CN101344560B - Method for adjusting output amplitude of signal source in electromagnetic compatibility sensitivity test - Google Patents
Method for adjusting output amplitude of signal source in electromagnetic compatibility sensitivity test Download PDFInfo
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- CN101344560B CN101344560B CN2008101196358A CN200810119635A CN101344560B CN 101344560 B CN101344560 B CN 101344560B CN 2008101196358 A CN2008101196358 A CN 2008101196358A CN 200810119635 A CN200810119635 A CN 200810119635A CN 101344560 B CN101344560 B CN 101344560B
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Abstract
The invention discloses a signal source output amplitude regulating method adopted in an electromagnetic compatibility (EMC) sensitivity test, including the following steps: a measured amplitude E0 can be obtained through a monitoring apparatus according to an initial value S of a signal source; a difference Delta E between the measured value and a standard ultimate value E1 is computed; a proportion factor Alpha is set to get a stepping Delta E ' to lead the signal source to be added by Delta E ' on the basis of the original initial value to get a new amplitude S ' and then a new measured amplitude E0' can be obtained through the monitoring apparatus; a threshold value X is set and whether an absolute value of E0 minus E0' exceeds the range of the threshold value is checked. The intensity value of the interruption signals measured by the monitoring apparatus can achieve the ultimate value range of military standard by regulating the signal source output amplitude by the invention, thus guaranteeing the accuracy of EMC sensitivity test results, reducing test time and enhancing test efficiency.
Description
Technical field
The invention belongs to the electromagnetic compatibility sensitivity field tests, be specifically related to the method for conditioning signal source output amplitude in a kind of electromagnetic compatibility sensitivity test.
Background technology
According to GJB151A-97 " military equipment and subsystem Electromagnetic Launching and susceptibility require " regulation, electromagnetic compatibility test comprises electromagnetic interference (EMI) test and electromagnetic susceptibility (EMS) test two large divisions, and wherein the electromagnetic susceptibility test comprises conducted susceptibility and radiosensitivity test again.The ultimate principle of susceptibility test is to disturb generation equipment to produce the electromagnetic interference (EMI) of certain magnitude, as shown in Figure 1, use radiating antenna to produce in the radiosensitivity test and add radiated electric field or magnetic field, the output of signal source is by the gain of power amplifier and antenna, surveillance equipment can measure corresponding field intensity, PC is by programmed control, can be according to the regulation of GJB151A-97 standard for the field intensity ultimate value, output amplitude to signal source is adjusted, and makes it reach the desired ultimate value of GJB151A-97 standard.Lose time very much and manually signal source is regulated, so use automated EMC test system respectively each frequency of test specimen to be carried out the automatic adjusting of signal source amplitude.Signal source is carried out in the automatic adjusting of amplitude in automated EMC test system, need to adopt certain method to make its amplitude not cause the inaccurate of test as far as possible with ultimate value is too wide in the gap.
Use current injection device to inject the Conduction Interference electric current in the conducted susceptibility test, the responsive phenomenon of facilities for observation is if sensitivity should be noted responsive frequency, responsive phenomenon and responsive threshold value.As shown in Figure 2, use current injection device interference current intensity to be joined on the power lead of test specimen in the conducted susceptibility test, surveillance equipment monitors by monitoring probe whether the strength of current that is added on the test specimen power lead reaches the limit system of regulation then.The programmed control meeting of PC is according to the output amplitude in the measured strength of current value conditioning signal source of surveillance equipment, and the interference current intensity that is added reaches the standard limit value.
In existing electromagnetic susceptibility test, generally adopt the automatic control signal source to regulate the method for amplitude.Each frequency for the needs test, the amplitude that measures according to surveillance equipment, set fixing step value, the initial value of signal source is added the new output valve of this step value as signal source, surveillance equipment can measure new amplitude, continuation and standard limit value compare then, and so circulation goes on, and the amplitude of measuring up to surveillance equipment reaches the standard limit value.This technical scheme can guarantee as far as possible that again the final output amplitude of signal source can reach the ultimate value of prescribed by standard simultaneously controlling automatically under the prerequisite that improves test efficiency.
This method exists two shortcomings:
1. if less according to the signal source initial value at the output amplitude that surveillance equipment measures, owing to set step value, may need repeatedly to circulate for what fix, the measured value of surveillance equipment can reach the standard limit value, causes the inefficiency of test.
2. if more approaching in the output amplitude criterion distance ultimate value that surveillance equipment measures according to the signal source initial value, the signal source initial value ultimate value that just may be above standard in stepping next time makes that the experimental measurement data are inaccurate.
Summary of the invention
The present invention is directed to the problem that exists in the existing amplitude adjustment process, propose the method for conditioning signal source output amplitude in a kind of electromagnetic compatibility sensitivity test.This method is according to the sensitivity testing method of electromagnetic compatibility, and the step value of adjusting for amplitude changes according to certain number percent, adjusts amplitude by the mode of continuous adjustment step value.The method of concrete conditioning signal source output amplitude is as follows:
Step 1: according to the initial value S of signal source, the unit of S is dBm, obtains one by surveillance equipment and measures amplitude E
0
Step 2: calculate and measure amplitude E
0With standard limit value E
1Difference DELTA E, Δ E unit is dB;
Step 3: set a scale-up factor α ,-1≤α≤1 obtains step value Δ E ', and Δ E ' unit is dB.
Signal source increases Δ E ' again on the basis of original initial value S, obtain new amplitude S ', and the unit of S ' is dBm, obtains new measurement amplitude E ' by surveillance equipment then
0
Step 4: set a threshold X, relatively | E
1-E '
0| with the size of X.
If | E
1-E '
0|＞X then turns back to step 2 circulation;
Otherwise, think amplitude E '
0Reach army's mark standard, proceed the amplitude adjustment of next frequency.
Wherein X determines according to the requirement of concrete test, generally gets | X|≤1dB.
Above-mentioned measurement amplitude E
0With standard limit value E
1Be electric field intensity, magnetic induction density or strength of current.
The invention has the advantages that:
1, the time of minimizing experimental test, improve the efficient of test.
2, by the adjustment to the signal source output amplitude, the field intensity value that surveillance equipment measures can both reach the ultimate value scope of military standard, guaranteed the electromagnetic compatibility test result accurately.
Description of drawings
Fig. 1 is electromagnetic radiation sensitivity degree test block diagram;
Fig. 2 is electromagnetism conducted susceptibility test block diagram;
Fig. 3 is that signal source amplitude of the present invention is regulated process flow diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
According to the sensitivity testing method of electromagnetic compatibility, realize the amplitude adjustment by the method that changes step value.Concrete signal source amplitude control method is divided into following several steps, process flow diagram as shown in Figure 3:
Step 1: according to the initial value S of signal source, the unit of S is dBm, obtains one by surveillance equipment and measures amplitude E
0
Wherein measure amplitude E
0With standard limit value E
1Be electric field intensity, magnetic induction density or strength of current.
Step 2: calculate and measure amplitude E
0With standard limit value E
1Difference DELTA E.Theoretically, add Δ E for signal source initial value S, just can make the radiation intensity of antenna reach standard limit value E
1, but because in actual tests, the amplification of signal source output power is not linear, ultimate value E might directly be above standard
1, cause test figure inaccurate, so can not directly add Δ E.
Step 3: set a scale-up factor α ,-1≤α≤1 obtains step value Δ E '.
Step value Δ E ' obtains according to following formula:
ΔE′＝ΔE-α×ΔE，
Signal source increases Δ E ' again on the basis of original initial value S, obtain new amplitude S ', obtains new measurement amplitude E ' by surveillance equipment then
0
Step 4: set a threshold X, relatively | E
1-E '
0| with the size of X.
If | E
1-E '
0|＞X then turns back to step 2 circulation;
Otherwise, think amplitude E '
0Reach army's mark standard, proceed the amplitude adjustment of next frequency.
Wherein X determines according to the requirement of concrete test, generally gets | X|≤1dB.
The initial value of supposing signal source is S=-60dBm (47dBuV), can measure corresponding electric field intensity measuremenrt amplitude E by surveillance equipment
0=120dBuV/m, standard limit value E
1Be 166dBuV/m, measure amplitude E
0With the difference DELTA E of standard limit value E1 be 46dB, supposing that each circulation needs the residence time of 2s.
The preset proportion factor alpha is 20%, and threshold X is ± 1dB, concrete set-up procedure such as table 1, for:
Table 1 the present invention carries out the process that amplitude is adjusted
| Step | The stepping amplitude E ' of signal source 0(dB)? | Signal source output amplitude S ' (dBm) | The numerical value E ' that surveillance equipment records 0(dBuV/m)? | With standard limit value difference DELTA E (dB) |
| 1? | 46-46×20％＝36.8? | -60+36.8＝-23.2? | 150? | 16? |
| 2? | 16-16×20％＝12.8? | -23.2+12.8＝-10.4? | 165.5? | 0.5? |
From table 1, can obtain, when amplitude proceeded to for second step according to step value, | E
0-E '
0|＜X, reach the preset threshold scope, can finish the amplitude adjustment this moment.
Can obtain from the above embodiments, technical solution of the present invention can reach the preset threshold scope, has 2 step circulations simultaneously, only needs time of 4s to finish the test of a frequency.
In the prior art scheme, setting threshold is ± 1dBuV/m that fixing stepping amplitude is set to 5dB, concrete amplitude set-up procedure such as table 2:
Table 2 prior art is carried out the process that amplitude is adjusted
In table 2, by adding up of fixing stepping amplitude, according to the output amplitude of signal source, the numerical value that records from surveillance equipment can not reach the pre-set threshold scope, the prior art scheme has been carried out the circulation of 10 steps at present simultaneously, and the numerical value that surveillance equipment records has surpassed standard limit value E
1, and | E
1-E '
0|＞X, the time of use 20s can't be finished the test of this frequency.System-level electromagnetic compatibility test reaches up to ten thousand frequencies, and carrying out frequency according to prior art, to test the needed time be very long, and technical solution of the present invention will be far superior to the prior art scheme on the efficient of test and accuracy.
Claims (3)
1. the method for conditioning signal source output amplitude in the electromagnetic compatibility sensitivity test is characterized in that comprising the steps:
Step 1: according to the initial value S of signal source, the unit of S is dBm, obtains one by the field intensity monitor and measures amplitude E
0
Step 2: calculate and measure amplitude E
0With standard limit value E
1Difference DELTA E, Δ E unit is dB;
Step 3: set a scale-up factor α ,-1≤α≤1 obtains step value Δ E ', and Δ E ' unit is dB; Signal source increases Δ E ' again on the basis of original initial value S, obtain new amplitude S ', obtains new measurement amplitude E ' by the field intensity monitor then
0Step value Δ E ' obtains according to following formula:
ΔE′＝ΔE-α×ΔE；
Step 4: set a threshold X, relatively | E
1-E '
0| with the size of X;
If | E
1-E '
0|＞X then turns back to step 2 circulation;
Otherwise, think amplitude E '
0Reach army's mark standard, proceed the amplitude adjustment of next frequency.
2. the method for conditioning signal source output amplitude in a kind of electromagnetic compatibility sensitivity test according to claim 1 is characterized in that: described measurement amplitude E
0With standard limit value E
1Be in electric field intensity, magnetic induction density or the strength of current any one.
3. the method for conditioning signal source output amplitude in a kind of electromagnetic compatibility sensitivity test according to claim 1 is characterized in that: X determines according to the requirement of concrete test in the step 4, | X|≤1dB.
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| CN102128990B (en) * | 2011-01-24 | 2013-05-08 | 北京航空航天大学 | Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test |
| CN103823135B (en) * | 2014-02-24 | 2016-02-03 | 北京航空航天大学 | A kind of multifrequency high-speed sensibility that is used for tests intermediate-frequeney point amplitude adjustment method |
| CN109946638B (en) * | 2019-04-01 | 2021-01-08 | 山西省计量科学研究院 | Device and method for automatically detecting radiation immunity of electric energy meter based on residence time self-adaption and pulse lamp flicker identification |
| CN111338230B (en) * | 2019-10-09 | 2023-02-28 | 中国舰船研究设计中心 | Method for determining forced power failure magnetic sensitivity threshold of speed boat |
| CN113866516B (en) * | 2021-09-30 | 2022-05-10 | 北京航空航天大学 | Signal source amplitude adjustment method and device based on noise floor area judgment |
| CN114778994A (en) * | 2022-06-17 | 2022-07-22 | 扬芯科技(深圳)有限公司 | Electromagnetic interference test equipment and method |
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| CN101191806A (en) * | 2006-11-29 | 2008-06-04 | 比亚迪股份有限公司 | Apparatus and method for testing automobile electromagnetic sensitivity |
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