CN102435847B - High-precision electrical parameter analyzer - Google Patents
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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 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 preferably Multi-functional standard table products in more domestic instrument producers, its function and performance can not satisfy IEC or national standard to the requirement of multifunctional analysis instrument, some otherly carry out the frequency analysis analysis than low side power quality analyzer device common FFT or the DFT algorithms of adopting more, the partial analysis instrument 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 Practical Project uses, and domestic enterprise is most or 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, although but also unusual height of the external better price of instrument Performance Ratio, therefore and after-sales service is very inconvenient and maintenance cost is very high, develops the high and multifunction electric parametric analysis instrument that can control cost of class of accuracy and is necessary very much.
Summary of the invention
Purpose of the present invention is intended to overcome the defective of prior art, provides that a kind of test analysis function is complete, measuring accuracy is high, shows complete, the easy to operate high precision electro parametric analysis instrument of data.
High precision electro parametric analysis instrument of the present invention, formed 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 digit signals enters display behind arithmetic control circuit and host computer shows.
Described simulating signal sampling thief is made 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 electric route programmable amplifier, multiplexer consist of, 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 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.
Described 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 consist of to difference AD driver, the input end of voltage follower connects the output terminal of voltage follower and single-ended to difference AD with the multiplexer of three-phase input automatic control circuit
Driver connects, and single-endedly connects with the A/D sample circuit to difference AD driver.
Described A/D sample circuit is made 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 difference input A/D converter.
Described arithmetic control circuit is made 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 programmable amplifier and the multiplexer of three-phase input automatic control circuit, the input end of DDS digital frequency synthesizer connects with the 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 by the RS232 serial line interface.
High precision electro parametric analysis instrument of the present invention, use DSP as main process chip, voltage signal is by high precision MN type resitstance voltage divider after the simulation measured signal input, electric current is sampled as six road A/D converter operating voltage signals by the high precision two-stage current transformer, signal is realized the control of automatic measuring limit through programmable amplifier, six road signals are converted into two paths of signals by the multiplexer polling, two paths of signals improves after the input impedance through single-ended through voltage follower and enters 18 potential differences to the difference AD driver and divide input A/D converter to be converted to digital signal, 18 potential differences divide the amplitude of input A/D converter with reference to being provided by reference voltage circuit, sample frequency is synthesized by the DDS digital frequency synthesizer and is provided through behind the sequential control circuit, digital signal after the conversion divides input A/D converter to be sent to the DSP processor by 18 potential differences, and carry out the amplitude that calculation process calculates to be needed by DSP, frequency, the information such as phase place, wherein non-integer-period Fourier backoff algorithm has been adopted in frequency analysis, cooperate the DDS digital frequency synthesizer to follow the tracks of the measured signal frequency and can significantly improve the frequency analysis precision, amplitude information DSP processor according to signal is controlled the control of realization automatic measuring limit to programmable amplifier, digital frequency synthesizer is controlled so that 18 potential differences divide input A/D converter sampling frequency to remain the integral multiple of measured signal frequency according to signal frequency information D SP, the result data of handling well is sent to touch liquid-crystal controller by the RS232 serial line interface with the DSP processor and host computer shows, while touch type liquid crystal display and host computer are sent to DSP by the RS232 serial line interface with user's input information and process, and according to these information D SP processor the each several part circuit are controlled and are realized various different measuring functions.Test analysis function of the present invention is many, the electricity parameter measuring accuracy is high, the frequency analysis precision is high, show that data are complete, easy to operate.
Description of drawings
Fig. 1 is 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 further described, but is not limited to embodiment.
Shown in Fig. 1, high precision electro parametric analysis instrument of the present invention, comprise the simulating signal sampling thief, three-phase input automatic control circuit, the front-end driven circuit, the A/D sample circuit, arithmetic control circuit, display and host computer, MN type resitstance voltage divider, two-stage current transformer consists of the simulating signal sampling thief, MN type resitstance voltage divider is high precision MN type resitstance voltage divider, two-stage current transformer is the high precision two-stage current transformer, the tested voltage of three-phase, current signal passes through respectively high precision MN type resitstance voltage divider, the high precision two-stage current transformer inputs in the three-phase input automatic control circuit, programmable amplifier, multiplexer consists of three-phase input automatic control circuit, the input end of programmable amplifier connects with high precision MN type resitstance voltage divider and high precision two-stage current transformer in the simulating signal sampling thief, two identical resistance in seriess of above resistance consist of high precision MN type resitstance voltage divider with two identical parallel resistances of above resistance, shown in Fig. 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, the output terminal of programmable amplifier connects with multiplexer, multiplexer connects with the front-end driven circuit, voltage follower, single-ended to difference AD driver formation front-end driven circuit, 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 connect 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 consists of the A/D sample circuit, difference input A/D converter connects with the front-end driven circuit, difference input A/D converter, sequential control circuit connects with arithmetic control circuit, by the DSP processor, the DDS digital frequency synthesizer consists of arithmetic control circuit, the input end of DSP processor connects with the A/D sample circuit, the output terminal of DSP processor connects with programmable amplifier and the multiplexer of three-phase input automatic control circuit, the input end of DDS digital frequency synthesizer connects with the 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 connects A/D sample circuit output digit signals with difference input A/D converter and enter display and host computer demonstration behind arithmetic control circuit, host computer is computing machine, PDA, mobile phone, a kind of in the panel computer, host computer connects with DSP processor in the arithmetic control circuit by the RS232 serial line interface.
High precision electro parametric analysis instrument of the present invention, tested simulating signal is through the high-precision analog signal sampler, three-phase input automatic control circuit, be converted to digital signal by the A/D sample circuit behind the front-end driven circuit, digital signal inputs to arithmetic control circuit and carries out computing, analyze, DSP processor device exports the operational analysis result to display by the RS232 serial line interface and host computer shows, simultaneously according to operation result and display, the host computer input is controlled three-phase input automatic control circuit and is realized the control of automatic measuring limit and three phase input signal pollings.
High precision electro parametric analysis instrument of the present invention, high-precision analog signal sampler comprise high precision MN type resitstance voltage divider, high precision two-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, output point B, a common point C, input point A is noble potential, output point B is 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, earth shield structure, this structure MN type resitstance voltage divider can be increased to 0.0003% with the dividing potential drop precision.The high precision two-stage current transformer adopts twin-stage compensation winding that the angular difference of measured signal is compensated, and improves accuracy and the phase differential of sampling, so that the current sample precision is increased to 0.005%.
High precision electro parametric analysis instrument of the present invention, three-phase input automatic control circuit comprises programmable amplifier, multiplexer.Programmable amplifier is made of 6 pga207 programmable amplifiers, this amplifier gain can be set to 1,2,5,10 times by 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, MAX309 is high precision, 8 passages/pair 4 passages, high-performance, CMOS analog multiplexer, polling speed is fast, and distorted signals is little.
High precision electro parametric analysis instrument 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 for improving 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 for driving the difference input a/d converter, AD8138 can greatly simplify differential signal to differential amplifier or difference to differential amplifier and amplifies and drive as single-ended, adopt the proprietary XFCB bipolar technology of ADI company to make,-3 dB bandwidth are 320 MHz, differential signal is provided, and harmonic distortion is minimum in existing differential amplifier.
High precision electro parametric analysis instrument 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 without the gradual approaching A/D converter of 18 accuracy resolutions of error code without transmission delay, power as single group 5V power supply, support serial and parallel system interface.AD7679 difference input range is 5V to the maximum, and speed soon high sampling rate is 500kSPS, and power consumption very low when sampling rate is 570kSPS power consumption only be 76mW.The linearity of AD7679 and dynamic range in ADC of the same type than more excellent, so and owing to approach one by one structure 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 the A/D converter is introduced greatly.Reference voltage circuit utilizes AD780 to realize, 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 arbitrary size, therefore is suitable for very much strengthening the performance of high resolution A/D 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 electro parametric analysis instrument of the present invention, arithmetic and control unit comprises DSP processor, DDS digital frequency synthesizer.The DSP processor is selected floating type digital signal processor TMS320C6713, has two-way McBSP interface, be respectively applied to pass through the digital signal that 18 AD transmit behind receiver voltage, the current sample, the EMIF of TMS320C6713 has very strong interface capability, 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, and EMIF is used for the expanding peripherals realization to the control of other parts.The DDS digital frequency synthesizer adopts Direct Digital Frequency Synthesizers DDS special chip AD9850, AD9850 direct digital synthesiser 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, using direct digital synthesiser to substitute traditional analog phase-locked look follows the tracks of the measured signal frequency, guarantee that sample frequency is by the integral multiple of measured frequency, can improve analysis by Effective Raise, the accuracy of measuring, the particularly accuracy of frequency analysis, the RS232 serial line interface utilizes the EMIF mouth of DSP processor to utilize the expansion of TL16C752B UART Universal Asynchronous Receiver Transmitter UART chip, be used for same liquid crystal display, 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 carrying the Modem interface signal, maximum transmission rate can reach the 1.5Mbps baud rate.
High precision electro parametric analysis instrument of the present invention, display adopts touch type liquid crystal display, carry out exchanges data by RS232 serial line interface and DSP processor, also possesses input function except possessing Presentation Function, replace the keyboard input of conventional instrument, 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 by RS232 serial line interface and DSP processor, is used for storage, management testing, analysis data and utilizes auto-control software to realize automatic control to analyser.
High precision electro parametric analysis instrument of the present invention, algorithm of harmonics analysis is non-integer-period Fourier backoff algorithm, this algorithm is by 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 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 harmonic amplitude and angle values close to actual value, utilizing DDS frequency synthesizer realization frequency-tracking and other control devices to guarantee that complement is in 0.5, the accuracy of single harmonic component analysis can be brought up to 0.05%, well beyond common harmonic analysis instrument.
High precision electro parametric analysis instrument 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, flush type meter operating system with autonomous establishment, touch input, simple interface inclusion information amount is large, can realize that real-time graph shows, provides stable display interface for triphase parameter information shows, multiple harmonic shows, polar plot shows, oscillogram shows.Have the program control Management software platform of host computer, realize that 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, IF harmonic analysis is except using DDS to realize the hardware frequency tracking, also used non-integer-period Fourier backoff algorithm, the single harmonic component measuring accuracy increases substantially analysis precision, so that can reach 0.05%.
High precision electro parametric analysis instrument of the present invention, use DSP as main process chip, voltage signal is by high precision MN type resitstance voltage divider after the simulation measured signal input, electric current is sampled as six road A/D converter operating voltage signals by the high precision two-stage current transformer, signal is realized the control of automatic measuring limit through programmable amplifier, six road signals are converted into two paths of signals by the multiplexer polling, two paths of signals improves after the input impedance through single-ended through voltage follower and enters 18 potential differences to the difference AD driver and divide input A/D converter to be converted to digital signal, 18 potential differences divide the amplitude of input A/D converter with reference to being provided by reference voltage circuit, sample frequency is synthesized by the DDS digital frequency synthesizer and is provided through behind the sequential control circuit, digital signal after the conversion divides input A/D converter to be sent to the DSP processor by 18 potential differences, and carry out the amplitude that calculation process calculates to be needed by DSP, frequency, the information such as phase place, wherein non-integer-period Fourier backoff algorithm has been adopted in frequency analysis, cooperate the DDS digital frequency synthesizer to follow the tracks of the measured signal frequency and can significantly improve the frequency analysis precision, amplitude information DSP processor according to signal is controlled the control of realization automatic measuring limit to programmable amplifier, digital frequency synthesizer is controlled so that 18 potential differences divide input A/D converter sampling frequency to remain the integral multiple of measured signal frequency according to signal frequency information D SP, the result data of handling well is sent to touch liquid-crystal controller by the RS232 serial line interface with the DSP processor and host computer shows, while touch type liquid crystal display and host computer are sent to DSP by the RS232 serial line interface with user's input information and process, and according to these information D SP processor the each several part circuit are controlled and are realized various different measuring functions.Test analysis function of the present invention is many, the electricity parameter measuring accuracy is high, the frequency analysis precision is high, show that data are complete, easy to operate.
Embodiment 2
High precision electro parametric analysis instrument of the present invention, high precision MN type resitstance voltage divider comprise that 11 resistance values are identical
Resistance in series and 12 parallel resistances that resistance value is identical.All the other are with embodiment 1.
Embodiment 3
High precision electro parametric analysis instrument of the present invention, high precision MN type resitstance voltage divider comprise that 13 resistance values are identical
Resistance in series and 10 parallel resistances that resistance value is identical.All the other are with embodiment 1.
Embodiment 4
High precision electro parametric analysis instrument of the present invention, high precision MN type resitstance voltage divider comprise that 22 resistance values are identical
Resistance in series and 6 parallel resistances that resistance value is identical.All the other are with embodiment 1.
Claims (6)
1. high precision electro parametric analysis instrument, by the simulating signal sampling thief, three-phase input automatic control circuit, the front-end driven circuit, the A/D sample circuit, arithmetic control circuit, display and host computer form, the tested voltage of three-phase, current signal inputs 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, A/D sample circuit output digit signals enters display behind arithmetic control circuit and host computer shows, it is characterized in that, described simulating signal sampling thief is by MN type resitstance voltage divider, two-stage current transformer consists of, MN type resitstance voltage divider, two-stage current transformer connects with three-phase input automatic control circuit respectively, MN type resitstance voltage divider is made of resistance in series and parallel resistance, 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, all at least two of resistance in series and parallel resistances, and the resistance value of each resistance is identical.
2. high precision electro parametric analysis instrument according to claim 1, it is characterized in that, described three-phase input automatic control electric route programmable amplifier, multiplexer consist of, 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.
3. high precision electro parametric analysis instrument according to claim 2, it is characterized in that, described front-end driven circuit by voltage follower, single-endedly consist of 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 A/D driver with single-ended, single-endedly connects with the A/D sample circuit to difference A/D driver.
4. high precision electro parametric analysis instrument according to claim 1, it is characterized in that, described A/D sample circuit is made of difference input a/d converter, voltage reference circuit, sequential control circuit, the difference input a/d converter connects with the front-end driven circuit, 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.
5. high precision electro parametric analysis instrument according to claim 4, it is characterized in that, described arithmetic control circuit is made 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 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.
6. high precision electro parametric analysis instrument according to claim 5 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 by the RS232 serial line interface.
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| CN111537795A (en) * | 2020-04-21 | 2020-08-14 | 吉林大学 | Distributed frequency domain complex signal measuring system and method |
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| CN103513211B (en) * | 2013-10-25 | 2016-03-02 | 国家电网公司 | Ac impedance measurement measuring device |
| 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 |
| CN106645590B (en) * | 2017-01-20 | 2023-06-13 | 中国工程物理研究院总体工程研究所 | Gas concentration measuring 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 |
| CN112187263B (en) * | 2020-08-28 | 2022-07-01 | 国电南瑞南京控制***有限公司 | AD sampling value compensation coefficient iteration method and system for resistance voltage division sampling technology |
| CN112965019B (en) * | 2021-03-22 | 2023-04-28 | 云南省计量测试技术研究院 | Multi-dimensional intelligent compensation method for high-power current 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 |
| CN114624517B (en) * | 2022-03-09 | 2023-05-09 | 国家海洋技术中心 | Universal resistor, voltage and frequency signal acquisition module |
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| JP3029390B2 (en) * | 1994-09-06 | 2000-04-04 | 三菱電機株式会社 | Waveform sampling method and apparatus, and AC measurement method and apparatus |
| CN201352234Y (en) * | 2009-05-18 | 2009-11-25 | 深圳市森晖电子有限公司 | Three-phase multifunctional electric energy meter |
| CN201535801U (en) * | 2009-10-14 | 2010-07-28 | 海安县商业学校 | Harmonic wave monitoring system of electrical network based on ARM9 |
| CN202421332U (en) * | 2011-10-30 | 2012-09-05 | 云南省计量测试技术研究院 | High precision electric parameter analyzer |
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| CN111537795A (en) * | 2020-04-21 | 2020-08-14 | 吉林大学 | Distributed frequency domain complex signal measuring system and method |
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