CN101377534A - Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test - Google Patents
Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test Download PDFInfo
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- CN101377534A CN101377534A CNA2008102228746A CN200810222874A CN101377534A CN 101377534 A CN101377534 A CN 101377534A CN A2008102228746 A CNA2008102228746 A CN A2008102228746A CN 200810222874 A CN200810222874 A CN 200810222874A CN 101377534 A CN101377534 A CN 101377534A
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Abstract
The invention provides a method for setting an initial value the amplitude of a signal source in an electromagnetic compatibility sensitivity test, which introduces a pre-minus value B and a difference value C between standard prescriptive ultimate values of the current frequency point and the frequency point prior to the current frequency point; wherein, B is equal to k*alfa equal to k*(f2-f1)/f1, and C is equal to Vlim(f2)-Vlim(f1). The amplitude initial value V(f20) of the signal source of the current frequency point is set at V(f20) equal to (f11)+C-B on the basis of the final amplitude of the last frequency point, so that the amplitude initial value of the current signal source is close to the target amplitude, and the step regulation is carried out on the basis of the set initial value of the invention. The method can flexibly set the initial value with full consideration to the characteristics of the gain variation of a power amplifier, the amplitude of the stepped frequency and the variation of the standard prescriptive ultimate value, and can meet the requirements of the standard prescriptive ultimate value via little regulation under the same amplitude regulation proposal, thereby shortening the regulation time and improving the testing speed.
Description
Technical field
The invention belongs to the electromagnetic compatibility technical field of test automatically, relate to the method that the signal source amplitude initial value is set in a kind of electromagnetic compatibility sensitivity test.
Background technology
Electromagnetic compatibility sensitivity is meant the sensitivity to electromagnetic interference (EMI) such as equipment, subsystem.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 test and radiosensitivity test again.
The purpose of electromagnetic radiation sensitivity degree test is the ability that the examination test specimen bears the external electromagnetic field radiation.As shown in Figure 1, electromagnetic radiation sensitivity degree Auto-Test System generally is made up of signal source, power amplifier, radiating antenna, field sensor, surveillance equipment, PC.The signal source output signal transfers to the input end of power amplifier through radio-frequency cable, power amplifier output terminal output high-power signal is to radiating antenna excitation end, radiating antenna produces the undesired signal of certain intensity under the high-power signal excitation, the intensity that adds undesired signal that surveillance equipment collection and display field sensor receive at place, test specimen position, PC connects the control port of signal source and surveillance equipment respectively, the comparative result of the ultimate value that adds interference signal intensity and standard code that receives according to surveillance equipment, the parameter setting that comes the control signal source.
As shown in Figure 2, electromagnetism conducted susceptibility Auto-Test System generally is made up of signal source, power amplifier, injection device, supervision probe, surveillance equipment, PC, and test is carried out on the power lead of test specimen.Use injection device to inject the Conduction Interference electric current in the test of electromagnetism conducted susceptibility, the responsive phenomenon of facilities for observation is if sensitivity is then noted responsive frequency, responsive phenomenon and responsive threshold value.As shown in Figure 2, use injection device interference current to be joined on the power lead of test specimen in the conducted susceptibility test, surveillance equipment adds the ultimate value whether current's intensity reaches regulation by monitoring that probe monitors on the test specimen power lead then.The control program of PC can be according to the output amplitude in the measured strength of current value conditioning signal source of surveillance equipment, make add interference current intensity reach the ultimate value of standard code.
In electromagnetic radiation sensitivity degree test, need be in wider frequency add electromagnetic radiation field to investigate the electromagnetic susceptibility of test specimen to what test specimen applied certain intensity.The ultimate value requirement that adds the necessary conformance with standard regulation of interference signal intensity at place, test specimen position, so when each frequency applies interference, need an initial amplitude be set to signal source, adjust the signal source output amplitude with this as the starting point, make and step to the ultimate value that interference signal intensity reaches standard code that adds that field sensor receives next test frequency then and continue test.
In the test of electromagnetism conducted susceptibility, need in wider frequency, use injection device that test specimen is injected the Conduction Interference electric current, then surveillance equipment by monitor probe monitor on the test specimen power lead add the ultimate value whether current's intensity reaches standard code, investigate the electromagnetic susceptibility of test specimen with this.The ultimate value requirement that adds the necessary conformance with standard regulation of current's intensity on the test specimen power lead, so when each frequency applies interference, need an amplitude initial value be set to signal source, adjust the signal source output amplitude with this as the starting point, make on the power lead add the ultimate value that current's intensity reaches standard code, step to next test frequency then and continue test.
In electromagnetic compatibility sensitivity is tested automatically, the setting of amplitude initial value and method of adjustment can not be adjusted arbitrarily with tester's experience as manual test, up to the ultimate value requirement that reaches standard code, the setting of initial value all must be carried out according to the program scheme of a setting in the test automatically.The signal source amplitude initial value is provided with the test efficiency influence very big.
The setting of signal source amplitude initial value mainly contains following dual mode in traditional electromagnetic compatibility sensitivity test:
Prior art one, during the susceptibility test, amplitude initial value is made as a fixed value A.Set when on-test, the amplitude initial value of each frequency all is set to this value A in the process of the test, adjusts with this as the starting point then.
Shortcoming: this method is comparatively stiff, can not change according to the variation of ultimate value, may cause that initial value A is too small to have prolonged the adjustment time, perhaps excessive the and infringement equipment of initial value A.
Prior art two, amplitude initial value are that the final range value A of a last frequency deducts a fixed value B, with this as the starting point signal source are adjusted.For protection equipment, the fixed value B of setting general bigger (representative value 6dB).
Shortcoming: the B value of this method is a fixed value, and dirigibility is less.In power amplifier gain comparatively steadily or number of frequency steps when little, this set will force amplitude initial value too small, prolongs the time of adjusting; For the ultimate value of standard code the frequency of jump is arranged, this method also can cause amplitude initial value distance objective value bigger, prolongs the time of adjusting.
As seen prior art is all more stiff, does not consider the variation of the ultimate value of standard code and power amplifier gain, can not adjust along with experiment, perhaps prolongs the adjustment time to make inefficiency, and perhaps infringement equipment causes unnecessary loss.
Summary of the invention
The invention provides the method that the signal source amplitude initial value is set in a kind of electromagnetic compatibility sensitivity test, it is inflexible that solution prior art amplitude initial value of interference level in sensitivity testing is provided with, and adjustment process is slow, the technical matters of inefficiency.To achieve these goals, method provided by the invention takes into full account the comparatively stable characteristics of small frequency scope internal power amplifier gain, and taken all factors into consideration the variation of the ultimate value of the size of frequency step and standard code, on the basis of the final amplitude of a last frequency, deduct a suitable pre-depreciation, make amplitude initial value approach target amplitude.This method can take into full account the variation characteristics of the ultimate value of the size of variation, frequency step of power amplifier gain and standard code, set amplitude initial value flexibly, under identical amplitude adjustment scheme, can reach the ultimate value requirement of standard code through less adjustment, thereby shorten the adjustment time, improve test speed.
The method that the signal source amplitude initial value is set in a kind of electromagnetic compatibility sensitivity test comprises the steps:
Step 1: for first test frequency, the signalization source amplitude initial value is V (f
10);
Step 2: at V (f
10) the basis on carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
1), note signal source amplitude V (f this moment
11), the dBm of unit;
Step 3: the frequency f that signal source frequency is transferred to second test frequency
2, the pre-depreciation B that signal calculated source amplitude is adjusted; Pre-depreciation B=k α=k (f
2-f
1)/f
1, the dB of unit; Wherein α represents the frequency step ratio, and α=(f
2-f
1)/f
1K represents scale-up factor, and the typical span of k is 100～2000;
Step 4: calculate current frequency and on the difference C of ultimate value of a frequency standard code, and calculate and be provided with the signal source amplitude initial value V (f of current frequency
20).
C=V
Lim(f
2)-V
Lim(f
1), wherein: V
Lim(f
1) be illustrated in the ultimate value of first test frequency standard code, V
Lim(f
2) be illustrated in the ultimate value of second test frequency standard code; Signal source amplitude initial value V (f with current frequency
20) be set to V (f
20)=V (f
11)+C-B carries out the amplitude adjustment according to existing amplitude adjustment scheme, makes the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
2);
Step 5: the frequency of next frequency to be measured is made as f
2, the frequency of current frequency is made as f
1, repeating step three finishes up to all frequency tests to be measured to step 5, finally finishes the susceptibility test.
The measured value of described surveillance equipment and the ultimate value of standard code are any one in electric field intensity, magnetic induction density or the strength of current.
The advantage of signal source amplitude initial value establishing method is in a kind of electromagnetic compatibility sensitivity test of the present invention:
(1) taken into full account the variation of the ultimate value of the size of variation, frequency step of power amplifier gain and standard code.
(2) flexible initialization makes initial value approach target amplitude, can reach the ultimate value requirement of standard code through less adjustment, thereby shorten the adjustment time, improves test speed and conventional efficient.
(3) considered protection, the situation of the excessive damage equipment of amplitude initial value can not occur equipment.
Description of drawings
Fig. 1 is existing electromagnetic radiation sensitivity degree test configurations figure;
Fig. 2 is existing electromagnetism conducted susceptibility test configurations figure;
Fig. 3 is the flow chart of steps of signal source amplitude initial value establishing method in a kind of electromagnetic compatibility sensitivity test of the present invention;
Fig. 4 is the ultimate value curve of certain test institute accepted standard regulation among the embodiment.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Signal source amplitude initial value establishing method in a kind of electromagnetic compatibility sensitivity test, flow process has following steps as shown in Figure 3:
Step 1: for first test frequency, signalization source amplitude is adjusted initial value V (f
10).
Step 2: at V (f
10) the basis on carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measurement of surveillance equipment
Value reaches the ultimate value V of standard code
Lim(f
1), note signal source amplitude V (f this moment
11), the dBm of unit.
Step 3: the frequency f that signal source frequency is transferred to second test frequency
2, the pre-depreciation B that signal calculated source amplitude is adjusted.For protection equipment and test specimen, interference level need begin from the amplitude of the ultimate value that is lower than standard code to increase, and therefore, deducts a pre-depreciation B on the basis of the new frequency initial value of signal source.And the span of frequency is big more, the isoparametric fluctuation of the loss of power amplifier, antenna gain and test loop may be also big more, therefore pre-depreciation B can be provided with reference to the relative size (number percent) of frequency step, bigger pre-depreciation is adopted in bigger stepping, otherwise can adopt less pre-depreciation.Set pre-depreciation B=k α=k (f among the present invention
2-f
1)/f
1, the dB of unit; Wherein α represents the stepping ratio, is percentage, α=(f
2-f
1)/f
1K represents scale-up factor, and typical span is 100～2000, and the k value can be chosen flexibly according to the gain characteristic of power amplifier in span: the k value is bigger, and pre-depreciation is bigger, is beneficial to protection equipment; The k value is less, and pre-depreciation is less, adjust faster, thereby can realize changing the size of initial value.
Step 4: the ultimate value V that calculates in current frequency standard code
Lim(f
2) and at the ultimate value V of a last frequency standard code
Lim(f
1) difference C, difference C=V
Lim(f
2)-V
Lim(f
1).The signal source amplitude initial value V (f of current frequency is set
20).Carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
2).
The signal source amplitude initial value of current frequency is set to V (f
20)=V (f
11)+C-B; Wherein: V
Lim(f
1) represent the ultimate value of standard code of first test frequency, V
Lim(f
2) second ultimate value of testing the standard code of frequency of expression.Difference C is illustrated in the difference of the ultimate value of second test frequency and first test frequency standard code, the dB of unit; V (f
20) signal source amplitude when the measured value of second test of expression frequency reaches the ultimate value of standard code, the dBm of unit.
The measured value of described surveillance equipment and the ultimate value of standard code are electric field intensity (the dB μ V/m of unit), or magnetic induction density (dBpT of unit), or strength of current (the dB μ A of unit).
Step 5: the frequency of next frequency to be measured is made as f
2, the frequency of current frequency is made as f
1Repeating step three finishes up to all frequency tests to be measured to step 5, finally finishes the susceptibility test.
Embodiment 1:
In certain test, the ultimate value of standard code as shown in Figure 4, if the test frequency is when 100MHz steps to 101MHz,
The first step, suppose first the test frequency frequency f
1=100MHz, signalization source amplitude initial value V (f
10), V (f
10The 25dBm of)=-.
Second step served as that the signal source amplitude is adjusted on the basis with-25dBm, amplitude transfers to-reached during 20dBm standard code ultimate value require V
Lim(f
1)=200V/m (166dB μ V/m) notes signal source amplitude V (f this moment
11The 20dBm of)=-.
The 3rd goes on foot, and the frequency of signal source is adjusted to the frequency f of next frequency
2=101MHz calculates pre-depreciation B.This moment frequency step ratio α=(f
2-f
1)/f
1, wherein k is a scale-up factor, gets k=100 in this example, therefore,
B＝k·α＝100×1％＝1dB。
The 4th step, calculate current frequency and on the difference C of ultimate value of a frequency standard code.The ultimate value of standard code is V
Lim(f
2)=100V/m (160dB μ V/m), therefore, C=V
Lim(f
2)-V
Lim(f
1)=160dB μ V/m-166dB μ V/m=-6dB is so according to initial value design method of the present invention, be made as the signal source initial value of current frequency: V (f
20)=V (f
11)+C-B=-20dBm-6dB-1dB=-27dBm.Carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
2).
In the 5th step, the frequency of next frequency to be measured is considered as f
2, the frequency of current frequency is made as f
1=101MHz.Repeating step three finishes up to all frequency tests to be measured to step 5, finally finishes the susceptibility test.
Actual in final the amplitude adjustment, when signal source be output as-during 26.3dBm, apply interference field strength and reach 99V/m, only illustrate on-27dBm amplitude initial value basis, to adjust slightly to get final product.And by prior art one, adjusting initial value in frequency 101MHz signal source still is-20dBm to need repeatedly amplitude adjustment just can reach the ultimate value requirement of standard code.
If get k=200, then according to the present invention program, current frequency 101MHz signal source is adjusted initial value and is:
V (f
20)=V (f
11)+C-k * α=-20dBm-6dB-1% * 200dB=-28dBm; This initial value is also very approaching from final adjusting range-26.3dBm, and illustrate also that on the other hand the k value can choose flexibly according to the gain characteristic of power amplifier in certain scope: the k value is bigger, and pre-depreciation is bigger, is beneficial to protection equipment; The k value is less, and pre-depreciation is less, adjusts faster.
Embodiment 2:In certain test, the ultimate value of testing standard regulation as shown in Figure 4, if the test frequency is when 100MHz steps to 110MHz,
The first step, suppose first the test frequency frequency f
1=100MHz, signalization source amplitude is adjusted initial value V (f
10), V (f
10The 25dBm of)=-.
Second step served as that the signal source amplitude is adjusted on the basis with-25dBm, amplitude transfers to-reached during 20dBm standard code ultimate value require V
Lim(f
1)=200V/m (166dB μ V/m) notes signal source amplitude V (f this moment
11The 20dBm of)=-.
The 3rd goes on foot, and the frequency of signal source is adjusted to the frequency f of next frequency
2=110MHz calculates pre-depreciation B.This moment frequency step ratio α=(f
2-f
1)/f
1, wherein k is a scale-up factor, gets k=100 in this example, therefore,
B＝k·α＝100×10％＝10dB。
The 4th step, calculate current frequency and on the difference C of ultimate value of a frequency standard code.The ultimate value of standard code requires to be V
Lim(f
2)=100V/m (160dB μ V/m), therefore,
C=V
Lim(f
2)-V
Lim(f
1)=160dB μ V/m-166dB μ V/m=-6dB is so according to initial value design method of the present invention, be made as the signal source amplitude initial value of current frequency: V (f
20)=V (f
11)+C-B=-20dBm-6dB-10dB=-36dBm.Carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
2).
In the 5th step, the frequency of next frequency to be measured is considered as f
2, the frequency of current frequency is made as f
1=110MHz.Repeating step three finishes up to all frequency tests to be measured to step 5, finally finishes the susceptibility test.
After adjusting through amplitude, when signal source be output as-during 33dBm, apply interference field strength and reach 100.5V/m, only illustrate on-36dBm amplitude initial value basis, to adjust slightly to get final product.And by prior art one, be adjusted into-20dBm at frequency 110MHz signal source amplitude initial value, the interference field strength that applies like this substantially exceeds the ultimate value of standard code, might cause the damage of equipment.By prior art two, be adjusted into-20dBm at frequency 110MHz signal source amplitude initial value, deducting fixed value 6dBm is-26dBm that the interference field strength that applies has also surpassed the ultimate value of standard code.As seen, using initial value design method of the present invention can reach the regulation requirement through less adjustment, and has protected equipment.
Claims (2)
1, signal source amplitude initial value establishing method in a kind of electromagnetic compatibility sensitivity test is characterized in that comprising the steps:
Step 1: for first test frequency, the signalization source amplitude initial value is V (f
10);
Step 2: at V (f
10) the basis on carry out the amplitude adjustment according to existing amplitude adjustment scheme, make the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
1), note signal source amplitude V (f this moment
11), the dBm of unit;
Step 3: the frequency f that signal source frequency is transferred to second test frequency
2, the pre-depreciation B that signal calculated source amplitude is adjusted; Pre-depreciation B=k α=k (f
2-f
1)/f
1, the dB of unit; Wherein α represents the stepping ratio, α=(f
2-f
1)/f
1K represents scale-up factor, and the typical span of k is 100～2000;
Step 4: calculate the ultimate value of current frequency standard code and on the difference C of ultimate value of a frequency standard code, calculate and be provided with the signal source amplitude initial value V (f of current frequency in view of the above
20); C=V
Lim(f
2)-V
Lim(f
1), the dB of unit, wherein: V
Lim(f
1) be illustrated in the ultimate value of first test frequency standard code, V
Lim(f
2) be illustrated in the ultimate value of second test frequency standard code; The signal source amplitude initial value of current frequency is set to V (f
20)=V (f
11)+C-B carries out the amplitude adjustment according to existing amplitude adjustment scheme, makes the measured value of surveillance equipment reach the ultimate value V of standard code
Lim(f
2);
Step 5: the frequency of next frequency to be measured is made as f
2, the frequency of current frequency is made as f
1, repeating step three finishes up to all frequency tests to be measured to step 5, finally finishes the susceptibility test.
2, according to signal source amplitude initial value establishing method in the described a kind of electromagnetic compatibility sensitivity test of claim 1, it is characterized in that: the measured value of surveillance equipment and the ultimate value of standard code are any one in electric field intensity, magnetic induction density or the strength of current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102228746A CN101377534B (en) | 2008-09-24 | 2008-09-24 | Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102228746A CN101377534B (en) | 2008-09-24 | 2008-09-24 | Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test |
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| Publication Number | Publication Date |
|---|---|
| CN101377534A true CN101377534A (en) | 2009-03-04 |
| CN101377534B CN101377534B (en) | 2011-05-04 |
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ID=40421168
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102228746A Expired - Fee Related CN101377534B (en) | 2008-09-24 | 2008-09-24 | Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823135A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Method for adjusting frequency point range in multifrequency quick sensitivity test |
| CN106714196A (en) * | 2016-12-26 | 2017-05-24 | 全球能源互联网研究院 | Method and device for deploying wireless communication devices |
| 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 |
-
2008
- 2008-09-24 CN CN2008102228746A patent/CN101377534B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823135A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Method for adjusting frequency point range in multifrequency quick sensitivity 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 |
| CN106714196A (en) * | 2016-12-26 | 2017-05-24 | 全球能源互联网研究院 | Method and device for deploying wireless communication devices |
| 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 |
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