CN102435847A - High-precision electrical parameter analyzer - Google Patents
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- CN102435847A CN102435847A CN2011103344695A CN201110334469A CN102435847A CN 102435847 A CN102435847 A CN 102435847A CN 2011103344695 A CN2011103344695 A CN 2011103344695A CN 201110334469 A CN201110334469 A CN 201110334469A CN 102435847 A CN102435847 A CN 102435847A
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Abstract
The invention relates to a high-precision electrical parameter analyzer, more particularly to an electrical parameter analyzer that is applied to a test/ an analysis of an alternating current parameter, calibration on electric energy quality analytical equipment and a scientific research test. The analyzer comprises an analog signal sampler, a three-phase input automatic control circuit, a front end drive circuit, an A/D sampling circuit, an operation control circuit, a display and a host computer. A three-phase detected voltage, a current signal are respectively pass through the analog signal sampler and are input into the three-phase input automatic control circuit; a signal is output by the three-phase input automatic control circuit as well as pass through the front end drive circuit and is transmitted to the A/D sampling circuit; a digital signal is output by the A/D sampling circuit and pass though the operation control circuit; and then, the digital signal is accessed to the display and is displayed by the host computer. According to the invention, various measuring functions can be realized; multiple testing and analyzing functions are realized; the electrical parameter measurement precision is high; harmonic wave analysis precision is high; displayed data are complete; and the analyzer can be operated conveniently.
Description
Technical field
The present invention relates to a kind of electric parameter analyser that is used for ac parameter test/analysis, the calibrating of power quality analysis device, scientific research test.
Background technology
The metering of ac parameter has also comprised the analysis of the qualities of power supply such as frequency analysis except having comprised the measurement to conventional electrical quantities such as voltage, electric current, power, electric energy; All suitable important in every profession and trade for the metering of above-mentioned electrical quantities, so most important for the accurate metering of these values.
Also there are some multi-functional preferably standard scale products in more domestic instrument producers; Its function and performance can not satisfy the requirement to the multifunctional analysis instrument of IEC or national standard, some otherly carry out the frequency analysis analysis than low side power quality analyzer device common FFT or the DFT algorithms of adopting more, and the partial analysis appearance adopts phaselocked loop to realize that frequency-tracking is near accurate synchronized sampling; But tracking effect and measured signal have considerable influence; Analysis precision can only satisfy unskilled labor effect table demand, can not use as standard, can not satisfy enterprise, provincial, and municipal level metering mechanism transmission of quantity value needs; Can only use as rolling inspection and qualitative analysis; So aspect the electric parameter analysis, high-precision analysis meter is also fewer in actual engineering application, domestic enterprise's majority also is to use more external well-known producer products.Abroad just have great advantage more domestic aspect the development of analysis meter; Its technical merit is more leading domestic a lot; Though but also unusual height of the external relatively good price of instrument performance; And after-sales service very inconvenience and maintenance cost is very high, therefore develops the high and multifunction electric parametric analysis appearance that can control cost of class of accuracy and is necessary very much.
Summary of the invention
The object of the invention is intended to overcome the defective of prior art, and the high precision electric parameter that a kind of test analysis function is complete, measuring accuracy is high, video data is complete, easy to operate analyser is provided.
High precision electric parameter analyser of the present invention; Form by simulating signal sampling thief, three-phase input automatic control circuit, front-end driven circuit, A/D sample circuit, arithmetic control circuit, display and host computer; The tested voltage of three-phase, current signal input to three-phase input automatic control circuit through the simulating signal sampling thief respectively; Three-phase input automatic control circuit output signal is delivered to the A/D sample circuit through the front-end driven circuit, and A/D sample circuit output digital signal behind arithmetic control circuit, gets into display and host computer shows.
Described simulating signal sampling thief is made up of MN type resitstance voltage divider, two-stage current transformer, and MN type resitstance voltage divider, two-stage current transformer connect with three-phase input automatic control circuit respectively.
Described three-phase input automatic control circuit is made up of programmable amplifier, multiplexer; The input end of programmable amplifier connects with MN type resitstance voltage divider and two-stage current transformer in the simulating signal sampling thief; The output terminal of programmable amplifier connects with multiplexer, and multiplexer connects with the front-end driven circuit.
Described MN type resitstance voltage divider is made up of resistance in series and parallel resistance, and resistance in series places the noble potential compensating conductor, and resistance in series, noble potential compensating conductor and parallel resistance all place the grounded shield device.
Said resistance in series and parallel resistance are at least two, and the resistance value of each resistance is identical.
Described front-end driven circuit by voltage follower, single-endedly constitute to difference AD driver; The input end of voltage follower connects with the multiplexer of three-phase input automatic control circuit; The output terminal of voltage follower connects to difference AD driver with single-ended, single-endedly connects with the A/D sample circuit to difference AD driver.
Described A/D sample circuit is made up of difference input a/d converter, voltage reference circuit, sequential control circuit; The single-ended of difference input a/d converter and front-end driven circuit connects to difference AD driver; Difference input a/d converter, sequential control circuit connect with arithmetic control circuit, and voltage reference circuit, sequential control circuit connect with the difference input a/d converter.
Described arithmetic control circuit is made up of dsp processor, DDS digital frequency synthesizer; The input end of dsp processor connects with the A/D sample circuit; The output terminal of dsp processor connects with the programmable amplifier and the multiplexer of three-phase input automatic control circuit; The input end of DDS digital frequency synthesizer connects with dsp processor, and the output terminal of DDS digital frequency synthesizer connects with the sequential control circuit of A/D sample circuit.
Described host computer is a kind of in computing machine, PDA, mobile phone, the panel computer, and host computer connects with dsp processor in the arithmetic control circuit through the RS232 serial line interface.
High precision electric parameter analyser of the present invention; DSP is as the main processing chip in utilization; Simulation measured signal input back voltage signal is sampled as six road A/D converter WV signals through high precision MN type resitstance voltage divider, electric current through high precision twin-stage current transformer; Signal is realized from the control of momentum limit through programmable amplifier; Six road signals are converted into two paths of signals through the multiplexer polling; Two paths of signals improves after the input impedance through single-ended through voltage follower and gets into 18 potential differences to the difference AD driver and divide input a/d converter to convert digital signal into; The amplitude that 18 potential differences are divided input a/d converter with reference to provide by reference voltage circuit, SF is synthetic and provide through behind the sequential control circuit by the DDS digital frequency synthesizer; Digital signal after the conversion divides input a/d converter to be sent to dsp processor through 18 potential differences; And carry out information such as amplitude that calculation process calculates to be needed, frequency, phase place by DSP; Wherein non-integer-period Fourier backoff algorithm has been adopted in frequency analysis, cooperates the DDS digital frequency synthesizer to follow the tracks of the measured signal frequency and can significantly improve the frequency analysis precision, according to the amplitude information dsp processor of signal programmable amplifier is controlled realization from the control of momentum limit; According to signal frequency information D SP digital frequency synthesizer is controlled and to be made 18 potential differences divide the input a/d converter SF to remain the integral multiple of measured signal frequency; The result data of handling well is sent to touch liquid-crystal controller through the RS232 serial line interface to dsp processor and host computer shows, while touch type liquid crystal display and host computer are sent to DSP through the RS232 serial line interface with user's input information and handle, and according to these information D SP processor the each several part circuit controlled and realized various different measuring functions.Test analysis function of the present invention is many, the electricity parameter measuring accuracy high, the frequency analysis precision is high, video data is complete, easy to operate.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is the high precision MN type resitstance voltage divider structural representation among the present invention.
Among the figure, 1-simulating signal sampling thief, 2-three-phase input automatic control circuit, 3-front-end driven circuit, 4-A/D sample circuit, 5-arithmetic control circuit, 6-resistance in series, 7-parallel resistance, 8-noble potential compensating conductor, 9-grounded shield device.
Embodiment
Below in conjunction with accompanying drawing the present invention is done explanation further, but be not limited to embodiment.
Embodiment 1
As shown in Figure 1; High precision electric parameter analyser of the present invention; Comprise simulating signal sampling thief, three-phase input automatic control circuit, front-end driven circuit, A/D sample circuit, arithmetic control circuit, display and host computer; MN type resitstance voltage divider, two-stage current transformer constitute the simulating signal sampling thief; MN type resitstance voltage divider is a high precision MN type resitstance voltage divider, and two-stage current transformer is a high precision twin-stage current transformer, and the tested voltage of three-phase, current signal input in the three-phase input automatic control circuit through high precision MN type resitstance voltage divider, high precision twin-stage current transformer respectively; Programmable amplifier, multiplexer constitute three-phase input automatic control circuit; The input end of programmable amplifier connects with high precision MN type resitstance voltage divider and high precision twin-stage current transformer in the simulating signal sampling thief, and two identical resistance in seriess and two identical parallel resistances of above resistance of above resistance constitute high precision MN type resitstance voltage dividers, and are as shown in Figure 2; Resistance in series places the noble potential compensating conductor; Resistance in series, noble potential compensating conductor and parallel resistance all place the grounded shield device, and the output terminal of programmable amplifier connects with multiplexer, and multiplexer connects with the front-end driven circuit; Voltage follower, single-ended to difference AD driver formation front-end driven circuit; The multiplexer of the input end of voltage follower and three-phase input automatic control circuit connects, and the output terminal of voltage follower connects to difference AD driver with single-ended, single-endedly connects with the A/D sample circuit to difference AD driver; Three-phase input automatic control circuit output signal is delivered to the A/D sample circuit through the front-end driven circuit; Difference input a/d converter, voltage reference circuit, sequential control circuit constitute the A/D sample circuit, and the difference input a/d converter connects with the front-end driven circuit, and difference input a/d converter, sequential control circuit connect with arithmetic control circuit; Constitute arithmetic control circuit by dsp processor, DDS digital frequency synthesizer; The input end of dsp processor connects with the A/D sample circuit, and the output terminal of dsp processor connects with the programmable amplifier and the multiplexer of three-phase input automatic control circuit, and the input end of DDS digital frequency synthesizer connects with dsp processor; The output terminal of DDS digital frequency synthesizer connects with the sequential control circuit of A/D sample circuit; Voltage reference circuit, sequential control circuit connect with the difference input a/d converter that A/D sample circuit output digital signal gets into display behind arithmetic control circuit and host computer shows, host computer is a kind of in computing machine, PDA, mobile phone, the panel computer, and host computer passes through the RS232 serial line interface and connects with dsp processor in the arithmetic control circuit.
High precision electric parameter analyser of the present invention; Tested simulating signal converts digital signal by the A/D sample circuit through high-precision analog signal sampler, three-phase after importing automatic control circuit, front-end driven circuit; Digital signal inputs to arithmetic control circuit and carries out computing, analysis; The dsp processor device exports the operational analysis result to display through the RS232 serial line interface and host computer shows, simultaneously according to operation result and display, host computer input three-phase input automatic control circuit is controlled realization from control of momentum limit and three phase input signal pollings.
High precision electric parameter analyser of the present invention, high-precision analog signal sampler comprise high precision MN type resitstance voltage divider, high precision twin-stage current transformer.The sampling accuracy that improves sampling thief for the ac parameter analyser is the prerequisite that improves the test analysis accuracy.High precision MN type resitstance voltage divider has an input point A, an output point B, a common point C; Input point A is a noble potential, and output point B is an electronegative potential, common point C ground connection; Tested simulating signal is exported by output point through at least two resistance in series, two parallel resistance at least; Common point ground connection, the noble potential compensating conductor connects with input point, and the grounded shield device connects with common point; High precision MN type resitstance voltage divider is M precision resistance series connection, a N precision resistance parallel connection of same batch of employing, similar resistance; And adopt the novel voltage divider of noble potential compensation, grounded shield structure, this structure MN type resitstance voltage divider can be increased to 0.0003% with the dividing potential drop precision.High precision twin-stage current transformer adopts twin-stage compensation winding that the angular difference of measured signal is compensated, and improves the accuracy and the phase differential of sampling, makes the current sample precision be increased to 0.005%.
High precision electric parameter analyser of the present invention, three-phase input automatic control circuit comprises programmable amplifier, multiplexer.Programmable amplifier is made up of 6 pga207 programmable amplifiers; This amplifier gain can be set to 1,2,5,10 times through programming; Respectively 1.5-3V, 0.6-1.5V, 0.3V-0.6V, 0.15-0.3V signal are amplified to this A/D converter optimum working zone of 1.5-3V (50-100% of rated operational voltage full scale), reduce the error that the A/D sampling element is introduced.Multiplexer adopts the Maxim multiplexed chip Max309 of company; Realize three road signal multiplexings, reduce A/D converter quantity and simplified circuit that MAX309 is high precision, 8 passages/two 4 passages, high-performance, CMOS analog multiplexer; Polling speed is fast, and distorted signals is little.
High precision electric parameter analyser of the present invention, front-end driven circuit comprise voltage follower, single-ended to difference AD driver.Voltage follower uses the AD845 design, is used to improve input impedance, reduces distorted signals, AD845 be a fast, accurate, N raceway groove JFET input, single-chip operational amplifier, can realize low-down input offset voltage and offset voltage drift performance.Single-endedly utilize differential amplifier AD8138 to realize to difference AD driver; Be used to drive the difference input a/d converter; AD8138 can simplify the differential signal amplification and drive to differential amplifier or difference to differential amplifier as single-ended greatly, adopts the proprietary XFCB bipolar technology of ADI company to make, and-3 dB bandwidth are 320 MHz; Differential signal is provided, and harmonic distortion is minimum in existing differential amplifier.
High precision electric parameter analyser of the present invention, A/D sample circuit comprise that 18 potential differences divide input a/d converter, voltage reference circuit, sequential control circuit.18 potential differences divide input a/d converter to adopt the AD AD7679 of company chip, and AD7679 is the gradual approaching A/D converter that 18 precision resolution of no error code do not have transmission delay, supply power to single group 5V power supply, support serial and parallel system interface.AD7679 difference input range is 5V to the maximum, and the soon high sampling rate of speed is 500kSPS, and power consumption very low when sampling rate is 570kSPS power consumption be merely 76mW.The linearity of AD7679 and dynamic range in ADC of the same type than more excellent, so and owing to approach structure one by one and be easy for frequency multiplexing technique it has more advantage than ADC of the same type on using., its handling capacity is the good maximal value ± 2.5LSB of 570 kSPS integral nonlinearities greatly, at a high speed, the characteristics that make of low-power consumption, good linearity, wide dynamic range can reduce the error that A/D converter is introduced greatly.Reference voltage circuit utilizes AD780 to realize that AD780 is a superhigh precision bandgap voltage reference, can utilize the input of 4.0 V to 36 V that 2.5 V or 3.0 V output are provided.It has low initial error, low temperature drift and hangs down output noise, and can drive the electric capacity of size arbitrarily, therefore is suitable for very much strengthening the performance of high resolution A C.Sequential control circuit adopts TTL chip 74LS121 and 74LS123 to be used for stablizing the synthetic pulse signal of DDS digital frequency synthesizer, for AD provides stable work clock.
High precision electric parameter analyser of the present invention, arithmetic and control unit comprises dsp processor, DDS digital frequency synthesizer.Dsp processor is selected floating type digital signal processor TMS320C6713 for use; Has two-way McBSP interface; Pass through the digital signal that 18 AD transmit after being respectively applied for reception voltage, current sample, the EMIF of TMS320C6713 has very strong interface capability, and data-bus width reaches 32; Addressable space is 4GB; Can with the storer direct interface of present nearly all type, the reading and writing data access speed is the highest can to reach 932MB/s, EMIF is used for expanding peripherals and realizes the control to other parts.The DDS digital frequency synthesizer adopts Direct Digital Frequency Synthesizers DDS special chip AD9850; AD9850 Direct Digital compositor DDS core at a high speed is according to 32 bit frequency control words and 5 phase shift control words of setting; Can produce 0.029Hz to the sine wave signal of 62.5MHz and the square-wave signal of standard, utilization Direct Digital compositor substitutes the conventional analogue phaselocked loop measured signal frequency is followed the tracks of, and guarantees that SF is by the integral multiple of measured frequency; The accuracy of can effectively improve analysis, measuring; The particularly accuracy of frequency analysis, RS232 serial line interface utilize the EMIF mouth of dsp processor to utilize TL16C752B UART Universal Asynchronous Receiver Transmitter UART chip expansion, are used for same LCD, host computer carries out exchanges data; The TL16C752B chip comprises two tunnel separate asynchronism transceivers; Receive and send and respectively be with 64-byte FIFO, and respectively carry the Modem interface signal, maximum transmission rate can reach the 1.5Mbps baud rate.
High precision electric parameter analyser of the present invention; Display adopts touch type liquid crystal display; Carry out exchanges data through RS232 serial line interface and dsp processor, also possess input function, replace the keyboard input of conventional instrument except that possessing Presentation Function; Simple to operate, be convenient to realize various tests, analysis, graphical display function; Host computer is a kind of in computing machine, PDA, panel computer, the mobile phone, carries out exchanges data through RS232 serial line interface and dsp processor, is used to store, management testing, analysis data and utilize auto-control software to realize the automatic control to analyser.
High precision electric parameter analyser of the present invention; Algorithm of harmonics analysis is a non-integer-period Fourier backoff algorithm; This algorithm is through calculating the integer-period sampled complement relevant with the cycle exact value; And then utilize trapezoid formula to calculate compensation matrix according to this complement, and this matrix inversion is calculated the non-integer-period compensation matrix, carry out dot product with this matrix and the Fourier series value of utilizing DFT to calculate; So just can calculate the humorous wave amplitude and the angle values that approach actual value; Utilizing DDS frequency synthesizer realization frequency-tracking and other control devices assurance complement in 0.5, can the accuracy of single harmonic component analysis be brought up to 0.05%, well beyond common harmonic analysis instrument.
High precision electric parameter analyser of the present invention; Can be used as the standard scale use and also can be used as the power quality analyzer use, be used for calibrating and calibrate all kinds of AC energy measurement instruments and power quality analyzer, have the flush type meter operating system of autonomous establishment; Touch input; The interface succinctly comprises and contains much information, and can realize that real-time graph shows, for triphase parameter information shows, multiple harmonic shows, polar plot shows, oscillogram shows the steady display interface is provided.Have the program control management software platform of host computer, implementation part instrument automatic Verification provides the data storage management platform.The signal input range is voltage 0-400V, electric current 0-50A.The measured signal frequency range is 0Hz-1kHz; Voltage, electric current, power test accuracy are 0.02%; The IF harmonic analysis number of times is 50 times, and IF harmonic analysis has also used non-integer-period Fourier backoff algorithm except that utilization DDS realizes that hardware frequency is followed the tracks of; Increase substantially analysis precision, make the single harmonic component measuring accuracy can reach 0.05%.
High precision electric parameter analyser of the present invention; DSP is as the main processing chip in utilization; Simulation measured signal input back voltage signal is sampled as six road A/D converter WV signals through high precision MN type resitstance voltage divider, electric current through high precision twin-stage current transformer; Signal is realized from the control of momentum limit through programmable amplifier; Six road signals are converted into two paths of signals through the multiplexer polling; Two paths of signals improves after the input impedance through single-ended through voltage follower and gets into 18 potential differences to the difference AD driver and divide input a/d converter to convert digital signal into; The amplitude that 18 potential differences are divided input a/d converter with reference to provide by reference voltage circuit, SF is synthetic and provide through behind the sequential control circuit by the DDS digital frequency synthesizer; Digital signal after the conversion divides input a/d converter to be sent to dsp processor through 18 potential differences; And carry out information such as amplitude that calculation process calculates to be needed, frequency, phase place by DSP; Wherein non-integer-period Fourier backoff algorithm has been adopted in frequency analysis, cooperates the DDS digital frequency synthesizer to follow the tracks of the measured signal frequency and can significantly improve the frequency analysis precision, according to the amplitude information dsp processor of signal programmable amplifier is controlled realization from the control of momentum limit; According to signal frequency information D SP digital frequency synthesizer is controlled and to be made 18 potential differences divide the input a/d converter SF to remain the integral multiple of measured signal frequency; The result data of handling well is sent to touch liquid-crystal controller through the RS232 serial line interface to dsp processor and host computer shows, while touch type liquid crystal display and host computer are sent to DSP through the RS232 serial line interface with user's input information and handle, and according to these information D SP processor the each several part circuit controlled and realized various different measuring functions.Test analysis function of the present invention is many, the electricity parameter measuring accuracy high, the frequency analysis precision is high, video data is complete, easy to operate.
Embodiment 2
High precision electric parameter analyser of the present invention, high precision MN type resitstance voltage divider comprise 11 resistance in seriess and 12 parallel resistances that resistance value is identical that resistance value is identical.All the other are with embodiment 1.
High precision electric parameter analyser of the present invention, high precision MN type resitstance voltage divider comprise 13 resistance in seriess and 10 parallel resistances that resistance value is identical that resistance value is identical.All the other are with embodiment 1.
Embodiment 4
High precision electric parameter analyser of the present invention, high precision MN type resitstance voltage divider comprise 22 resistance in seriess and 6 parallel resistances that resistance value is identical that resistance value is identical.All the other are with embodiment 1.
Claims (9)
1. high precision electric parameter analyser; Form by simulating signal sampling thief, three-phase input automatic control circuit, front-end driven circuit, A/D sample circuit, arithmetic control circuit, display and host computer; It is characterized in that; The tested voltage of three-phase, current signal input to three-phase input automatic control circuit through the simulating signal sampling thief respectively; Three-phase input automatic control circuit output signal is delivered to the A/D sample circuit through the front-end driven circuit, and A/D sample circuit output digital signal behind arithmetic control circuit, gets into display and host computer shows.
2. high precision electric parameter analyser according to claim 1; It is characterized in that; Described simulating signal sampling thief is made up of MN type resitstance voltage divider, two-stage current transformer, and MN type resitstance voltage divider, two-stage current transformer three-phase input automatic control circuit respectively connect.
3. high precision electric parameter analyser according to claim 1 and 2; It is characterized in that; Described three-phase input automatic control circuit is made up of programmable amplifier, multiplexer; The input end of programmable amplifier connects with MN type resitstance voltage divider and two-stage current transformer in the simulating signal sampling thief, and the output terminal of programmable amplifier connects with multiplexer, and multiplexer connects with the front-end driven circuit.
4. high precision electric parameter analyser according to claim 1 and 2; It is characterized in that; Described MN type resitstance voltage divider is made up of resistance in series and parallel resistance; Resistance in series places the noble potential compensating conductor, and resistance in series, noble potential compensating conductor and parallel resistance all place the grounded shield device.
5. high precision electric parameter analyser according to claim 1 and 2 it is characterized in that said resistance in series and parallel resistance are at least two, and the resistance value of each resistance is identical.
6. high precision electric parameter analyser according to claim 1; It is characterized in that; Described front-end driven circuit by voltage follower, single-endedly constitute to difference AD driver; The multiplexer of the input end of voltage follower and three-phase input automatic control circuit connects, and the output terminal of voltage follower connects to difference AD driver with single-ended, single-endedly connects with the A/D sample circuit to difference AD driver.
7. high precision electric parameter analyser according to claim 1; It is characterized in that; Described A/D sample circuit is made up of difference input a/d converter, voltage reference circuit, sequential control circuit; The single-ended of difference input a/d converter and front-end driven circuit connects to difference AD driver, and difference input a/d converter, sequential control circuit connect with arithmetic control circuit, and voltage reference circuit, sequential control circuit connect with the difference input a/d converter.
8. according to claim 1 or 7 described high precision electric parameter analysers; It is characterized in that; Described arithmetic control circuit is made up of dsp processor, DDS digital frequency synthesizer; The input end of dsp processor connects with the A/D sample circuit; The output terminal of dsp processor connects with the programmable amplifier and the multiplexer of three-phase input automatic control circuit, and the input end of DDS digital frequency synthesizer connects with dsp processor, and the output terminal of DDS digital frequency synthesizer connects with the sequential control circuit of A/D sample circuit.
9. high precision electric parameter analyser according to claim 1 is characterized in that, described host computer is a kind of in computing machine, PDA, mobile phone, the panel computer, and host computer connects with dsp processor in the arithmetic control circuit through the RS232 serial line interface.
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| CN103576120B (en) * | 2013-11-07 | 2016-09-28 | 国家电网公司 | Third-harmonic component plesiochronous information transfer check and Self-healing Algorithm |
| CN106353578A (en) * | 2016-08-29 | 2017-01-25 | 惠州三华工业有限公司 | Automatic intelligent high-voltage tester |
| CN106645590A (en) * | 2017-01-20 | 2017-05-10 | 中国工程物理研究院总体工程研究所 | Gas concentration measurement device based on differential acquisition |
| CN107942118A (en) * | 2017-11-13 | 2018-04-20 | 国家电网公司 | A kind of multrirange collecting unit, Medium Voltage Switchgear signal pickup assembly and system |
| CN108288371A (en) * | 2017-12-15 | 2018-07-17 | 广州智光自动化有限公司 | Based on the time-multiplexed electric flux synchronous sampling system of bus |
| CN107991529A (en) * | 2017-12-27 | 2018-05-04 | 广东东方电讯科技有限公司 | Non-linear power measures analysis recorder |
| CN112187263A (en) * | 2020-08-28 | 2021-01-05 | 国电南瑞南京控制系统有限公司 | AD sampling value compensation coefficient iteration method and system for resistance voltage division sampling technology |
| CN112187263B (en) * | 2020-08-28 | 2022-07-01 | 国电南瑞南京控制系统有限公司 | AD sampling value compensation coefficient iteration method and system for resistance voltage division sampling technology |
| CN112965019A (en) * | 2021-03-22 | 2021-06-15 | 云南省计量测试技术研究院 | Multidimensional intelligent compensation method for high-power current divider |
| CN114236454A (en) * | 2021-12-03 | 2022-03-25 | 北京东方计量测试研究所 | Error calibration method and device of broadband resistor divider |
| CN114236454B (en) * | 2021-12-03 | 2024-05-28 | 北京东方计量测试研究所 | Error calibration method and device for broadband resistor divider |
| CN114624517A (en) * | 2022-03-09 | 2022-06-14 | 国家海洋技术中心 | General resistance, voltage and frequency signal acquisition module |
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