CN101344556A - Method for enlarging effective dynamic range in electromagnetic compatibility test - Google Patents
Method for enlarging effective dynamic range in electromagnetic compatibility test Download PDFInfo
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- CN101344556A CN101344556A CNA2008101195529A CN200810119552A CN101344556A CN 101344556 A CN101344556 A CN 101344556A CN A2008101195529 A CNA2008101195529 A CN A2008101195529A CN 200810119552 A CN200810119552 A CN 200810119552A CN 101344556 A CN101344556 A CN 101344556A
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Abstract
The invention discloses an effective dynamic-scope enlarging method adopted in an electromagnetic compatibility test. The method includes the following steps: an apparatus required by a test experiment is initialized; a signal sent by an antenna is swept to get an antenna output voltage curve; a maximum of the output voltage is obtained; the difference a between the dynamic scope of a frequency spectrograph and the maximum of output voltage is obtained through computation; a maximum of an antenna factor curve is marked as b; if a is greater than b, a correction factor is written into the frequency spectrograph; if a is less than b, the antenna factor minus (b minus a) and then the result is written into the frequency spectrograph and the spectrum curve of a field intensity to be tested is obtained by the frequency spectrograph after frequency sweeping; the data obtained through the frequency sweeping by the frequency spectrograph is transmitted to a computer for data compensation to get the spectrum curve of an authentic field intensity. The invention guarantees by regulating the antenna factor that the spectrum curve of the field intensity to be tested which is displayed on the frequency spectrograph cannot exceed the dynamic scope of the frequency spectrograph and the spectrum curve displayed on the frequency spectrograph is just less than the authentic spectrum curve of the field intensity to be tested by a (b minus a) value on the whole without difference on appearance so as to lead testers to be capable of observing the timely spectrum of the field intensity to be tested.
Description
Technical field
The present invention relates to the electromagnetic compatibility test technical field, specifically, be meant the method that increases effective dynamic range in a kind of electromagnetic compatibility test.
Background technology
The dynamic range of frequency spectrograph is meant the ratio of the maximum that can survey simultaneously and the amplitude of minimum signal.Be often referred to the best incoming signal level that never adds when decay and rise, until the signal amplitude variation range till the minimum available signal level.
In electromagnetic compatibility test, antenna, current probe etc. need be monitored its value by frequency spectrograph or receiver as receiving equipment, and frequency spectrograph is by the computer software control.Because antenna output end output is not real field intensity value but magnitude of voltage, so the signal that frequency spectrograph receives not is the field intensity value at antenna, probe place.In order to obtain the actual value in corresponding electric field, magnetic field, need revise the data that frequency spectrograph receives, promptly need frequency spectrograph is added antenna factor.Antenna factor AF is defined as
Because antenna factor is bigger sometimes, revised test data values may surpass the effective dynamic range of frequency spectrograph, be the measurement range of the actual value in electric field, magnetic field greater than frequency spectrograph, cause the illusion of frequency spectrograph overload, frequency spectrograph can not normally show revised field intensity frequency spectrum.
If the data to test do not add correction, the measurement numerical value of frequency spectrograph generally can not surpass dynamic range.But the signal spectrum of frequency spectrograph demonstration is not the frequency spectrum of electromagnetic field in this case, but the frequency spectrum of the voltage signal of antenna output end.Because correction factor is along with frequency changes, so voltage signal spectrum curve and the electromagnetic field spectrum curve that records on the frequency spectrograph has very big-difference in this case, thereby can not be on frequency spectrograph real-time monitored arrive the frequency spectrum of field intensity to be measured.
Summary of the invention
The present invention is directed to the shortcoming of prior art, the method that increases effective dynamic range in a kind of electromagnetic compatibility test is provided, when guaranteeing to be no more than the dynamic range of frequency spectrograph, effectively show the spectrum curve of electromagnetic field to be measured.
The present invention realizes as follows:
Step 1: initialization is carried out in testing experiment equipment needed thereby frequency spectrograph source etc.;
Step 2: by frequency spectrograph the signal of antenna output is swept frequency one time, obtain antenna output voltage curve;
Step 3:, obtain the maximal value of output voltage by the output voltage curve.Maximal value poor of frequency spectrograph dynamic range maximal value and output voltage tried to achieve in calculating, is designated as a, and the maximal value of antenna factor curve is designated as b;
Step 4: if a＞b writes frequency spectrograph to antenna factor; If a＜b writes frequency spectrograph (correction factor of all frequencies deducts same value) after antenna factor being deducted (b-a) again, obtain the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep.
Step 5: the data that the frequency spectrograph frequency sweep is obtained export to computer, if at this moment a＞b obtains the real frequency spectrum that data have been field intensity, uncompensation; If a＜b compensates the spectrum curve of field intensity, promptly add (b-a), obtain real field intensity spectrum curve.
The present invention is in advantage: by adjusting antenna factor, guarantee that the spectrum curve of the field intensity to be measured that shows can not surpass the dynamic range of frequency spectrograph on frequency spectrograph.Spectrum curve that shows on the frequency spectrograph and the real spectrum curve of field intensity to be measured just differ from (b-a) value on the whole, and do not have difference in appearance, thus the tester can real-time monitored to the frequency spectrum of field intensity to be measured.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is the antenna factor curve of institute's use antenna among the embodiment;
The voltage curve that Fig. 3 obtains for step 2 among the embodiment;
The field intensity spectrogram that Fig. 4 obtains for embodiment step 4 intermediate frequency spectrometer frequency sweep;
The real field intensity spectrum curve of Fig. 5 for obtaining after the spectrum curve of field intensity being compensated in the embodiment step 5;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
In the electromagnetic compatibility test test, after initialization is carried out in testing experiment equipment needed thereby frequency spectrograph source etc., antenna factor be write in the frequency spectrograph obtaining field intensity signal, but may cause frequency spectrograph to transship like this recording signal value correction.At this problem, the present invention writes frequency spectrograph after above-mentioned antenna factor is adjusted again, thereby guarantees effective demonstration of frequency spectrograph.Again the data that derive are compensated at last, obtain real field intensity signal spectrum curve.The method of increase frequency spectrograph effective dynamic range of the present invention realizes by following concrete steps, flow process as shown in Figure 1:
Step 1: initialization is carried out in testing experiment equipment needed thereby frequency spectrograph source etc.;
Step 2: by frequency spectrograph the signal of antenna output is swept frequency one time, obtain antenna output voltage curve;
Step 3: by the output voltage curve, obtain the maximal value of output voltage, calculate the poor of the maximal value try to achieve frequency spectrograph dynamic range maximal value and output voltage, be designated as a, the maximal value of antenna factor curve is designated as b;
Step 4: if a＞b, the electromagnetic field spectrum curve that obtains after to the correction of output voltage curve with the antenna factor curve can not surpass the effective dynamic range of frequency spectrograph, can directly revise output voltage, obtain the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep by antenna factor; If a＜b, the electromagnetic field spectrum curve that obtains after to the correction of output voltage curve with the antenna factor curve can surpass the dynamic range of frequency spectrograph, then adjust by revising antenna factor, by adjusted antenna factor output voltage is revised, obtained the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep.
The concrete method of adjusting antenna factor is: antenna factor is deducted (b-a), the reason that deducts (b-a) is directly by antenna factor output voltage to be revised, and the maximum overload that frequency spectrograph is produced is (b-a).
Step 5: the data that the frequency spectrograph frequency sweep is obtained export to computer, if a＞b, what at this moment obtain data and be field intensity really is frequency spectrum, uncompensation; If a＜b compensates the spectrum curve of field intensity, promptly add (b-a), obtain real field intensity spectrum curve.
Embodiment
Employed frequency spectrograph dynamic range is 7dB μ V to 120dB μ V (80dB demonstration) in the following experiment, antenna factor curve such as Fig. 2, the maximal value of antenna factor curve is designated as b=80dBpT/ μ V, carries out the effective dynamic range of frequency spectrograph according to following steps and regulate:
Step 1: initialization is carried out in testing experiment equipment needed thereby frequency spectrograph source etc.;
Step 2: by frequency spectrograph the signal of antenna output is swept frequency one time, the voltage curve that obtains antenna output as shown in Figure 3;
Step 3: by the output voltage curve, the maximal value that obtains output voltage is 80dB μ V, and the difference of calculating the maximal value 80dB μ V that tries to achieve frequency spectrograph dynamic range maximal value 120dB μ V and output voltage is a=40dB;
Step 4: because a＜b, antenna factor is adjusted, the maximal value of antenna factor deducts (b-a)=40dBpT/ μ V, by adjusted antenna factor output voltage is revised, the spectrum curve that obtains field intensity to be measured after the frequency spectrograph frequency sweep as shown in Figure 4, this time-frequency spectrometer nonoverload as can be seen;
Step 5: the data that the frequency spectrograph frequency sweep is obtained export to computing machine, step 4 pair antenna factor is adjusted, therefore need compensate data, all frequencies on the spectrum curve of field intensity are added 40dB, obtain final field intensity spectrum curve, what as shown in Figure 5, the field intensity spectrum curve was complete is presented in the frequency spectrograph effective dynamic range.
Claims (3)
1, increase the method for effective dynamic range in a kind of electromagnetic compatibility test, realize as follows:
Step 1: initialization is carried out in testing experiment equipment needed thereby frequency spectrograph source etc.;
Step 2: by frequency spectrograph the signal of antenna output is swept frequency one time, obtain antenna output voltage curve;
Step 3:, obtain the maximal value of output voltage by the output voltage curve; Maximal value poor of frequency spectrograph dynamic range maximal value and output voltage tried to achieve in calculating, is designated as a, and the maximal value of antenna factor curve is designated as b;
Step 4: if a＞b writes frequency spectrograph to antenna factor; If a＜b writes frequency spectrograph after antenna factor being deducted (b-a) again, obtain the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep;
Step 5: the data that the frequency spectrograph frequency sweep is obtained export to computer, if at this moment a＞b obtains the real frequency spectrum that data have been field intensity, uncompensation; If a＜b compensates the spectrum curve of field intensity, promptly add (b-a), obtain real field intensity spectrum curve.
2, increase the method for effective dynamic range in a kind of electromagnetic compatibility test as claimed in claim 1, be characterised in that: in the step 4, if a＞b, the electromagnetic field spectrum curve that obtains after to the correction of output voltage curve with the antenna factor curve can not surpass the dynamic range of frequency spectrograph, directly output voltage is revised, obtained the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep by antenna factor; If a＜b, the electromagnetic field spectrum curve that obtains after to the correction of output voltage curve with the antenna factor curve can surpass the dynamic range of frequency spectrograph, then adjust by revising antenna factor, by adjusted antenna factor output voltage is revised, obtained the spectrum curve of field intensity to be measured after the frequency spectrograph frequency sweep.
3, increase the method for effective dynamic range in a kind of electromagnetic compatibility test as claimed in claim 2, it is characterized in that: described correction antenna factor is that antenna factor deducts (b-a).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101195529A CN101344556B (en) | 2008-09-03 | 2008-09-03 | Method for enlarging effective dynamic range in electromagnetic compatibility test |
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| CN2008101195529A CN101344556B (en) | 2008-09-03 | 2008-09-03 | Method for enlarging effective dynamic range in electromagnetic compatibility test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466761A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method and system for obtaining completed spectral data and apparatuses |
| CN109655693A (en) * | 2018-12-29 | 2019-04-19 | 广东省医疗器械质量监督检验所 | A kind of device and test method for the test of electromagnetic compatibility power frequency frequency multiplication magnetic field |
| CN109917217A (en) * | 2019-04-24 | 2019-06-21 | 中国科学院长春光学精密机械与物理研究所 | Parameter compensation method, system and associated component for electromagnetic compatibility standard test |
-
2008
- 2008-09-03 CN CN2008101195529A patent/CN101344556B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466761A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method and system for obtaining completed spectral data and apparatuses |
| CN102466761B (en) * | 2010-11-03 | 2015-05-20 | 北京普源精电科技有限公司 | Method and system for obtaining completed spectral data and apparatuses |
| CN109655693A (en) * | 2018-12-29 | 2019-04-19 | 广东省医疗器械质量监督检验所 | A kind of device and test method for the test of electromagnetic compatibility power frequency frequency multiplication magnetic field |
| CN109655693B (en) * | 2018-12-29 | 2023-12-12 | 广东省医疗器械质量监督检验所 | Device and method for electromagnetic compatibility power frequency doubling magnetic field test |
| CN109917217A (en) * | 2019-04-24 | 2019-06-21 | 中国科学院长春光学精密机械与物理研究所 | Parameter compensation method, system and associated component for electromagnetic compatibility standard test |
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