CN102809946B - Noise immunity multichannel parameter monitoring system - Google Patents
Noise immunity multichannel parameter monitoring system Download PDFInfo
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- CN102809946B CN102809946B CN201110142283.XA CN201110142283A CN102809946B CN 102809946 B CN102809946 B CN 102809946B CN 201110142283 A CN201110142283 A CN 201110142283A CN 102809946 B CN102809946 B CN 102809946B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a noise immunity multichannel parameter monitoring system which comprises a test host, a monitoring host, a data acquisition device and at least one data acquisition card. A data acquisition card acquires a monitoring parameter and sends an acquired parameter signal to the monitoring host; the monitoring host receives the parameter signal and a test signal sent by the test host, judges whether the monitoring parameter exceeds an early warning limitative range and sends a monitoring parameter abnormal alarm signal; the data acquisition device receives the monitoring parameter abnormal alarm signal and forwards the alarm signal to the test host; the test host sets an interference source frequency and sends a test signal to the monitoring test; and the test host receives the alarm signal and regulates the intensity of the test signal according to the alarm signal. The noise immunity multichannel parameter monitoring system disclosed by the invention adopts few monitoring instruments, occupies a small area, is saving in manpower resources, has good accuracy and high efficiency, can be used for carrying out real-time recording of monitored data and has good repeatability.
Description
Technical field
The present invention relates to a kind of electric signal supervisory system, relate in particular to a kind of immunity to interference test hyperchannel electrical quantity supervisory system.
Background technology
Growing along with auto parts and components electronic technology, increasing electronic component (as ignition coil, illuminating lamp, pilot lamp, antenna lifter, GPS GPS etc.) is applied among car load, and the electronic component of these automobiles is being realized extremely various function (as the control function of driving safety function, deixis, anti-theft feature, driving process, driver's comfort conditioned function and amusement function etc.) at automotive interior.Yet, so many electronic components are applied among automobile, between each parts, can produce undesired signal, cause electromagnetic compatibility (the Electro Magnetic Compatibility between electronic component, EMC) problem is more and more outstanding, and the antijamming capability of electronic component is also just had higher requirement.Therefore, the jamproof test of electronic component has become a requisite test routinely.For the more parts test of parameter, need the parameter (the particularly parameter of electric signal) of monitoring and record to reach tens.
Prior art adopts oscillograph, multimeter or other data acquiring and recording equipment to monitor and recording parameters conventionally, the equipment, manpower and the resource that need are more, cost data trackability high and monitoring can not guarantee, the error of adding inevitable human factor also can cause the accuracy of test to reduce, repeatable bad.
Chinese patent CN101702015A is immediate prior art.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve accuracy of detection and repeated immunity to interference multi-channel parameter supervisory system.
A kind of immunity to interference multi-channel parameter supervisory system, comprise Test Host, monitoring host computer, data acquisition unit and at least one data collecting card, described data collecting card gathers the monitoring parameter of the multi-channel test passage of measured device, and the parameter signal collecting is sent to described monitoring host computer; Described monitoring host computer receives the parameter signal of described data collecting card transmission and the test signal that described Test Host sends, and judge whether described monitoring parameter exceeds warning limited field, if described monitoring parameter exceeds warning limited field, described monitoring host computer sends monitoring parameter abnormal alarm signal; Described data acquisition unit receives described monitoring parameter abnormal alarm signal, and described monitoring parameter abnormal alarm signal is transmitted to described Test Host; Described Test Host arranges interference source frequency according to test request, and send described test signal to described monitoring host computer, the frequency of described test signal is described interference source frequency, described Test Host receives described monitoring parameter abnormal alarm signal, and according to described monitoring parameter abnormal alarm signal, adjust the intensity of described test signal, and the test signal after adjusting is sent to described monitoring host computer.
The preferred a kind of technical scheme of above-mentioned supervisory system, the measured signal voltage amplitude that described monitoring parameter is described measured device, measured signal Frequency and Amplitude.
The preferred a kind of technical scheme of above-mentioned supervisory system, described monitoring host computer records the frequency of described test signal, described measured signal voltage amplitude, measured signal Frequency and Amplitude.
The preferred a kind of technical scheme of above-mentioned supervisory system, described monitoring host computer is recorded in the frequency of described test signal, described measured signal voltage amplitude, measured signal Frequency and Amplitude in TXT document.
The preferred a kind of technical scheme of above-mentioned supervisory system, described monitoring host computer adopts the mode of default bound, and whether monitoring parameter exceeds described warning limited field described in automatic decision.
The preferred a kind of technical scheme of above-mentioned supervisory system, described monitoring host computer is the computing machine that comprises USB interface, RS232 interface, described monitoring host computer utilizes described USB interface to receive described monitoring parameter, and described monitoring host computer utilizes described RS232 interface to receive described test signal.
The preferred a kind of technical scheme of above-mentioned supervisory system, described Test Host comprises general purpose interface bus, described Test Host utilizes described general purpose interface bus to receive described monitoring parameter abnormal alarm signal.
The preferred a kind of technical scheme of above-mentioned supervisory system, described monitoring host computer sends to described data collecting card by described monitoring parameter abnormal alarm signal, and described data collecting card is transmitted to described data acquisition unit by described monitoring parameter abnormal alarm signal.
The preferred a kind of technical scheme of above-mentioned supervisory system, also comprises that parameter arranges runnable interface, for setting in advance the voltage of test channel way, the measured signal of every road and the warning limited field of frequency monitoring and for monitored picture.
The preferred a kind of technical scheme of above-mentioned supervisory system, also comprises voltage, frequency display interface based on measured signal, for recording amplitude, the measured signal Frequency and Amplitude of described measured signal.
Compared with prior art, immunity to interference multi-channel parameter supervisory system of the present invention has realized the information interaction of described Test Host and described monitoring host computer, expanded the performance of described Test Host, the perfect flow process of whole supervisory system, enriched the statement of test result, the greatly perfect quality control of test process, can give the reference data objective and accurate with engineering staff.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of immunity to interference multi-channel parameter supervisory system of the present invention.
Fig. 2 is the process flow diagram of the Test Host operation in immunity to interference multi-channel parameter supervisory system of the present invention.
Fig. 3 is the process flow diagram of the monitoring host computer operation in immunity to interference multi-channel parameter supervisory system of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Refer to Fig. 1, Fig. 1 is the block diagram of immunity to interference multi-channel parameter supervisory system of the present invention.Described immunity to interference multi-channel parameter supervisory system comprises Test Host 11, monitoring host computer 12, at least one data collecting card (Data Acquisition, DAQ) 13 and data acquisition unit 14.Described data collecting card 13 is for gathering the monitoring parameter of the multi-channel test passage of measured device (Device Under Test, DUT) 15, and a parameter signal collecting sends to described monitoring host computer 12.Described monitoring host computer 12 receives the parameter signal of described data collecting card 13 transmissions and the test signal that described Test Host 11 sends, and judge whether described monitoring parameter exceeds warning limited field, if described monitoring parameter exceeds warning limited field, described monitoring host computer 12 sends monitoring parameter abnormal alarm signal.Described data acquisition unit 14 receives described monitoring parameter abnormal alarm signal, and described monitoring parameter abnormal alarm signal is transmitted to described Test Host 11.Described Test Host 11 first arranges interference source frequency according to test request, and send described test signal to described monitoring host computer 12, the frequency of described test signal is described interference source frequency, described Test Host 11 receives described monitoring parameter abnormal alarm signal, and according to described monitoring parameter abnormal alarm signal, adjust the intensity of described test signal, then the test signal after adjusting is sent to described monitoring host computer 12.
Immunity to interference multi-channel parameter supervisory system of the present invention couples together Test Host 11 and monitoring host computer 12, realizes the collaborative work of Test Host 11 and 12 liang of cover systems of monitoring host computer, jointly completes the monitoring to described measured device 15.Described Test Host 11 is responsible for disturbing, and the test frequency signal that test process is used sends to described monitoring host computer 12, and applies satisfactory interference strength to the pilot signal of described measured device 15.The parameter that described monitoring host computer 12 is responsible for the described measured device 15 of monitoring changes, and records actual effect situation, in time monitoring parameter abnormality alarm signal is transferred to described Test Host 11, thereby triggers the intensity that described Test Host 11 is adjusted described test frequency signal.Immunity to interference multi-channel parameter supervisory system of the present invention has realized the information interaction of described Test Host 11 and described monitoring host computer 12, expanded the performance of described Test Host 11, the perfect flow process of whole supervisory system, enriched the statement of test result, the greatly perfect quality control of test process, can give the reference data objective and accurate with engineering staff.
Below each module of immunity to interference multi-channel parameter supervisory system of the present invention is described in detail:
Described data collecting card 13 is connected with described measured device 15 by signal wire, thereby utilizes this signal wire to gather the monitoring parameter of described measured device 15, and described monitoring parameter can be voltage amplitude and the Frequency and Amplitude value of measured signal.Described data collecting card 13 connects described monitoring host computer 12 by usb data line, thereby utilizes this usb data line receive the monitoring parameter abnormal alarm signal of described monitoring host computer 12 transmissions and send to described monitoring host computer 12 monitoring parameter receiving.Described data collecting card 13 can be multi-Channel Data Acquisition Card, as 32 circuit-switched data capture cards, thereby realizes the data acquisition to multichannel measured signal.Further, more when the signal way that needs are measured, when a data collecting card can not meet testing requirement, also can use by a plurality of data collecting cards simultaneously.
Preferably, described data collecting card 13 is USB-6259 high speed M series multifunctional data collecting cards that NI produces, referred to as DAQ6259.DAQ6259 is to be conditional application specific design on mobile application or space, and the installation of its plug and play has farthest reduced configuration and setup times, can directly be connected with screw terminal simultaneously, is conducive to cutting down cost and the connection of simplifying signal.DAQ6259 also has new NI signal data stream technology, has realized the bidirectional high speed data flow operations of similar DMA on usb bus, use, so DAQ6259 also can keep high precision under high sampling rate with LabVIEW, LabWindows/CVI are compatible.DAQ6259 is furnished with 32 tunnel analog inputs (16), single channel 1.25MS/s sampling rate (amounting to 1MS/s), 4 tunnel simulation outputs (16,2.8MS/s), 48 I/O lines (32 clock lines).In immunity to interference multi-channel parameter supervisory system of the present invention, DAQ6259 is connected with the LOADBOX of described measured device 15 by I/O line, utilizes analog input channel to gather the monitoring parameter of described measured device 15.DAQ6259 also connects described data acquisition unit 14 by PIN pin P1.0, GND, thereby forwards described monitoring parameter abnormal alarm signal to described data acquisition unit 14.
Immunity to interference multi-channel parameter supervisory system of the present invention can realize 32 tunnels or the signal testing of multichannel more, because the monitored way possibility a lot (tens tunnels) of measured device 15 or seldom (a few road), therefore, pass through programming, carry out the distribution of sampling rate can freely to all passages, according to actual monitoring, need configuration monitoring way will effectively utilize the testing efficiency of described data collecting card 13 like this, realize flexible configuration sampling rate and adopt the resources such as passage, bring great convenience to actual test.
The data acquisition unit that the model that described data acquisition unit 14 can be produced for Anjelen Sci. & Tech. Inc (Agilent) is 34970A.34970A data acquisition unit is data acquisition and the switch main frame of a kind of high-performance, low price, is extremely suitable for data recording, data acquisition and general switch and control application.In immunity to interference multi-channel parameter supervisory system of the present invention, when described monitoring host computer 12 judgements have monitoring parameter abnormal, to described data collecting card 13, send monitoring parameter abnormal alarm signal, described data collecting card 13 is by PIN pin P1.0, GND is transmitted to 34970A data acquisition unit by this alerting signal, 34970A data acquisition unit produces immediately switching signal and passes through general purpose interface bus General-Purpose Interface Bus, GPIB) this alerting signal is sent to described Test Host 11, thereby realize when monitoring parameter is abnormal, automatic regulating function to test frequency point.
Described Test Host 11 comprises general purpose interface bus 111, described Test Host 11 utilizes described general purpose interface bus 111 to receive described monitoring parameter abnormal alarm signal, and according to this alerting signal, automatically adjust the intensity of interference source frequency, finally draw the Immunity Performance of measured device 15.Concrete, described Test Host 11 can be for comprising the computing machine of communication module, gpib interface, RS232 interface.Described Test Host 11 is connected with described monitoring host computer 12 by RS232 data line, thereby utilizes this RS232 data line to send test frequency signal to described monitoring host computer 12.Described communication module is for sending test frequency signal to described monitoring host computer 12 and inquiring about described monitoring host computer 12 about the inefficacy feedback of measured device 15.
Refer to Fig. 2, Fig. 2 is the process flow diagram of described Test Host 11 operations.After described Test Host 11 starts, according to test request, interference source frequency is set, at a Frequency point, test frequency signal is set, and send described test frequency signal to described monitoring host computer 12.Described monitoring host computer 12 receives the monitoring parameter signal of described data collecting card 13 transmission and the test frequency signal that described Test Host 11 transmits, and judge whether described monitoring parameter exceeds critical field, the limited field of reporting to the police, if described monitoring parameter exceeds critical field, send monitoring parameter abnormal alarm signal.Described Test Host 11 judges whether to receive described monitoring parameter abnormal alarm signal.If not, the test frequency signal of next Frequency point is set, and test frequency signal is sent to described monitoring host computer 12; If so, regulate the intensity of described test signal, make measured device 15 recover normal condition, then, the intensity of described Test Host 11 records test signal now, described monitoring host computer 12 records the monitoring parameter after measured device 15 recovers.So circulation is until whole frequency range test end.
Described monitoring host computer 12 can be for comprising the computing machine of USB interface, RS232 interface.Described monitoring host computer 12 receives, stores the monitoring parameter signal of described data collecting card 13 transmissions and the test frequency signal that described Test Host 11 sends, set up both corresponding relations and show in real time, whether described monitoring host computer 12 exceeds critical field according to the monitoring parameter of default each road signal of bound automatic decision, if exceed, by data collecting card described in usb data alignment 13, sends monitoring parameter abnormal alarm signal.
The function of described monitoring host computer 12 can realize based on Labview platform, be mainly used in voltage, the monitoring of frequency parameter, and real-time display monitoring data value, and can after test finishes, accurately follow the tracks of the monitoring parameter of current frequency values, realize the trackability of monitor data.Described monitoring host computer 12 is very flexible, by selecting different modules to realize peak value, the monitoring of mean value, also can change sampling rate and sampling number as required flexibly, the setting of upper lower limit value is simultaneously also very simple, and back-end data is stored and checked also very convenient.
Refer to Fig. 3, Fig. 3 is the process flow diagram of described monitoring host computer 12 operations.After described monitoring host computer 12 starts, wait for the synchronizing signal that described Test Host 11 sends, the test frequency signal that described Test Host 11 sends.When test frequency signal is not received in described monitoring host computer 12 judgements, described monitoring host computer 12 is in waiting status; When described monitoring host computer 12 is received test frequency signal, expression Test Host 11 has been started working, now, described monitoring host computer 12 is triggered, described monitoring host computer 12 receives the monitoring parameter that described data collecting card 13 gathers, and the voltage amplitude and the frequency that record the frequency of test frequency point and the pilot signal of correspondence are preserved as report data.During each parameter measurement, described monitoring host computer 12 will adopt the restraining line of preset value to compare, the scope if monitoring parameter is above standard, described monitoring host computer 12 will send monitoring parameter abnormal alarm signal, carries out subsequent operation after receiving described monitoring parameter abnormal alarm signal by described Test Host 11; The scope if monitoring parameter is not above standard, described monitoring host computer 12 is got back to waiting status, waits for the test frequency signal that receives next Frequency point.So circulation is until whole frequency range test end.
Monitoring host computer 12 record analyses in supervisory system of the present invention, carry out the judgement of acceptable standard, and time the indication of reporting to the police exactly.During for the born maximum interference strength signal (Threshold level) of the measured device of needs records, monitoring host computer 12 also can send this maximum interference strength signal to Test Host 11, Test Host 11 is just automatically adjusted and is applied intensity, this has just improved the accuracy of test result greatly, for the parameter real-time change of monitoring is also clear, has reflected accurately.
In order to make immunity to interference multi-channel parameter monitor system operation of the present invention easier, further, immunity to interference multi-channel parameter supervisory system of the present invention also provides man machine operation interface, comprise that parameter arranges runnable interface, voltage based on pilot signal, frequency display interface, test result data interface and Test Host interface.Described Test Host interface has been used for the setting to RS232 and gpib bus, thereby makes Test Host 11 and monitoring host computer 12 form unified integral body, and collaborative work.Described test result data interface can be TXT document, the monitor data being about in test process will be stored in TXT document, inclusion information comprises frequency test signal, measured signal voltage amplitude, measured signal Frequency and Amplitude and monitored channel number, is easy to read and editor.
Described parameter arranges runnable interface and comprises two parts, and wherein a part sets in advance the warning limited field of test channel way, every road voltage and frequency monitoring for operating personnel; Another part can be monitored picture, as sample waveform picture, for showing multichannel real-time sampling waveform.When alert event occurs, the LED on top, interface shows will be by the green redness that is transformed into.
In the voltage based on pilot signal, frequency display interface, when Test Host 11 starts to test, monitoring host computer 12 records voltage (V) and the frequency values (f) of the measured signal based on test frequency (F) simultaneously, with test frequency as horizontal ordinate, measured parameter amplitude is drawn V-F and f-F oscillogram as ordinate, makes observation become easily directly perceived.After test finishes, this oscillogram can as a result of offer tester together with data file, really accomplishes that both pictures and texts are excellent.
The man machine operation interface of immunity to interference multi-channel parameter supervisory system of the present invention is developed based on graphic programming instrument Labview platform, adopts multiple bus mastering mode to come connection device data acquisition and system communication work.The bus being specifically related to has RS232, USB, and GPIB, by these control buss, by data collecting card 13, data acquisition unit 14, Test Host 11, monitoring host computer 12 connect collaborative work.Have the construction cycle short, less input, friendly interface, the advantage such as workable.The measurement of voltage amplitude value and frequency values signal can be realized, sample rate and the sampling way configuration of multichannel can be realized, can recording parameters measurement result, compounding practice platform reaches the multichannel real-time monitoring object of high-level efficiency.Make system there is the controllability of higher automaticity and height.
Compared with prior art, immunity to interference multi-channel parameter supervisory system of the present invention, adopt hyperchannel growth data capture card 13 parameter of need monitoring to be sent to monitoring host computer 12, the limit value of each road signal is set on monitoring host computer 12, data are recorded in the database of monitoring host computer 12, by monitoring host computer 12, realize the automatic decision of signal acceptable standard.As signal exceeds limit value, monitoring host computer 12 alarm Test Engineers.When maximum interference strength signal need to record, monitoring host computer 12 also can send this maximum interference strength signal to Test Host 11.It is few that immunity to interference multi-channel parameter supervisory system of the present invention has realized monitoring instrument, takes up an area littlely, and human resources are economized, and accuracy is good, and efficiency is high, monitor data real time record, the feature of favorable repeatability.Immunity to interference multi-channel parameter supervisory system of the present invention is conducive to provide for auto parts and components both domestic and external manufacturer the high-quality detection service that meets particular requirement, be conducive to improve the quality of relevant auto parts and components product, thus the better particularly development of native country automobile industry of propelling vehicle industry.
Without departing from the spirit and scope of the present invention in the situation that, can also form many embodiment that have very big difference.Should be appreciated that except as defined by the appended claims, the present invention is not limited at the specific embodiment described in instructions.
Claims (10)
1. an immunity to interference multi-channel parameter supervisory system, comprises Test Host, monitoring host computer, data acquisition unit and at least one data collecting card, it is characterized in that;
Described data collecting card gathers the monitoring parameter of the multi-channel test passage of measured device, and the parameter signal collecting is sent to described monitoring host computer;
Described monitoring host computer receives the parameter signal of described data collecting card transmission and the test signal that described Test Host sends, and judge whether described monitoring parameter exceeds warning limited field, if described monitoring parameter exceeds warning limited field, described monitoring host computer sends monitoring parameter abnormal alarm signal;
Described data acquisition unit receives described monitoring parameter abnormal alarm signal, and described monitoring parameter abnormal alarm signal is transmitted to described Test Host;
Described Test Host arranges interference source frequency according to test request, and send described test signal to described monitoring host computer, the frequency of described test signal is described interference source frequency, described Test Host receives described monitoring parameter abnormal alarm signal, and according to described monitoring parameter abnormal alarm signal, adjust the intensity of described test signal, and the test signal after adjusting is sent to described monitoring host computer.
2. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, is characterized in that, the measured signal voltage amplitude that described monitoring parameter is described measured device and measured signal Frequency and Amplitude.
3. immunity to interference multi-channel parameter supervisory system as claimed in claim 2, is characterized in that, described monitoring host computer records the frequency of described test signal, described measured signal voltage amplitude, described measured signal Frequency and Amplitude.
4. immunity to interference multi-channel parameter supervisory system as claimed in claim 3, is characterized in that, described monitoring host computer is recorded in the frequency of described test signal, described measured signal voltage amplitude, described measured signal Frequency and Amplitude in TXT document.
5. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, is characterized in that, described monitoring host computer adopts the mode of default bound, and whether monitoring parameter exceeds described warning limited field described in automatic decision.
6. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, it is characterized in that, described monitoring host computer is the computing machine that comprises USB interface, RS232 interface, described monitoring host computer receives described monitoring parameter by described USB interface, and described monitoring host computer receives described test signal by described RS232 interface.
7. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, is characterized in that, described Test Host comprises general purpose interface bus, and described Test Host receives described monitoring parameter abnormal alarm signal by described general purpose interface bus.
8. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, it is characterized in that, described monitoring host computer sends to described data collecting card by described monitoring parameter abnormal alarm signal, and described data collecting card is transmitted to described data acquisition unit by described monitoring parameter abnormal alarm signal.
9. immunity to interference multi-channel parameter supervisory system as claimed in claim 1, it is characterized in that, also comprise that parameter arranges runnable interface, for setting in advance the warning limited field of the test channel way of described measured device, the voltage of every road measured signal and frequency monitoring and for monitored picture.
10. immunity to interference multi-channel parameter supervisory system as claimed in claim 2, is characterized in that, also comprises voltage, frequency display interface based on measured signal, for recording described measured signal voltage amplitude, measured signal Frequency and Amplitude.
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| CN103091583B (en) * | 2013-01-15 | 2015-02-04 | 中联重科股份有限公司 | Engineering machinery electromagnetic compatibility analysis device, system and method and engineering machinery |
| MY193293A (en) * | 2017-12-08 | 2022-10-03 | Ceedtec Sdn Bhd | General purpose interface bus (gpib) sniffer system and method |
| CN108172153B (en) * | 2017-12-27 | 2021-08-13 | 苏州华兴源创科技股份有限公司 | Liquid crystal module aging testing device and equipment comprising same |
| CN108535568B (en) * | 2018-04-18 | 2021-02-19 | 云南电网有限责任公司怒江供电局 | Anti-radio frequency interference capability test method and integrated automation system tester |
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| WO2008123282A1 (en) * | 2007-03-29 | 2008-10-16 | Nec Corporation | Noise immunity evaluation apparatus |
| CN101702015A (en) * | 2009-11-02 | 2010-05-05 | 浙江省计量科学研究院 | Radio frequency electromagnetic field radiation immunity experiment test device and test method for electric energy meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008123282A1 (en) * | 2007-03-29 | 2008-10-16 | Nec Corporation | Noise immunity evaluation apparatus |
| CN101702015A (en) * | 2009-11-02 | 2010-05-05 | 浙江省计量科学研究院 | Radio frequency electromagnetic field radiation immunity experiment test device and test method for electric energy meter |
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