is used for acquiring the differential pressure signal and the secondary voltage signal of the standard voltage transformer and sending the differential pressure signal and the secondary voltage signal to the upper computer;
the upper computer is used for determining the error of the measured voltage transformer according to the acquired differential pressure signal and the secondary voltage signal of the standard voltage transformer;
wherein, each module is connected with the upper computer through a test wire with a good equipotential shielding function.
Preferably, the voltage source module comprises: the signal generator, the power amplifier and the booster are connected in sequence; wherein the content of the first and second substances,
the signal generator generates a low-voltage signal, and performs boosting through the power amplifier and the booster to output the voltage signal.
Preferably, the differential pressure taking module comprises: the resistance sampling differential pressure unit, the signal amplification unit and the signal conditioning unit are sequentially connected; wherein the content of the first and second substances,
the resistance differential pressure taking unit is used for outputting a differential pressure initial signal to the signal amplifying unit according to a secondary voltage signal of the standard voltage transformer and a secondary voltage signal of the voltage transformer to be detected;
the signal amplification unit is used for amplifying the differential pressure initial signal to obtain a differential pressure amplification signal;
and the signal conditioning unit is used for converting the differential pressure amplification signal into a current signal and then converting the current signal into the differential pressure signal for output.
Preferably, wherein the apparatus further comprises:
a magnetic shielding device; the voltage source module and the differential pressure taking module are arranged in the magnetic shielding device to realize magnetic shielding of the voltage source module and the differential pressure taking module.
Preferably, the circuit structure of the differential pressure taking module comprises: the secondary voltage port Un of the standard voltage transformer is connected with one end of a first resistor R1, the other end of the first resistor R1 is respectively connected with one end of a second resistor R2 and the inverting input end of an amplifier A1, the other end of the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the secondary voltage port Ux of the tested voltage transformer and the non-inverting input end of the first amplifier A1, the output end of the first amplifier A1 is connected with one end of a primary side coil T1 of the current transformer CT, the other end of T1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the analog ground potential, one end of a secondary side coil T2 of the current transformer CT is respectively connected with one end of a resistor R5 and the inverting input end of the second amplifier A2, and the other end of T2 is connected with the input end of the electronic gain compensation unit G; the output end of the G is connected with one end of a secondary side coil T3 of the current transformer CT, the other end of the T3 is connected with the non-inverting input end of a second amplifier a2 and grounded, and the input end of a second amplifier a2 is connected with the other end of a resistor R5 and a differential pressure signal output terminal Uout, respectively.
Preferably, the acquisition module is an N I-PXI data acquisition device.
Preferably, wherein the signal output frequency of the signal generator is determined according to a preset measurement frequency.
Preferably, the signal amplifying unit is a precision operational amplifier OPA 2209.
The utility model provides an error checking device of a differential voltage transformer, which aims to meet the requirement of automatic precise error measurement.A voltage difference value between a standard voltage transformer and a measured voltage transformer is used for obtaining a differential pressure signal through a precise differential pressure taking module and is provided for an upper computer through an acquisition module to automatically calculate the error of the voltage transformer, so that the error checking precision within the range of 50Hz-2500Hz is ensured to be within 1PPM while automatic measurement is realized, and the precision of digital error measurement is improved while automatic measurement is met.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of an error checking apparatus 100 of a differential measurement type voltage transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an error checking apparatus of a broadband differential measurement type voltage transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the principle of precision differential pressure measurement according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of an error checking apparatus 100 for a differential voltage transformer according to an embodiment of the present invention. As shown in fig. 1, in order to meet the requirement of automatic precision error measurement, the error calibration apparatus for a differential measurement type voltage transformer according to the embodiment of the present invention obtains a differential pressure signal from a voltage difference between a standard voltage transformer and a measured voltage transformer through a precision differential pressure taking module, and provides the differential pressure signal to an upper computer through an acquisition module to perform automatic calculation of a voltage transformer error, so that the precision of digital error measurement is improved while the requirement of automatic measurement is met. The error checking device 100 for a differential measurement type voltage transformer provided by the embodiment of the utility model comprises: the device comprises a voltage source module 101, a differential pressure taking module 102, an acquisition module 103 and an upper computer 104; wherein, each module is connected with the upper computer through a test wire with a good equipotential shielding function.
Preferably, the voltage source module 101 is connected to a first primary side of the standard voltage transformer and a primary side of the measured voltage transformer, and is configured to output a voltage signal to the standard voltage transformer and the measured voltage transformer.
Preferably, the voltage source module 101 includes: the signal generator, the power amplifier and the booster are connected in sequence; wherein the content of the first and second substances,
the signal generator generates a low-voltage signal, and performs boosting through the power amplifier and the booster to output the voltage signal.
Referring to fig. 2, an error checking apparatus of a differential measurement type voltage transformer according to an embodiment of the present invention includes: the device comprises a precise voltage source module, a precise standard voltage transformer, a differential pressure taking module, an acquisition module and an upper computer. Wherein, accurate voltage source module includes: the signal generator generates a low-voltage signal, the boosting is completed through the power amplifier and the booster, and the low-voltage signal is output to the standard voltage transformer and the to-be-detected voltage transformer.
Because the weak signal detection device has certain requirements on the stability of signals, a precise power supply with higher amplitude and frequency stability must be used during error checking, and the device has the function of continuously adjusting the frequency, so that the stability of the measured signals can be ensured. The power supply of the high-power amplifier or the high-performance switching power supply can be selected.
Preferably, wherein the signal output frequency of the signal generator is determined according to a preset measurement frequency.
Preferably, the differential pressure taking module 102 is connected to the secondary side of the standard voltage transformer, the secondary side of the measured voltage transformer and the acquisition module, and is configured to determine a differential pressure signal according to the secondary voltage signal of the standard voltage transformer and the secondary voltage signal of the measured voltage transformer, and input the differential pressure signal to the acquisition module.
Preferably, the differential pressure taking module comprises: the resistance sampling differential pressure unit, the signal amplification unit and the signal conditioning unit are sequentially connected; wherein the content of the first and second substances,
the resistance differential pressure taking unit is used for outputting a differential pressure initial signal to the signal amplifying unit according to a secondary voltage signal of the standard voltage transformer and a secondary voltage signal of the voltage transformer to be detected;
the signal amplification unit is used for amplifying the differential pressure initial signal to obtain a differential pressure amplification signal;
and the signal conditioning unit is used for converting the differential pressure amplification signal into a current signal and then converting the current signal into the differential pressure signal for output.
Preferably, the signal amplifying unit is a precision operational amplifier OPA 2209. Preferably, the circuit structure of the differential pressure taking module comprises: the secondary voltage port Un of the standard voltage transformer is connected with one end of a first resistor R1, the other end of the first resistor R1 is respectively connected with one end of a second resistor R2 and the inverting input end of an amplifier A1, the other end of the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the secondary voltage port Ux of the tested voltage transformer and the non-inverting input end of the first amplifier A1, the output end of the first amplifier A1 is connected with one end of a primary side coil T1 of the current transformer CT, the other end of T1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the analog ground potential, one end of a secondary side coil T2 of the current transformer CT is respectively connected with one end of a resistor R5 and the inverting input end of the second amplifier A2, and the other end of T2 is connected with the input end of the electronic gain compensation unit G; the output end of the G is connected with one end of a secondary side coil T3 of the current transformer CT, the other end of the T3 is connected with the non-inverting input end of a second amplifier a2 and grounded, and the input end of a second amplifier a2 is connected with the other end of a resistor R5 and a differential pressure signal output terminal Uout, respectively.
Referring to fig. 2, in the present invention, a differential pressure module includes: the resistance differential pressure unit, the signal amplification unit and the signal conditioning unit. The resistance differential pressure taking unit can output a differential pressure initial signal to the signal amplification unit according to a secondary voltage signal of the standard voltage transformer and a secondary voltage signal of the measured voltage transformer, the signal amplification unit amplifies the differential pressure initial signal to obtain a differential pressure amplification signal and outputs the differential pressure amplification signal to the signal conditioning unit, and the signal conditioning unit converts the differential pressure amplification signal into a current signal and converts the current signal into the differential pressure signal and outputs the differential pressure signal to the data acquisition module. On the other hand, the secondary side of the standard voltage transformer is also connected with a current transformer, and the current transformer is connected to the acquisition module. The acquisition module can acquire the differential pressure signal and a secondary voltage signal of the standard voltage transformer simultaneously.
The low potential of the signal obtained by the first part of measurement is the secondary output of the voltage transformer to be measured, namely, the differential signal is a differential signal, and the rear-end measurement unit can only measure a signal of a single end to the ground, so that the input differential signal needs to be isolated and converted, however, the signal has the characteristic of nonlinearity due to the isolation of the voltage transformer, in order to enable the obtained differential signal to have better linearity, the current transformer is used as a main isolation unit in the part, and the error of voltage conversion into current is reduced by designing an electronic compensation unit, so that the linearity is improved; and then, in the third part, the current signal secondarily output by the current transformer is precisely converted into a voltage signal through an active sampling circuit and is input into a subsequent acquisition card, and the conversion process not only ensures the linearity of the signal, but also realizes isolation, thereby ensuring the precision of measurement and calculation.
The differential pressure taking module adopts an inductionless resistive difference taking mode, and can avoid the introduction of larger sampling errors caused by parasitic inductance or capacitance in the traditional difference taking circuit.
In addition, a signal detection unit is provided before the signal amplification unit. In general, when detection is performed, a measured differential signal is generally in a microvolt level, and noise and interference in a measurement environment are added, so that the difficulty in measuring errors only in a digital acquisition mode is quite large. Therefore, in the present invention, a high-performance weak signal detection module must be used to accurately detect a target signal from a noise signal, and simultaneously, the amplitude and the relative phase of the target signal are measured, so as to obtain the quadrature component and the in-phase component of an error signal.
As shown in fig. 3, the circuit structure of the differential pressure measurement module according to the present invention includes: the secondary voltage port Un of the standard voltage transformer is connected with one end of a first resistor R1, the other end of the first resistor R1 is respectively connected with one end of a second resistor R2 and the inverting input end of an amplifier A1, the other end of the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the secondary voltage port Ux of the tested voltage transformer and the non-inverting input end of the first amplifier A1, the output end of the first amplifier A1 is connected with one end of a primary side coil T1 of the current transformer CT, the other end of T1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the analog ground potential, one end of a secondary side coil T2 of the current transformer CT is respectively connected with one end of a resistor R5 and the inverting input end of the second amplifier A2, and the other end of T2 is connected with the input end of the electronic gain compensation unit G; the output end of the G is connected with one end of a secondary side coil T3 of the current transformer CT, the other end of the T3 is connected with the non-inverting input end of a second amplifier a2 and grounded, and the input end of a second amplifier a2 is connected with the other end of a resistor R5 and a differential pressure signal output terminal Uout, respectively. The resistance of the resistor is small and can be 0.01% of 2M ohm. The type of the signal amplifying unit can be set according to the requirement, for example, the precision operational amplifier OPA 2209.
Preferably, the acquisition module 103 is connected to the secondary side of the standard voltage transformer and the upper computer, and is configured to acquire the differential pressure signal and the secondary voltage signal of the standard voltage transformer and send the signals to the upper computer.
Preferably, the acquisition module is an N I-PXI data acquisition device.
Referring to fig. 2, in the present invention, the acquisition module acquires the secondary voltage signal of the standard voltage transformer through the multi-disc inductive voltage divider. When the acquisition module acquires signals, because sampling of different channels can introduce errors due to gain difference of the channels, the utility model adopts a double-channel switching mode to acquire the signals, and avoids channel difference. The dual-channel switching mode is as follows: in a first acquisition period, acquiring a differential pressure signal by using a first channel, and acquiring a secondary side voltage signal of a standard voltage transformer by using a second channel; then, in a second acquisition period, acquiring a secondary side voltage signal of the standard voltage transformer by using the first channel, acquiring a differential pressure signal by using the second channel, and updating an acquisition sequence once in one period. And finally, integrating the data acquired by the two channels for calculating errors.
Preferably, the upper computer 104 is configured to determine an error of the measured voltage transformer according to the acquired differential pressure signal and a secondary voltage signal of a standard voltage transformer.
In the utility model, the upper computer is a check meter with a built-in broadband voltage transformer check system based on LabVI EW, the check meter mainly comprises a hardware setting module, a data acquisition module, a data processing module, a Fourier analysis algorithm module, a calculation and display module and a data storage and output module, each module is realized by adopting a graphical programming language, the processing and the control of data stream can be realized, the full-automatic processing of error check of the voltage transformer under broadband is realized, and the processing precision and the processing timeliness of data are ensured.
The error value of the tested mutual inductor is obtained through processing and operation of a software algorithm on the upper computer. If the broadband error measurement is to be realized, the software algorithm can automatically identify the frequency with the maximum amplitude value and carry out calculation and display only by modifying the frequency of the output voltage signal of the signal generator into the measured frequency, so that the error checking precision within the range of 50Hz-2500Hz is ensured to be within 1PPM while the automatic measurement is realized.
Preferably, wherein the apparatus further comprises:
a magnetic shielding device; the voltage source module and the differential pressure taking module are arranged in the magnetic shielding device to realize magnetic shielding of the voltage source module and the differential pressure taking module.
Because the error signal is smaller, the test line of the error checking device must use the test line with good equipotential shielding, and meanwhile, the differential pressure device and the calibration signal injection device adopt magnetic shielding measures as much as possible, such as using a metal box with high magnetic permeability and the like.
The error calibration device of the broadband differential measurement type voltage transformer improves the precision of differential measurement, solves the problem of low precision of direct-mining type error measurement by matching with a digital calibration instrument, and improves the precision of differential measurement type error calibration.
The process for carrying out error check by using the error check device of the differential measurement type voltage transformer comprises the following steps: the voltage source module outputs voltage signals to the standard voltage transformer and the tested voltage transformer; a differential pressure taking module determines a differential pressure signal according to the secondary voltage signal of the standard voltage transformer and the secondary voltage signal of the measured voltage transformer, and inputs the differential pressure signal to the acquisition module; the acquisition module acquires the differential pressure signal and a secondary voltage signal of the standard voltage transformer and sends the differential pressure signal and the secondary voltage signal to an upper computer; and the upper computer determines the error of the measured voltage transformer according to the acquired differential pressure signal and the secondary voltage signal of the standard voltage transformer.
The utility model has been described with reference to a few embodiments. However, other embodiments of the utility model than the one disclosed above are equally possible within the scope of the utility model, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (8)
1. An error checking apparatus for a differential type voltage transformer, the apparatus comprising:
the voltage source module is connected with the first primary side of the standard voltage transformer and the primary side of the tested voltage transformer and is used for outputting voltage signals to the standard voltage transformer and the tested voltage transformer;
the differential pressure acquisition module is connected with the secondary side of the standard voltage transformer, the secondary side of the measured voltage transformer and the acquisition module, and is used for determining a differential pressure signal according to the secondary voltage signal of the standard voltage transformer and the secondary voltage signal of the measured voltage transformer and inputting the differential pressure signal to the acquisition module;
the acquisition module is connected with the secondary side of the standard voltage transformer and the upper computer, and is used for acquiring the differential pressure signal and the secondary voltage signal of the standard voltage transformer and sending the differential pressure signal and the secondary voltage signal to the upper computer;
the upper computer is used for determining the error of the measured voltage transformer according to the acquired differential pressure signal and the secondary voltage signal of the standard voltage transformer;
wherein, each module is connected with the upper computer through a test wire with a good equipotential shielding function.
2. The apparatus of claim 1, wherein the voltage source module comprises: the signal generator, the power amplifier and the booster are connected in sequence; wherein the content of the first and second substances,
the signal generator generates a low-voltage signal, and performs boosting through the power amplifier and the booster to output the voltage signal.
3. The apparatus of claim 1, wherein the differential pressure taking module comprises: the resistance sampling differential pressure unit, the signal amplification unit and the signal conditioning unit are sequentially connected; wherein the content of the first and second substances,
the resistance differential pressure taking unit is used for outputting a differential pressure initial signal to the signal amplifying unit according to a secondary voltage signal of the standard voltage transformer and a secondary voltage signal of the voltage transformer to be detected;
the signal amplification unit is used for amplifying the differential pressure initial signal to obtain a differential pressure amplification signal;
and the signal conditioning unit is used for converting the differential pressure amplification signal into a current signal and then converting the current signal into the differential pressure signal for output.
4. The apparatus of claim 1, further comprising:
a magnetic shielding device; the voltage source module and the differential pressure taking module are arranged in the magnetic shielding device to realize magnetic shielding of the voltage source module and the differential pressure taking module.
5. The apparatus of claim 1, wherein the circuit structure of the differential pressure taking module comprises: the secondary voltage port Un of the standard voltage transformer is connected with one end of a first resistor R1, the other end of the first resistor R1 is respectively connected with one end of a second resistor R2 and the inverting input end of an amplifier A1, the other end of the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the secondary voltage port Ux of the tested voltage transformer and the non-inverting input end of the first amplifier A1, the output end of the first amplifier A1 is connected with one end of a primary side coil T1 of the current transformer CT, the other end of T1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the analog ground potential, one end of a secondary side coil T2 of the current transformer CT is respectively connected with one end of a resistor R5 and the inverting input end of the second amplifier A2, and the other end of T2 is connected with the input end of the electronic gain compensation unit G; the output end of the G is connected with one end of a secondary side coil T3 of the current transformer CT, the other end of the T3 is connected with the non-inverting input end of a second amplifier a2 and grounded, and the input end of a second amplifier a2 is connected with the other end of a resistor R5 and a differential pressure signal output terminal Uout, respectively.
6. The apparatus of claim 1, wherein the acquisition module is an NI-PXI data acquisition device.
7. The apparatus of claim 2, wherein the signal output frequency of the signal generator is determined based on a preset measurement frequency.
8. The apparatus of claim 3, wherein the signal amplification unit is a precision operational amplifier (OPA 2209).
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| CN202121458589.1U CN215494086U (en) | 2021-06-29 | 2021-06-29 | Error calibration device of differential voltage transformer |
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| CN202121458589.1U CN215494086U (en) | 2021-06-29 | 2021-06-29 | Error calibration device of differential voltage transformer |
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