CN108776245A - It is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation - Google Patents
It is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation Download PDFInfo
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- CN108776245A CN108776245A CN201810311399.3A CN201810311399A CN108776245A CN 108776245 A CN108776245 A CN 108776245A CN 201810311399 A CN201810311399 A CN 201810311399A CN 108776245 A CN108776245 A CN 108776245A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses it is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, described device includes：Embedded software hardware system, automatic control system, signal sampling system, FPGA module, adjustable amplitude phase modulation position circuit and signal amplification circuit, voltage turn current module, boosting mutual inductor, up-flow mutual inductor, multiple voltage transformers, multiple current transformers, isolation module, polar coordinate system conversion module, electric current and turn voltage module；It solves existing for existing mutual-inductor tester calibrating installation insufficient, solves current device and produce by 90 ° of phase shifters, raw orthogonal component signal, when frequency adjusting leads to the problem of additive error and nonlinear, and output accuracy is higher.
Description
Technical field
The present invention relates to calibrating installation fields, and in particular, to one kind can a variety of principle transducer checks of automatic calibration
The calibrating installation of instrument.
Background technology
It is domestic at present there are about up to ten thousand mutual-inductor testers are in use, and according to《Measurement Law detailed rules for the implementation》It is required that this
A little mutual-inductor testers must implementation cycle calibrating.Domestic each provincial metering institute undertakes all mutual-inductor testers with DianKeYuan
Transmission of quantity value and for the first time bid are examined and determine, and workload is very big.At present with traditional mutual inductor school based on exchange ratio standard
Instrument calibrating installation is tested, by adjusting with different ratio differences and angular difference is mutually directly exported with orthogonal dial, substantially in accuracy
Reach 0.2 grade.Due to being that manual operation lacks automation and information-based means, gradually by the various digitized instrument institutes of a new generation
It eliminates.
With the economic development of country, scientific and technological progress has more new high-tech equipments to come into operation, as electronic type is mutual
Sensor tester and secondary voltage drop.When this new equipment is traced to the source with traditional transformer calibrating device calibrating, many can be encountered
New problem.
There is the mutual-inductor tester calibrating installation that producer has developed automation in the country at present, but has the following problems：(1)
Due to generating orthogonal component signals for 90 ° by analog phase shifter phase shift using by in-phase component signal, in output source frequency shift
When, 90 ° of analog phase shifters will change phase, influence the accuracy of output, so output is fixed frequency output, cannot meet inspection
Set pattern range request, (2) output design that the measurement feedback of high precision and adjusting do not export, debugging when by manufacture meet technology
Index, stability when in use can not be examined, can only be in periodic calibration and using the stabilization of other methods ability checking device
Property.(3) the Δ u and Δ i of all mutual-inductor tester calibrating installations used are by signal phase and U all the way at present
It is consistent with the phase of I and generates in-phase component signal, in addition in-phase component signal is passed through 90 ° of phase shifter phase shift by signal all the way
Orthogonal component signal is generated, is superimposed and exports by adder, then exported again through isolation transformer.Such generation model, when
When one in two signals of in-phase component or quadrature component amount very little, the angle between two signals of in-phase component and quadrature component
Sine value be similar to the angle value of their angle, mutual-inductor tester calibrating installation traditional at this time examines and determine traditional mutual inductance
Device tester and secondary voltage drop and electronic transducer calibration instrument can obtain preferably examining and determine data.But work as in-phase component
When all big with two signals of quadrature component, the sine value of included angle between them and their angles just not approximately equal, angle
Angle is bigger, and difference is bigger and difference presentation is non-linear, it is impossible to be used in examines and determine the pressure fall-off test instrument and electronics of the direct method of measurement
Formula mutual-inductor tester.
Invention content
The present invention provides it is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, solve existing
Mutual-inductor tester calibrating installation existing for it is insufficient, solve current device and produce by 90 ° of phase shifters, raw quadrature component is believed
Number, frequency leads to the problem of additive error and nonlinear when adjusting, and output accuracy is higher.
For achieving the above object, this application provides one kind can meet simultaneously the traditional mutual-inductor tester of calibrating,
The calibrating installation of secondary pressure drop tester and electronic transducer calibration instrument.
Device using modern surveying control technology by realizing high the degree of automation, high integration, high accuracy, high stability
Measure and control device, device by LINUX embedded softwares hardware system, automatic control system, High Accuracy A D sampled measurements feed back
Module, several precision current transformers, rectangular coordinate system, polar coordinate system switching software module, is led to several accurate voltage mutual inductors
Believe the compositions such as interface and stipulations conversion module, electrooptic conversion module.
Differential pressure (Δ u) and the difference stream (generation model of Δ i) are equipped in device：By digit synthesis and adjust two road signs of generation
Quasi- voltage (U1) and normalized current (I1) signal, the standard mutual inductor output signal in practical calibrating is simulated, two-way subject electricity is generated
Press (U2) and subject electric current (I2) signal, the tested mutual inductor output signal in practical calibrating is simulated, mutual inductor is examined and determine according to conventional
Wiring generate differential pressure (Δ u) and difference stream (Δ i) signals.
The setting value that device is exported according to the ratio difference and angular difference of setting, U is obtained by calculating ratio difference and angular difference2And U1, I2With
I1Between included angle, determine the phase shift code value that Δ u and Δ i needs, then by calculating ratio difference and angular difference with U1And I1Width
Value, determines U2And I2Amplitude and phase, U1、I1、U2And I2Amplitude and phase generated by independent Waveform of Numeral Compounding, solve
With nonlinearity erron of phase when big and adjusts frequency influence and export accuracy problems.
Device uses high-resolution phase adjustment techniques.In order to meet the high-resolution phase adjusted of 10-7, adopt
With the range-adjusting by adjusting horizontal component and quadrature component, phase techniques are adjusted, are passed through by high speed photo coupling shielding system
Data/address bus becomes A horizontal component B quadrature component two-way by D/A ALT-CH alternate channels respectively and exchanges reference signal, believes AB two-way
Number carry out range-adjusting, adjust phase, using power amplifier, Voltage-current conversion circuit is switched by output range control module
Suitable high-precision mutual inductor isolation output.
Device uses high accuracy and measures feedback technique.The U of output1And U2, I1And I2Turn potential circuit by electric current to send
Enter AD and use module, the ratio difference and angular difference value of reality output are calculated using Fourier techniques, feedback data is adjusted to microprocessor
Section output, dial gauge measurement result are used for carrying out the adjustment to operation source amplitude, adjust resolution ratio and are better than 10-7.Than difference and angular difference
Result be used for difference source carry out amplitude and phase adjustment, amplitude adjust resolution ratio be better than 10-7, phase adjusted resolution ratio is excellent
In 0.0001 point, the amplitude accuracy of the output of operation source is better than 0.02%, and the amplitude accuracy of the output in difference source is better than
0.02% and phase accuracy be better than 0.05 point.Ensure 0.1% accuracy of overall output.
Device can effectively be met using rectangular coordinate system and polar coordinate system conversion to be designed under two kinds of different coordinate-systems
The accuracy transfer demand of instrument.When calibrating tradition mutual-inductor tester, is exported using rectangular coordinate system, examine and determine the direct method of measurement
Pressure fall-off test instrument and electronic transducer calibration instrument when, exported using polar coordinate system.
The present invention can examine and determine traditional mutual-inductor tester, pressure fall-off test instrument and electronic transducer calibration instrument, configuration
Protocol converter supports IEC61850-9-2LE and FT3 stipulations, supports the calibrating of digital quantity input electronic transducer calibration instrument.
It is configured with 485, USB and RS232 interface, mutual-inductor tester data access is supported, error testing point is matched in computer
The calibrating of mutual-inductor tester can be automatically performed by postponing.
Compared with prior art, beneficial effects of the present invention are：
1. using the generation model and FPGA technology of new Δ u and Δ i, two-way amplitude and the accurate adjustable number of phase are designed
Word programme-controlled signal source, the U that two-way synchronous digital signal generates1And U2Frequency can be adjusted in synchronism, solve current device and pass through
90 ° of phase shifter productions.Raw orthogonal component signal, frequency lead to the problem of additive error and nonlinear when adjusting.
2. using high-resolution phase regulation technology and automatic measurement feedback compensation technique, solves the stabilization of device output
Property, accuracy, object adaptability problem, amplitude adjust resolution ratio be better than 10-7, phase adjusted resolution ratio is better than 0.0001 point, work
The amplitude accuracy for making the output in source is better than 0.02%, and the amplitude accuracy of the output in difference source is better than 0.02% and phase is accurate
Degree is better than 0.05 point.Ensure 0.1% accuracy of overall output.Reach domestic highest level.
3. can effectively meet the instrument designed under two kinds of different coordinate-systems using rectangular coordinate system and polar coordinate system conversion
The accuracy transfer demand of device.One equipment can examine and determine traditional mutual-inductor tester, pressure fall-off test instrument and electronic mutual inductor
Tester has saved equipment acquisition cost.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 apparatus system schematic diagrams；
Fig. 2 signal source amplitude Principles of Regulation block diagrams；
Fig. 3 information source amplitude phase Principles of Regulation block diagrams；
Fig. 4 tradition mutual-inductor tester voltage errors examine and determine wiring diagram；
Fig. 5 tradition mutual-inductor tester current errors examine and determine wiring diagram；
Fig. 6 analog input electronic transducer calibration instrument voltage errors examine and determine wiring diagram；
Fig. 7 digital quantities input electronic transducer calibration instrument voltage error and examine and determine wiring diagram；
Fig. 8 analog input electronic transducer calibration instrument current errors examine and determine wiring diagram；
Fig. 9 digital quantities input electronic transducer calibration instrument current error and examine and determine wiring diagram.
Specific implementation mode
The present invention provides it is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, solve existing
Mutual-inductor tester calibrating installation existing for it is insufficient, solve current device and produce by 90 ° of phase shifters, raw quadrature component is believed
Number, frequency leads to the problem of additive error and nonlinear when adjusting, and output accuracy is higher.
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Please refer to Fig.1-Fig. 9, this application provides it is a kind of can a variety of principles of automatic calibration mutual-inductor tester inspection
Determine device, principle is as shown in Figure 1, include：LINUX embedded softwares hardware system, automatic control system, FPGA module, high score
Resolution amplitude modulation value tune phase circuit turns current module, power supply mould with signal amplification circuit, AD sampled measurements feedback module, voltage
It is block, several accurate voltage mutual inductors, several precision current transformers, output range handover module, high speed photo coupling shielding system, straight
Angular coordinate system, polar coordinate system software conversion module, communication interface module, electrooptic conversion module and stipulations conversion module etc..
Wherein, one of those is defeated for the LINUX embedded softwares hardware system output end and the automatic control system
Enter end to be connected；The FPGA module is connected by data/address bus with the automatic control system；The AD samples mould
Block is connected by data/address bus and the FPGA module；The power module is other all system power supplies.Pass through insertion
Formula liquid crystal display systems is obtained by the information than declinate difference and percentage tabular value etc. of test examination instrument, according to rectangular coordinate system and polar coordinates
The setting of system, FPGA module is generated exchanges base by automatic control system by the two-way for having phase relation that data processing obtains
Quasi- voltage signal changes the amplitude of two-way ac reference voltage signal using width-adjustable circuit, by automatic control system
The two paths of signals that control signal will be fed into turns current-mode by power amplifier, boosting mutual inductor, accurate voltage mutual inductor, voltage
It is output to tested equipment again after block, up-flow mutual inductor, precision current transformer, signal sampling system is again by the phase of two paths of signals
Amplitude turns the data transmission that potential circuit samples by isolation module and electric current and is handled to automatic control system, place
Data after reason carry out display reality output as a result, automatic printing calibrating original record and calibrating by embedded type liquid crystal display system
Certificate.
Further operation source and difference of the present invention source generates principle：By digit synthesis and adjust two tunnel standard electrics of generation
Press (U1) and normalized current (I1) signal, the standard mutual inductor output signal in practical calibrating is simulated, two tunnels is generated and is tested voltage
(U2) and subject electric current (I2) signal, the tested mutual inductor output signal in practical calibrating is simulated, according to conventional calibrating mutual inductor
Wiring generates differential pressure (Δ u) and difference stream (Δ i) signals.
According to the setting value that the ratio difference and angular difference of setting export, U is obtained by calculating ratio difference and angular difference2And U1,I2And I1It
Between included angle, determine the phase shift code value that Δ u and Δ i needs, then by calculating ratio difference and angular difference with U1And I1Amplitude, really
Determine U2And I2Amplitude and phase, U1、I1、U2And I2Amplitude and phase generated by independent Waveform of Numeral Compounding, solve with
Nonlinearity erron and adjusting frequency influence when phase is big export accuracy problems.
The output in operation source and difference source is all connected to real-time measuring circuit, gives measurement feedback to CPU (stm32), root
Difference is obtained according to setting value, the controlling value of adjusting amplitude and phase ensures the accurate of source output.
Further the present invention uses the adjustable magnitude circuit of high-resolution and signal amplification circuit, and principle is as shown in Fig. 2, utilize
B (16 D/A) generates analog signal with E (12 D/A) and is added, and is supplied to the reference voltage of the C (16 D/A) of Waveform composition,
FPGA generates Wave data to C by parallel bus, ensure that the amplitude of signal source adjusts resolution ratio and is better than 10-7。
Further the present invention uses high-resolution adjustable phase circuit and signal amplification circuit, and principle is as shown in figure 3, first
2 amplitude horizon adjustable components and quadrature component are generated using the adjustable magnitude circuit of high-resolution and signal amplification circuit, as B
The reference voltage of (24 D/A) and D (24 D/A) generate amplitude by FPGA parallel bus and adjust data to B and D, passes through mould
Quasi- adder C synthesizes the adjustable difference signal of high-resolution phase.The calculating of 2 amplitudes is as follows：
Assuming that signal mathematic(al) representation is：
U2=Um2cos(ωt+θ) (1)
It is obtained after trigonometric function expansion：
U2=Um2cosωt cosθ-Um2sinωt sinθ (2)
A=cos θ B=-sin θ are enabled, formula (2) is brought into and obtains：
U2=AUm2cosωt+BUm2sinωt (3)
Initial phase is：
θ=π-arctg (B/A) (4)
A and B meets following relationship
A2+B2=1 (5)
Therefore, A and B values are adjusted by circuit shown in Fig. 3 to obtain the adjustable signal U2 of high-precision phase position.
The real-time technology for measuring feedback compensation that the further present invention uses, includes the electricity of a certain number of high accuracies
Pressure, current transformer, I/O port are made of the channel to channel adapter, programmable amplifier, high-precision AD conversion chip that are linked in sequence, are led to
It crosses data/address bus with FPGA module to be connected, A/D values calculate the ratio difference and angular difference value of reality output, feedback by Fourier techniques
Data are used for carrying out the adjustment to operation source amplitude to microprocessor, by operation source measurement result, than the result of difference and angular difference
For carrying out the adjustment of amplitude and phase to difference source so that long-time stability and object adaptability are greatly improved.Amplitude
It adjusts resolution ratio and is better than 10-7, better than 0.0001 point, the amplitude accuracy of the output of operation source is better than phase adjusted resolution ratio
0.02%, the amplitude accuracy of the output in difference source is better than 0.02% and phase accuracy is better than 0.05 point.Ensure overall output
0.1% accuracy.
The rectangular coordinate system and polar coordinate system that the further present invention uses are converted to realize the mutual inductor of calibrating different principle
Tester is exported using rectangular coordinate system when examining and determine traditional mutual-inductor tester, examines and determine the wireless pressure fall-off test of the direct method of measurement
When instrument and electronic transducer calibration instrument, exported using polar coordinate system.
(1)) rectangular coordinate system output source is used to examine and determine traditional mutual-inductor tester
Assuming that in voltage transformer test function, normal voltage U1, difference voltage is Δ U, is f than difference
(%),
Angular difference is δ ('), and the difference in magnitude of two signal sources output should meet：
The phase difference of two signal sources should meet：
(2) the wireless pressure fall-off test instrument of polar coordinate system output source calibrating work(and electronic transducer calibration instrument are used
Standard AC voltage signal U is generated using polar coordinate system1=Um1Cos (ω t), with standard AC voltage signal U1Together
The proportional dephased difference voltage signal U of step2=U1+ Δ U=Um2cos(ωt+θ)。
Calibrating installation provided by the invention is mutual indepedent using two-way, the adjustable analog signal output of phase-amplitude, electricity
Road is simple, and failure rate is low, and accuracy is high, and stability is good, has a wide range of application, and can effectively meet two kinds of different coordinate-systems and divide into
The precision of the instrument of meter transmits demand.
The specifically used method of the present invention is as follows.When traditional mutual-inductor tester voltage error calibrating, what the present invention exported
A2 and a1 carries out short circuit, n1 and n2 terminals are linked into traditional mutual-inductor tester K, D terminal, standard voltage signal a1 and n1 terminal
Traditional mutual-inductor tester A, X terminal of access, to realize the calibrating of traditional mutual-inductor tester voltage error.
When the calibrating of traditional mutual-inductor tester current error, normalized current of the present invention and subject current polarity end k1 and s1 into
The difference stream of row short circuit, formation is linked into traditional mutual-inductor tester K terminals, normalized current and subject electric current nonpolarity terminal by k1
The traditional mutual-inductor tester T of k2, s2 access0、TxTerminal, to realize the calibrating of traditional mutual-inductor tester current error.It is secondary
Connection principle is consistent with traditional mutual-inductor tester when pressure fall-off test instrument is examined and determine.
Electronic transducer calibration instrument subject signal path is generally divided into digital quantity input and analog input.To analog quantity
When inputting electronic transducer calibration instrument calibrating, simulated what the present invention exported by trial signal access electronic transducer calibration instrument
Input channel is measured, the standard signal that the present invention exports accesses electronic transducer calibration instrument standard volume input channel, to realize
The calibrating of small analog input electronic transducer calibration instrument.
Digital quantity input channel generally supports the optical signal of IEC61850-9-2LE or FT3 agreements, therefore defeated to digital quantity
When entering electronic transducer calibration instrument calibrating, digital signal all the way is directly generated using FPGA, and utilize protocol conversion device
And electro-optic device, this is converted by trial signal to meet the optical signal of IEC61850-9-2LE or FT3 agreements, to realize
Digital quantity inputs the calibrating of electronic transducer calibration instrument.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. it is a kind of can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, which is characterized in that described device includes：
Embedded software hardware system, automatic control system, signal sampling system, FPGA module, adjustable amplitude phase modulation position circuit
It is mutual to turn current module, boosting mutual inductor, up-flow mutual inductor, multiple voltage transformers, multiple electric currents with signal amplification circuit, voltage
Sensor, isolation module, polar coordinate system conversion module, electric current turn voltage module；
By the tested mutual-inductor tester of embedded software hardware system acquisition than declinate difference and dial gauge value information, it is based on right angle
Coordinate system and polar coordinate system, FPGA module generate two with phase relation obtained through data processing by automatic control system
Road ac reference voltage signal changes the amplitude of two-way ac reference voltage signal using adjustable amplitude phase modulation position circuit, by
The two paths of signals that the control signal of automatic control system will be fed into is by signal amplification circuit, boosting mutual inductor, mutual induction of voltage
Device, voltage are output to tested mutual-inductor tester, signal sampling system again after turning current module, up-flow mutual inductor, current transformer
The phase-amplitude of two paths of signals is turned data transmission that voltage module samples to automatic by system by isolation module and electric current again
Networked control systems are handled, and data that treated carry out output verification result by embedded software hardware system.
2. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In device is by digit synthesis and adjusts two tunnel normal voltage U of generation1With normalized current I1Signal simulates the mark in practical calibrating
Quasi- mutual inductor output signal generates two tunnels subject voltage U2With subject electric current I2Signal simulates the tested mutual inductor in practical calibrating
Output signal generates differential pressure Δ u and difference stream Δ i signals according to the wiring of conventional calibrating mutual inductor.
3. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In the setting value that device is exported according to the ratio difference and angular difference of setting obtains U by calculating ratio difference and angular difference2And U1,I2And I1It
Between included angle, determine the phase shift code value that Δ u and Δ i needs, then by calculating ratio difference and angular difference with U1And I1Amplitude, really
Determine U2And I2Amplitude and phase, U1、I1、U2And I2Amplitude and phase generated by independent Waveform of Numeral Compounding.
4. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In, the output in device operation source and difference source is all connected to real-time measuring circuit, by measurement feedback to FPGA module, according to
Setting value obtains difference, the controlling value of adjusting amplitude and phase.
5. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In device uses the range-adjusting by adjusting horizontal component and quadrature component, adjusts phase, passes through by light-coupled isolation system
Data/address bus becomes A horizontal components by D/A ALT-CH alternate channels respectively and exchanges reference signal with B quadrature component two-way, to AB two-way
Signal carries out range-adjusting, adjusts phase, using power amplifier, Voltage-current conversion circuit is cut by output range control module
Change suitable high-precision mutual inductor isolation output.
6. it is according to claim 3 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In the U of device output1And U2, I1And I2Turn voltage module by electric current and be sent into AD using module, is calculated using fourier algorithm
The ratio difference and angular difference value of reality output, feedback data adjust output to microprocessor, and dial gauge measurement result is for carrying out pair
The adjustment of operation source amplitude；Than the adjustment that difference and the result of angular difference are used for carrying out difference source amplitude and phase.
7. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In FPGA module includes：I/O port, UART serial ports, 40M have source crystal oscillator, D/A converting circuit, DC voltage fiducial chip, FPGA
Module generates 3 road ac reference voltage waveforms of frequency, amplitude, phase-adjustable respectively, wherein all the way be used for generate normal voltage,
Electric current, remaining two tunnel are used to generate the horizontal component and quadrature component for adjusting phase.
8. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In adjustable amplitude phase modulation position circuit generates 2 amplitude horizon adjustable components and quadrature component with signal amplification circuit, as digital-to-analogue
The reference voltage for converting B and digital-to-analogue conversion D generates amplitude by FPGA parallel bus and adjusts data to digital-to-analogue conversion B and digital-to-analogue
D is converted, the adjustable difference signal of analog adder C synthesis phases is passed through；The calculating of 2 amplitudes is as follows：
Assuming that signal mathematic(al) representation is：
U2=Um2cos(ωt+θ) (1)
It is obtained after trigonometric function expansion：
U2=Um2cosωtcosθ-Um2sinωtsinθ (2)
A=cos θ B=-sin θ are enabled, formula (2) is brought into and obtains：
U2=AUm2cosωt+BUm2sinωt (3)
Initial phase is：
θ=π-arctg (B/A) (4)
A and B meets following relationship：
A2+B2=1 (5)
Wherein, Um2It is the amplitude of signal, ω is angular frequency, and θ is starting phase angle.
9. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In device is equipped with voltage, current transformer, I/O port, based on the channel to channel adapter, programmable amplifier, AD conversion core being linked in sequence
Piece is connected by data/address bus with FPGA module, and A/D values calculate the ratio difference and angular difference of reality output by fourier algorithm
Value, feedback data is used for carrying out the adjustment to operation source amplitude to FPGA module, by operation source measurement result, than difference and angular difference
Result be used for difference source carry out amplitude and phase adjustment.
10. it is according to claim 1 can a variety of principle mutual-inductor testers of automatic calibration calibrating installation, feature exists
In the rectangular coordinate system and polar coordinate system that device uses are converted to realize that the mutual-inductor tester of calibrating different principle, calibrating pass
When system mutual-inductor tester, exported using rectangular coordinate system, wireless pressure fall-off test instrument and the electronic type for examining and determine the direct method of measurement are mutual
When sensor tester, exported using polar coordinate system；
Traditional mutual-inductor tester is examined and determine using rectangular coordinate system output source：
Assuming that in voltage transformer test function, the difference in magnitude of two signal source outputs meets：
The phase difference of two signal sources meets：
Wherein, U1For normal voltage amplitude, Δ U is difference voltage amplitude, and f (%) is than difference, and δ (') is for angular difference；
Using the wireless pressure fall-off test instrument of polar coordinate system output source calibrating work(and electronic transducer calibration instrument：
Standard AC voltage signal U is generated using polar coordinate system1=Um1Cos (ω t), with standard AC voltage signal U1Synchronous
Proportional dephased subject voltage signal U2=U1+ Δ U=Um2cos(ωt+θ)。
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