CN110456300A - A kind of acquisition unit detection device and method based on adaptive comparison analytical technology - Google Patents
A kind of acquisition unit detection device and method based on adaptive comparison analytical technology Download PDFInfo
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Abstract
The invention discloses a kind of based on the adaptive acquisition unit detection device and method for comparing analytical technology, including FPGA module, ARM module, Optical fibre sampling receiving module, the synchronous sending module of optical fiber, DA output module, AD sampling module and Ethernet transceiver module, the synchronous sending module of Optical fibre sampling receiving module, optical fiber, DA output module and AD sampling module are connected to FPGA module, FPGA module is connected to ARM module, and ARM module is connected with human-computer interaction module and is connected with debugging interface RJ45 by Ethernet transceiver module.Acquisition unit closed loop of the present invention test, detection device can directly to acquisition unit outputting standard differential analog, while receive acquisition unit output digitized samples signal, it can be achieved that acquisition unit accurate closed loop contrastive test, testing result is more reliable.
Description
Technical field
The invention belongs to electric power digital substation fields, more particularly to one kind to compare analytical technology based on adaptive
Acquisition unit detection device and method.
Background technique
Electronic mutual inductor is small in size, it is light-weight, without magnetic saturation, without second open circuit, it is convenient to a high-voltage switch gear
Equipment combination installation, effectively increases device integration, land used, installation and transportation is reduced conveniently, before having a vast market application
Scape.Electronic mutual inductor is made of sensor coil and acquisition unit, and the electric current of primary system, voltage signal are through mutual inductor bulk line
After enclosing the progress of disease, secondary small analog signals are converted to, is acquired by in-site collecting unit and is converted to digital quantity sampled signal, pass through
Optical fiber output is to rear end.Acquisition unit is the core electric component of electronic mutual inductor, and the superiority and inferiority of Transfer characteristic directly determines
The sampling precision of electronic mutual inductor.
The special detection device of acquisition unit is less at present, mainly uses electronic mutual inductor open-loop test technology.Such as Fig. 1
It is shown, a high current/big voltage analog signal is exported by normalized current/voltage source, accesses the sensing of electronic mutual inductor
Coil is converted to secondary small voltage signal, then inputs the acquisition unit of electronic mutual inductor, is reconverted into digitized sampling value
It exports to external electronic mutual inductor tester.Sampling of the tester based on standard signal contrastive test electronic mutual inductor is defeated
Characteristic out obtains entirety (sensor coil and acquisition unit) precision index of electronic mutual inductor.
Existing detection technique equal Shortcomings in terms of test accuracy and test method.Firstly, using open-loop test skill
Art is compared manually with the received test product signal of tester with external perimysium reference signal, to external perimysium reference source output precision and
Stability requirement is higher, and test result error is also larger；Secondly, product to be tested contains electronic mutual inductor sensor coil and adopts
Collect unit, test result has shown the combination misalignment of the two, can not accurately characterize the characteristic of acquisition unit itself；Particularly,
The digitized sampling agreement of electronic mutual inductor output is not yet unified, the electronic mutual inductor acquisition unit output of each producer's production
How efficiently and adaptively sampled value is all had any different under Transmission bit rate, sample rate, coding mode and application layer frame format,
Receive the sampled value of acquisition unit output and the realization difficult point of acquisition unit detection technique.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of based on the adaptive acquisition unit detection for comparing analytical technology
Device and method solve the deficiency of current electronic mutual inductor acquisition unit detection device, for existing open loop detection technique pair
Standard source is more demanding, test result error is larger, can not independent test acquisition unit characteristic, do not have adaptively sampled access
The problems such as.
The technical scheme adopted by the invention is as follows: a kind of acquisition unit detection device based on adaptive comparison analytical technology,
Including FPGA module, ARM module, Optical fibre sampling receiving module, optical fiber synchronous sending module, DA output module, AD sampling module
With Ethernet transceiver module, the synchronous sending module of Optical fibre sampling receiving module, optical fiber, DA output module are connected with AD sampling module
To FPGA module, FPGA module is connected to ARM module, and ARM module is connected with human-computer interaction module and receives and dispatches mould by Ethernet
Block is connected with debugging interface RJ45, and FPGA module drives for bottom modular concurrent, real-time reception or transmission test data；ARM
Module is used for Data Management Analysis and human-computer interaction；Optical fibre sampling receiving module is used to receive the number of tested acquisition unit output
Change sampled value；The synchronous sending module of optical fiber is used to send synchronization signal to acquisition unit；DA output module is for sending standard source
Small voltage analog quantity；AD sampling module is used for real-time back production standard source analog quantity.
A kind of detection method based on the adaptive acquisition unit detection device for comparing analytical technology, this method are as follows: firstly,
The discrete instantaneous sampling value that standard source is calculated according to configuration exports small voltage analog quantity to tested acquisition after numerical differentiation calculates
Unit, while also exporting the primary standard source analog quantity without differential calculation all the way；Secondly, by AD sampling module access without
The standard source analog quantity of differential, the standard comparison signal as detection device；Then quilt is adaptively obtained through optic fiber transceiver module
The digitized samples signal for surveying acquisition unit output, the test product as detection device compare signal；It is finally automatic by detection device
Closed-Loop Analysis test data obtains the stable state accuracy of tested acquisition unit, the sampling progress of disease index of transient characterisitics and time response,
Realize the closed loop test function of acquisition unit.
A kind of detection method based on the adaptive acquisition unit detection device for comparing analytical technology, this method specifically include
Following steps:
Step 1, two-way standard output: ARM module obtains the analog quantity parameter of user configuration, and the analog quantity for calculating sample rate is instantaneous
Then sampled value exports analog quantity voltage signal through FPGA module driving D/A module；
Acquisition unit acquires the voltage signal Jing Guo differential process, then also by internal hardware integrating circuit or Software Integration algorithm
Originally it was crude sampling and exported, detection device needs two groups of synchronism output homologous master die analog quantity signals, all the way without number
Differential process, the standard source compared as detection device；Another way is handled by numerical differentiation, the output of simulation electronic formula mutual inductor
Signal accesses tested acquisition unit；
After detection device outputting standard signal, 2 and step 3 back production signal are entered step, realize automated closed-loop detection architecture；
Step 2, standard signal back production: after step 1 standard output, by step 2 back production wherein all the way without differential process
Standard source signal；
FPGA module drives AD sampling module, is digital quantity sampled value by the voltage analog analog-to-digital conversion of input, receives to inspection
Device is surveyed, every digital sample values are all accurately recorded corresponding sampling instant by FPGA, improve the essence of step 4 test data analysis
True property.
Step 3, digitized sampling adaptive reception: after step 1 standard output, acquisition unit is received by the way that step 3 is synchronous
The digital quantity test product signal of output；
FPGA module drives Optical fibre sampling module, receives the optical fiber and digital sampling of acquisition unit output, and every digital sample values are same
Sample accurately records the time of reception by FPGA, due to current electronic mutual inductor acquisition unit output sampled value protocol type compared with
It is more, need by compatibility mode it is adaptive receive and parse through sample information；
Principle of the FPGA module according to graceful code coding and non-graceful code coding, the maximum displacement week of continuous detection input digital signal
Phase distinguishes Signal coding mode, while determining protocol code baud rate using minimum displacement periodic quantity, and persistently press the baud rate
Sampling transmission of monitoring is carried out, after sampling link detecting is stablized, the link transmission by specific data starting character, by fixed word
Section receives data block, and carries out CRC check at the end of each data block, when received data block reaches maximum and CRC check
After terminate this reception；
Step 4, closed loop compare analysis: obtaining testing standard signal by step 2, while obtaining acquisition unit examination by step 3
Then product signal carries out error calculation to two groups of signals in step 4, detects the Transfer characteristic of acquisition unit；
ARM module summarizes the primary standard sampled value and acquisition unit output test product sampled value of FPGA module acquisition, realizes closed loop
Detection architecture, fourier calculating synchronous using interpolation, frequency analysis and waveform comparison method, automatically analyzes tested acquisition unit
The index of stable state progress of disease precision, transient state Transfer characteristic and time response realizes the independence self-adapting closed loop detection of acquisition unit.
Beneficial effects of the present invention: compared with prior art, effect of the invention is as follows:
(1) acquisition unit closed loop is tested, and detection device can be directly to acquisition unit outputting standard differential analog, simultaneously
Receive acquisition unit output digitized samples signal, it can be achieved that acquisition unit accurate closed loop contrastive test, testing result is more
Reliably；
(2) it is internally integrated small analog quantity standard source, it is defeated that detection device is internally integrated the small voltage analog quantity that precision is high, performance is stable
Standard source out can be directly accessed tested acquisition unit, support without electronic mutual inductor ontology coil and external perimysium reference source device,
The detection system configuration for greatlying simplify acquisition unit, improves testing efficiency；
(3) two-way standard signal synchronism output supports module of differentials analog quantity and original analog amount two-way standard source signal synchronism output,
Untreated signal is as comparison standard by device back production all the way, and digital differential signal simulation electronic formula mutual inductor coil is micro- all the way
Output is divided to be directly accessed tested acquisition unit, the homologous synchronization of two paths of signals, the detection for adapting to acquisition unit integral restoring function needs
It asks；
(4) acquisition unit sampling output adaptive acquisition exports digitized sampling based on the acquisition unit that FPGA module is realized
The electronic mutual inductor of adaptive reception, compatible current mainstream samples transport protocol, greatly improves the applicable model of detection device
It encloses；
(5) acquisition unit temporarily, Analysis of Steady-State Performance.Device can detect the accuracy of acquisition unit, frequency characteristic, instantaneous error,
The performance indicators such as combination misalignment, damping time constant, time response, protocol conformance.The temporary, stable state with perfect acquisition unit
Specificity analysis function.
Detailed description of the invention
Fig. 1 is electronic mutual inductor open-loop test system；
Fig. 2 is acquisition unit self-adapting detecting step；
Fig. 3 is acquisition unit detection device principle connection schematic diagram.
Specific embodiment
With reference to the accompanying drawing and the present invention is described further in specific embodiment.
Embodiment 1: a kind of based on the adaptive acquisition unit detection device for comparing analytical technology, packet as shown in Fig. 2-Fig. 3
Include the synchronous sending module of FPGA module, ARM module, Optical fibre sampling receiving module, optical fiber, DA output module, AD sampling module and
Ethernet transceiver module, the synchronous sending module of Optical fibre sampling receiving module, optical fiber, DA output module and AD sampling module are connected to
FPGA module, FPGA module are connected to ARM module, and ARM module is connected with human-computer interaction module and by Ethernet transceiver module
It is connected with debugging interface RJ45, FPGA module drives for bottom modular concurrent, real-time reception or transmission test data；ARM mould
Block is used for Data Management Analysis and human-computer interaction；Optical fibre sampling receiving module is used to receive the digitlization of tested acquisition unit output
Sampled value；The synchronous sending module of optical fiber is used to send synchronization signal to acquisition unit；DA output module is small for sending standard source
Voltage analog；AD sampling module is used for real-time back production standard source analog quantity.
1, FPGA module: the processor of FPGA module uses the Spartan-6 series of products XC6SLX150 of Xilinx, base
In 45nm low-power consumption technique, when including 147443 logic units, the Block RAM private memory of 4824Kb and 6 CMT
Clock management module, resourceful, the speed of service is fast, realizes the perfectly balanced of cost performance and power consumption.
Using the Parallel signal processing ability and real-time of FPGA, it is defeated to control the tested acquisition unit of optic fiber transceiver module acquisition
Digitized sampling out；Controlling optical fiber sending module output sync pulse signal, (detection relies on synchronization signal work to acquisition unit
Acquisition unit when)；Control D/A module outputting standard source analog signals；Control A/D module back production standard source analog signals；
Simultaneously with ARM interactive testing data.
2, ARM module: ARM module uses 6 series processors of i.MX of NXP, is based on Cortex-A9 core architecture, includes
One four core platform, running frequency reach as high as 1.2 GHz, are equipped with 1MB L2 caching, graphics hardware acceleration and 64 DDR3 or 2
Channel, 32 LPDDR2 are supported.The platform is integrated with FlexCAN and MLB bus, PCI Express and SATA-2, provides Zhuo
Connectivity more, while it being also integrated with binary channels MIPI display screen interface, MIPI utilizing camera interface and HDMI v1.4, it is very suitable
It shares in automatic industrial application.
ARM module and FPGA interactive testing data, control testing process and analysis detecting data；Simultaneously by Ethernet,
Liquid crystal and keyboard and external realization human-computer interaction, obtain configuration parameter, output test result.
3, Optical fibre sampling receiving module: Optical fibre sampling receiving module uses the serial optical fiber of AFBR 2418TZ of Avago company
Receiver has high-speed optical signal and receives ability.AFBR 2418TZ fiber optic receiver part use ST interface, operating temperature -40 to
85 degree, data wavelength 865nm is received, data rate maximum 50MBd is received, has good data compatibility.
Optical fibre sampling receiving module is responsible for receiving the digitized sampling value of tested acquisition unit output, and fiber-optic signal is converted
To input FPGA after level signal, subsequent sampled value protocol-decoding and verification are completed by FPGA.
4, the synchronous sending module of optical fiber: the synchronous sending module of optical fiber is sent out using the serial optical fiber of HFBR 1414 of Avago company
Device is sent, has high-speed optical signal transmitting capacity, the serial data that can meet under most baud rates sends demand.1414 light of HFBR
Fine sending device uses the ST interface of Tube packaged type, and operating temperature -40 is to 85 degree, the maximum rise time: 6.5 ns, most
Big fall time: 6.5 ns, pulse width distortion: 7.56 ns.
The exportable B code of the synchronous sending module of optical fiber or pulse per second (PPS) synchronization signal, when tested acquisition unit needs external sync
When signal triggers sampling operation, external synchronization source use can be used as.
5, DA output module: this module exports DAC AD5764 using four-way, 16, serial input, bipolar voltage,
It can provide high-precision, bipolarity data conversion.It is realized in entire operating temperature range using accurate reference voltage ADR02
Best DAC performance.External devices needed for this 16 precision DAC only have in reference voltage source, power pins and benchmark input
Resistance is arranged in decoupling capacitor and optional short circuit current, thus escapable cost and circuit board space.This circuit is very suitable to
Close loop servo control and opened loop control application.
AD5764 is a high-performance digital analog converter, it is ensured that monotonicity, integral nonlinearity (INL) error are ± 1
LSB(C grades of devices), noise is low, and settling time is 10 μ s.In wider operating voltage range, guarantee that there is rated performance.
AVDD supply voltage range is+11.4V to+16.5V, and AVSS operating voltage range is 11.4 V to 16.5 V, nominal full amount
Journey output voltage range is ± 10V.
To make the DAC reach optimum performance in entire operating temperature range, it is necessary to use accurate reference voltage.
Reference voltage source buffer built in AD5764, because without external positive and negative reference voltage source and relevant buffer, so just into
One step saves cost and circuit board space.The voltage applied on (REFAB, REFCD) is inputted because on the basis of to be used to generate in DAC
The positive and negative reference voltage of internal damping used in core, so any error of external reference voltages can be anti-by the output of the device
It mirrors and.
6, AD sampling module: using 18 gradual approaching A/D converter AD7982, sample rate maximum 1000kSPS,
High-precision, the analog-digital conversion function of high sampling rate can be achieved.AD7982 is powered using 2.5V single supply, a built-in low-power consumption,
At a high speed, 18 no missing code sampling ADCs, an internal conversion clock and a multi-functional serial interface port.
Sampling starts every time, and in conversion signal rising edge, AD7982 adopts the voltage difference between Differential Input pin
Sample.Reference voltage is provided by outside, and can be set to supply voltage.The power consumption and throughput rate of AD7982 changes linearly
Relationship.It supports SPI communication mode and daisy chain to link mode, and an optional busy instruction is provided.
7, Ethernet transceiver module: ethernet module is made of PHY chip, network transformer and RJ45 Ethernet interface,
PHY chip uses the LXT971 network communication interface circuit of Intel Company, it meets ieee standard, directly support 10Mb/s/
100Mb/s twisted pair applications also support 100Mb/s optical fiber interface.Compatible IEEE802.3, support 10Base5,10Base2,
10BaseT, 100BASE-X, 100BASE-TX, 100BASE-FX, and connected medium can be detected automatically.
FPGA configures PHY chip by MII interface module, is initially in IDLE state and monitors the state of bus, works as inspection
Automatically into SFD state when measuring the lead code of ethernet frame, if receiving the frame delimiter of ethernet data frame, into
Enter data receiving state, starts to receive PHY chip data by MII interface.After total data end of transmission bus free, connect
It receives module and reenters IDLE state, lower frame data is waited to receive.
Embodiment 2: a kind of detection method based on the adaptive acquisition unit detection device for comparing analytical technology, this method
Are as follows: firstly, calculating the discrete instantaneous sampling value of standard source according to configuration, small voltage analog quantity is exported extremely after numerical differentiation calculates
Tested acquisition unit, while also exporting the primary standard source analog quantity without differential calculation all the way；Secondly, passing through AD sampling module
Access the standard source analog quantity without differential, the standard comparison signal as detection device；Then adaptive through optic fiber transceiver module
The digitized samples signal of tested acquisition unit output should be obtained, the test product as detection device compares signal；Finally by detecting
Device automated closed-loop analyzes test data, obtains the sampling of the stable state accuracy, transient characterisitics and time response of tested acquisition unit
Progress of disease index realizes the closed loop test function of acquisition unit.
A kind of detection method based on the adaptive acquisition unit detection device for comparing analytical technology, this method specifically include
Following steps:
Step 1, two-way standard output: ARM module obtains the analog quantity parameter of user configuration, and the analog quantity for calculating sample rate is instantaneous
Then sampled value exports analog quantity voltage signal through FPGA module driving D/A module；
Acquisition unit acquires the small voltage signal Jing Guo differential process, then by internal hardware integrating circuit or Software Integration algorithm
It is reduced to crude sampling and exports, detection device needs two groups of synchronism output homologous master die analog quantity signals, all the way without number
Word differential process, the standard source compared as detection device；Another way is handled by numerical differentiation, and simulation electronic formula mutual inductor is defeated
Signal accesses tested acquisition unit out；
After detection device outputting standard signal, 2 and step 3 back production signal are entered step, realize automated closed-loop detection architecture；
Step 2, standard signal back production: after step 1 standard output, by step 2 back production wherein all the way without differential process
Standard source signal；
FPGA module drives AD sampling module, is digital quantity sampled value by the voltage analog analog-to-digital conversion of input, receives to inspection
Device is surveyed, every digital sample values are all accurately recorded corresponding sampling instant by FPGA, improve the essence of step 4 test data analysis
True property.
Step 3, digitized sampling adaptive reception: after step 1 standard output, acquisition unit is received by the way that step 3 is synchronous
The digital quantity test product signal of output；
FPGA module drives Optical fibre sampling module, receives the optical fiber and digital sampling of acquisition unit output, and every digital sample values are same
Sample accurately records the time of reception by FPGA, due to current electronic mutual inductor acquisition unit output sampled value protocol type compared with
It is more, need by compatibility mode it is adaptive receive and parse through sample information；
Principle of the FPGA module according to graceful code coding and non-graceful code coding, the maximum displacement week of continuous detection input digital signal
Phase distinguishes Signal coding mode, while determining protocol code baud rate using minimum displacement periodic quantity, and persistently press the baud rate
Sampling transmission of monitoring is carried out, after sampling link detecting is stablized, the link transmission by specific data starting character, by fixed word
Section receives data block, and carries out CRC check at the end of each data block, when received data block reaches maximum and CRC check
After terminate this reception；
Step 4, closed loop compare analysis: obtaining testing standard signal by step 2, while obtaining acquisition unit examination by step 3
Then product signal carries out error calculation to two groups of signals in step 4, detects the Transfer characteristic of acquisition unit；
ARM module summarizes the primary standard sampled value and acquisition unit output test product sampled value of FPGA module acquisition, realizes closed loop
Detection architecture, fourier calculating synchronous using interpolation, frequency analysis and waveform comparison method, automatically analyzes tested acquisition unit
The index of stable state progress of disease precision, transient state Transfer characteristic and time response realizes the independence self-adapting closed loop detection of acquisition unit.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims lid.
Claims (3)
1. a kind of based on the adaptive acquisition unit detection device for comparing analytical technology, it is characterised in that: including FPGA module,
The synchronous sending module of ARM module, Optical fibre sampling receiving module, optical fiber, DA output module, AD sampling module and Ethernet receive and dispatch mould
Block, the synchronous sending module of Optical fibre sampling receiving module, optical fiber, DA output module and AD sampling module are connected to FPGA module,
FPGA module is connected to ARM module, and ARM module is connected with human-computer interaction module and is connected with debugging by Ethernet transceiver module
Interface RJ45, FPGA module drive for bottom modular concurrent, real-time reception or transmission test data；ARM module is used for data
Processing analysis and human-computer interaction；Optical fibre sampling receiving module is used to receive the digitized sampling value of tested acquisition unit output；Light
The synchronous sending module of fibre is used to send synchronization signal to acquisition unit；DA output module is for sending the simulation of standard source small voltage
Amount；AD sampling module is used for real-time back production standard source analog quantity.
2. a kind of detection side based on the adaptive acquisition unit detection device for comparing analytical technology according to claim 1
Method, it is characterised in that: this method are as follows: firstly, calculating the discrete instantaneous sampling value of standard source according to configuration, calculated through numerical differentiation
Output small voltage analog quantity is to tested acquisition unit afterwards, while also exporting the primary standard source simulation without differential calculation all the way
Amount；Secondly, accessing the standard source analog quantity without differential, the standard comparison signal as detection device by AD sampling module；
Then the digitized samples signal of tested acquisition unit output, the examination as detection device are adaptively obtained through optic fiber transceiver module
Product compare signal；Test data is finally analyzed by detection device automated closed-loop, obtains stable state accuracy, the transient state of tested acquisition unit
The sampling progress of disease index of characteristic and time response.
3. a kind of detection side based on the adaptive acquisition unit detection device for comparing analytical technology according to claim 2
Method, it is characterised in that: this method specifically includes the following steps:
Step 1, two-way standard output: ARM module obtains the analog quantity parameter of user configuration, and the analog quantity for calculating sample rate is instantaneous
Then sampled value exports analog quantity voltage signal through FPGA module driving D/A module；
Acquisition unit acquires the voltage signal Jing Guo differential process, then also by internal hardware integrating circuit or Software Integration algorithm
Originally it was crude sampling and exported, detection device needs two groups of synchronism output homologous master die analog quantity signals, all the way without number
Differential process, the standard source compared as detection device；Another way is handled by numerical differentiation, the output of simulation electronic formula mutual inductor
Signal accesses tested acquisition unit；
After detection device outputting standard signal, 2 and step 3 back production signal are entered step；
Step 2, standard signal back production: after step 1 standard output, by step 2 back production wherein all the way without differential process
Standard source signal；
FPGA module drives AD sampling module, is digital quantity sampled value by the voltage analog analog-to-digital conversion of input, receives to inspection
Device is surveyed, every digital sample values all record corresponding sampling instant by FPGA；
Step 3, digitized sampling adaptive reception: after step 1 standard output, acquisition unit output is received by the way that step 3 is synchronous
Digital quantity test product signal；
FPGA module drives Optical fibre sampling module, receives the optical fiber and digital sampling of acquisition unit output, and every digital sample values are same
Sample records the time of reception by FPGA, by compatibility mode it is adaptive receive and parse through sample information；
Principle of the FPGA module according to graceful code coding and non-graceful code coding, the maximum displacement week of continuous detection input digital signal
Phase distinguishes Signal coding mode, while determining protocol code baud rate using minimum displacement periodic quantity, and persistently press the baud rate
Sampling transmission of monitoring is carried out, after sampling link detecting is stablized, the link transmission by specific data starting character, by fixed word
Section receives data block, and carries out CRC check at the end of each data block, when received data block reaches maximum and CRC check
After terminate this reception；
Step 4, closed loop compare analysis: obtaining testing standard signal by step 2, while obtaining acquisition unit examination by step 3
Then product signal carries out error calculation to two groups of signals in step 4, detects the Transfer characteristic of acquisition unit；
ARM module summarizes the primary standard sampled value and acquisition unit output test product sampled value of FPGA module acquisition, realizes closed loop
Detection architecture, fourier calculating synchronous using interpolation, frequency analysis and waveform comparison method, automatically analyzes tested acquisition unit
The index of stable state progress of disease precision, transient state Transfer characteristic and time response realizes the independence self-adapting closed loop detection of acquisition unit.
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Cited By (2)
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| CN113759194A (en) * | 2021-08-16 | 2021-12-07 | 国微集团(深圳)有限公司 | Human body signal collecting and generating device |
| CN114062888A (en) * | 2020-08-03 | 2022-02-18 | 南京南瑞继保电气有限公司 | Automatic detection system and detection method for sampling plate of bus protection device |
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