CN101520479A - Method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed - Google Patents
Method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed Download PDFInfo
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- CN101520479A CN101520479A CN200910080989A CN200910080989A CN101520479A CN 101520479 A CN101520479 A CN 101520479A CN 200910080989 A CN200910080989 A CN 200910080989A CN 200910080989 A CN200910080989 A CN 200910080989A CN 101520479 A CN101520479 A CN 101520479A
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Abstract
The invention discloses a method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed, which comprises the steps: firstly, a testing frequency from 10 kHz to 18 GHz is dispersed according to a frequency step length which conforms to a GJB sensitivity testing requirement to ensure a testing frequency point; the whole testing frequency is grouped from low to high beginning from a starting frequency, and each group has N frequency points; then, an arbitrary waveform generator is controlled to output N frequencies once and switch the frequencies according to group steps; the frequency groups are scanned, if a tested device is sensitive, the frequency group is scanned point to point to determine the sensitive frequency point, and the sensitivity threshold level of the frequency point is determined according to a military standard single-point testing method; the frequencies are switched according to a group stepping mode, each group of frequencies integrally step according to the N delta f step length equivalently, and the next group of multifrequency signals is output until a whole frequency band is scanned completely. The method can synchronously test a plurality of frequently points by scanning once, automatically realize the step scan according to the groups, greatly increase the testing efficiency of the sensitivity test and can quickly diagnose the failures of the sensitive points.
Description
Technical field
The present invention relates to the electromagnetic radiation field, is a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed specifically.
Background technology
Any electric, electronic equipment and subsystem all inevitably to power line feedback electromagnetic energy, also reveal and distribute electromagnetic energy simultaneously from casing, interconnection line, feeder etc. to the space when its work.The electromagnetic environment that these are had a mind to and electromagnetic energy has constituted the some time somewhere unintentionally, complicated, abominable electromagnetic environment is the potential interference source of this place equipment.Device level Electromagnetic Launching and susceptibility measurement are the means of assessment apparatus EMC level, also are the foundations of taking the EMI measure.Emc testing is concluded and can be classified as 4 classes: radiation emission test, radiosensitivity test, conduction transmission test, conducted susceptibility test.
Often there are a lot of power leads and signal wire in electronic equipment or system, and these cables have constituted the passage of system capacity and information transmission on the one hand, have also formed the route of transmission of Conduction Interference on the other hand.Therefore, need to carry out to all interconnection lines of system the conducted susceptibility test, determine to pass through the interfering signal of hole coupling to the impact of system.Conducted susceptibility is meant and is subjected to examination equipment to being coupled to the ability to bear of the undesired signal on input power cord, interconnection line and the casing.
The conduction sensitivity measurement common practices is in the frequency range of regulation tested equipment to be carried out step-by-step movement scanning.For integrality and the accuracy that guarantees to test, the sweep speed of signal source and the maximum of frequency step generally have regulation, and this speed and step-length are determined by signal source tuned frequency and multiplication factor.And step-by-step movement scanning requires at least resident 1s of the test of each frequency, and actual test is generally all more than 2 seconds.To some tested equipment, for reliable the observation responds, should reduce in case of necessity sweep speed and reduce step-length.For some main equipment and system, complex structure, with frequently, consumer is numerous, the intraconnection cable can reach thousands of right, and total length reaches hundreds of rice even thousands of rice, and obviously, traditional pointwise step-by-step movement scan method is consuming time oversize, and efficient is not high.
Summary of the invention
The present invention need to test the problem that causes efficient not high to each frequency one by one mainly for traditional pointwise step-by-step movement scanning in the electromagnetic compatibility sensitivity test, a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed has been proposed, this method can be injected into the test signal of a plurality of frequencies in the tested cable simultaneously, guaranteeing under the prerequisite of measuring accuracy, improving test speed.
Mainly finish by following steps:
The first step: by the frequency step △ f that meets GJB151A-97 susceptibility test request the test frequency of 10kHz～18GHz is dispersed, determine all test frequency points.
Second step: from initial frequency f0, the user specifies all frequencies is divided into n group, wherein every group of N frequency points, evenly divide into groups from low to high to whole test frequency scope in n 〉=2, namely every group of frequency points that comprises all is N, frequency number N is more big, and test speed improves more fast.
In the above-mentioned grouping process, it is upper limiting frequency that last frequency of last class frequency not necessarily requires, and under the prerequisite that guarantees the coverage test upper frequency limit, the frequency points of selecting suitable N value to make last group exceed the upper limit is lacked as far as possible, is generally less than N.
The 3rd step: the control AWG is once exported N frequency, and by group step-by-step movement switching frequency.
The 4th step: the group of frequencies in the 3rd step is scanned, the time of staying is more than 1 second, if tested equipment has sensitivity, then this group of frequencies that comprises sensitive spot is carried out point by point scanning, determine to occur responsive concrete frequency, determine the susceptibility threshold level at this frequency place according to army's mark single-spot testing method; If tested equipment is insensitive, then carried out for the 5th step.
The 5th step: by group step-by-step movement switching frequency, be equivalent to every class frequency by the whole stepping of N △ f step-length, export next group multiple-frequency signal, repeated for the 4th step.
The 6th step: judge whether been scanned of whole frequency ranges: complete if scanning does not have, repeat～the five step of the 3rd step, successively automatically by the group step-scan; If been scanned, then off-test.
The invention has the advantages that:
(1) but a plurality of frequencies of the inventive method single pass synchronism detection and automatically realize greatly having improved the testing efficiency of sensitivity testing by the scanning of group step-by-step movement;
(2) the present invention have the multifrequency selectivity, by group step-by-step movement and quick diagnosis, can quick diagnosis sensitive spot fault.
Description of drawings
Fig. 1 is a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed process flow diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention is a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed, whole frequency range is divided into groups, the control AWG (Arbitrary Waveform Generator) is exported first class frequency point for the first time, exports second class frequency point for the second time, successively by the scanning of group step-by-step system.
As shown in Figure 1, mainly finish by following steps:
The first step: by the frequency step △ f that meets GJB151A-97 susceptibility test request the test frequency of 10kHz～18GHz is dispersed, determine all test frequency points.
Second step: from initial frequency f0, the user specifies all frequencies is divided into n group, wherein every group of N frequency points, evenly divide into groups from low to high to whole test frequency scope in n 〉=2, namely every group of frequency points that comprises all is N, frequency number N is more big, and test speed improves more fast.
It is upper limiting frequency that last frequency of last class frequency not necessarily requires, and under the prerequisite that guarantees the coverage test upper frequency limit, the frequency points of selecting suitable N value to make last group exceed the upper limit is lacked as far as possible.For example: 103 frequencies are divided into 10 groups, and every group of N frequency points equals 10, and remaining 3 frequencies can give up.
The 3rd step: the control AWG is once exported N frequency, and by group step-by-step movement switching frequency.
Control every class frequency by the whole stepping of N △ f step-length, that is to say, scan simultaneously N the frequency that begins from f0 for the first time: f0+ △ f～f0+N △ f.
The 4th step: the 3rd step medium frequency group is scanned, the time of staying is more than 1 second, if tested equipment has sensitivity, then this group of frequencies that comprises sensitive spot is carried out point by point scanning, determine to occur responsive concrete frequency, determine the susceptibility threshold level at this frequency place according to army's mark single-spot testing method;
If tested equipment is insensitive, then carried out for the 5th step;
The 5th step: by group step-by-step movement switching frequency, be equivalent to every class frequency, export N frequency: f0+ (N+1) △ f～f0+2N △ f of next group multiple-frequency signal, repeated for the 4th step by the whole stepping of N △ f step-length.
The 6th step: judge whether been scanned of whole frequency ranges: if scanning does not finish, repeat～the five step of the 3rd step, successively automatically by the group step-scan; If been scanned, the whole band scan of then whole frequency range finish off-test.
Use the each scan N of a method provided by the invention frequency, being equivalent to stepping length has increased N doubly, and whole test period then can shorten to original 1/N.Consider the difficulty that multi-frequency signal generator is realized, can accomplish at present in actual applications to improve 3～20 times than conventional test methodologies.
Embodiment:
Conducted susceptibility test for carrying out in 10kHz～30MHz frequency range according to the scanning of the susceptibility test frequency among the GJB152A-97, needs 110 Frequency points, if be divided into five groups, then sets up susceptibility frequency sweeping table (Hz of unit) as shown in table 1:
Frequency sweeping table behind the table 1 minutes five groups
| First group | Second group | The 3rd group | The 4th group | The 5th group |
| 10100 | 12571.6302 | 15648.1075 | 19477.4475 | 24243.8879 |
| 10201 | 12697.3465 | 15804.5885 | 19672.222 | 24486.3267 |
| 10303.01 | 12824.32 | 15962.6344 | 19868.9442 | 24731.19 |
| 10406.0401 | 12952.5631 | 16122.2608 | 20067.6337 | 24978.5019 |
| 10510.1005 | 13082.0888 | 16283.4834 | 20268.31 | 25228.2869 |
| 10615.2015 | 13212.9097 | 16446.3182 | 20470.9931 | 25480.5698 |
| 10721.3535 | 13345.0388 | 16610.7814 | 20675.7031 | 25735.3755 |
| 10828.5671 | 13478.4892 | 16776.8892 | 20882.4601 | 25992.7293 |
| 10936.8527 | 13613.274 | 16944.6581 | 21091.2847 | 26252.6565 |
| 11046.2213 | 13749.4068 | 17114.1047 | 21302.1975 | 26515.1831 |
| 11156.6835 | 13886.9009 | 17285.2457 | 21515.2195 | 26780.3349 |
| 11268.2503 | 14025.7699 | 17458.0982 | 21730.3717 | 27048.1383 |
| 11380.9328 | 14166.0276 | 17632.6792 | 21947.6754 | 27318.6197 |
| 11494.7421 | 14307.6878 | 17809.006 | 22167.1522 | 27591.8059 |
| 11609.6896 | 14450.7647 | 17987.096 | 22388.8237 | 27867.7239 |
| 11725.7864 | 14595.2724 | 18166.967 | 22612.7119 | 28146.4012 |
| 11843.0443 | 14741.2251 | 18348.6367 | 22838.839 | 28427.8652 |
| 11961.4748 | 14888.6373 | 18532.123 | 23067.2274 | 28712.1438 |
| 12081.0895 | 15037.5237 | 18717.4443 | 23297.8997 | 28999.2653 |
| 12201.9004 | 15187.8989 | 18904.6187 | 23530.8787 | 29289.2579 |
| 12323.9194 | 15339.7779 | 19093.6649 | 23766.1875 | 29582.1505 |
| 12447.1586 | 15493.1757 | 19284.6015 | 24003.8494 | 29877.972 |
If the user specifies and will be divided into six groups, 18 Frequency points of every group of needs 110/6 ≈ then, then set up susceptibility frequency scanning table as shown in table 2:
Frequency sweeping table behind the table 2 minutes six groups
| First group | Second group | The 3rd group | The 4th group | The 5th group | The 6th group |
| 10100 | 12081.0895 | 14450.7647 | 17285.2457 | 20675.7031 | 24731.19 |
| 10201 | 12201.9004 | 14595.2724 | 17458.0982 | 20882.4601 | 24978.5019 |
| 10303.01 | 12323.9194 | 14741.2251 | 17632.6792 | 21091.2847 | 25228.2869 |
| 10406.0401 | 12447.1586 | 14888.6373 | 17809.006 | 21302.1975 | 25480.5698 |
| 10510.1005 | 12571.6302 | 15037.5237 | 17987.096 | 21515.2195 | 25735.3755 |
| 10615.2015 | 12697.3465 | 15187.8989 | 18166.967 | 21730.3717 | 25992.7293 |
| 10721.3535 | 12824.32 | 15339.7779 | 18348.6367 | 21947.6754 | 26252.6565 |
| 10828.5671 | 12952.5631 | 15493.1757 | 18532.123 | 22167.1522 | 26515.1831 |
| 10936.8527 | 13082.0888 | 15648.1075 | 18717.4443 | 22388.8237 | 26780.3349 |
| 11046.2213 | 13212.9097 | 15804.5885 | 18904.6187 | 22612.7119 | 27048.1383 |
| 11156.6835 | 13345.0388 | 15962.6344 | 19093.6649 | 22838.839 | 27318.6197 |
| 11268.2503 | 13478.4892 | 16122.2608 | 19284.6015 | 23067.2274 | 27591.8059 |
| 11380.9328 | 13613.274 | 16283.4834 | 19477.4475 | 23297.8997 | 27867.7239 |
| 11494.7421 | 13749.4068 | 16446.3182 | 19672.222 | 23530.8787 | 28146.4012 |
| 11609.6896 | 13886.9009 | 16610.7814 | 19868.9442 | 23766.1875 | 28427.8652 |
| 11725.7864 | 14025.7699 | 16776.8892 | 20067.6337 | 24003.8494 | 28712.1438 |
| 11843.0443 | 14166.0276 | 16944.6581 | 20268.31 | 24243.8879 | 28999.2653 |
| 11961.4748 | 14307.6878 | 17114.1047 | 20470.9931 | 24486.3267 | 29289.2579 |
Two some 29582.1505Hz and the 29877.972Hz of back give up automatically.
Selecting to be divided into 5 groups in this embodiment tests.
It is responsive to suppose to only have frequency 13613.274Hz and 21947.6754Hz place to take place, first group of 22 frequency tested according to step 2 and step 3, owing to do not take place responsive, then carried out for the 5th step and carry out the test of second group of 22 frequency, in the process of the test of carrying out step 2 and step 3, because sensitivity takes place, then all frequencies to second group of 22 frequency carry out the sensitivity test one by one, find the sensitive frequency of 13613.274Hz, determine the responsive threshold level at this frequency place.
22 frequencies of this group are all tested complete rear same method the 3rd group～the 5th group are tested, and record sensitive frequency and responsive threshold level.
Needed all frequencies are tested just one by one in the past and can find sensitivity, and the present invention is divided into some groups by said method with frequency, each group frequency integral body is tested, only need a spot of test can find sensitivity, thereby improved the testing efficiency of conducted susceptibility test.
Claims (2)
1, a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed is characterized in that: finish by following steps:
The first step: by the frequency step Δ f that meets GJB151A-97 susceptibility test request the test frequency of 10kHz～18GHz is dispersed, determine all test frequency points;
Second step: from initial frequency f0, the user specifies all frequencies is divided into the n group, every group of N frequency points wherein, and evenly divide into groups from low to high to whole test frequency scope in n 〉=2;
The 3rd step: the control AWG is once exported N frequency, and by group step-by-step movement switching frequency;
The 4th step: the group of frequencies in the 3rd step is scanned, the time of staying is more than 1 second, if tested equipment has sensitivity, then this group of frequencies that comprises sensitive spot is carried out point by point scanning, determine to occur responsive concrete frequency, determine the susceptibility threshold level at this frequency place according to army's mark single-spot testing method; If tested equipment is insensitive, then carried out for the 5th step;
The 5th step: by group step-by-step movement switching frequency, be equivalent to every class frequency by the whole stepping of N Δ f step-length, export next group multiple-frequency signal and scan, repeated for the 4th step;
The 6th step: judge whether been scanned of whole frequency ranges: complete if scanning does not have, repeat～the five step of the 3rd step, successively automatically by the group step-scan; If been scanned, then off-test.
2, a kind of method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed according to claim 1, it is characterized in that: in the grouping in second step, under the prerequisite that guarantees the coverage test upper frequency limit, the frequency points that the N value of selection makes last group exceed the upper limit minimizes.
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| CN102175928A (en) * | 2011-01-24 | 2011-09-07 | 北京航空航天大学 | Method for selecting amplitude-frequency curve characteristic points in electromagnetic compatibility test |
| CN103823136A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Multifrequency quick sensitivity test frequency point combination method based on power balance |
| 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 |
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| CN102175928A (en) * | 2011-01-24 | 2011-09-07 | 北京航空航天大学 | Method for selecting amplitude-frequency curve characteristic points in electromagnetic compatibility test |
| CN103823136A (en) * | 2014-02-24 | 2014-05-28 | 北京航空航天大学 | Multifrequency quick sensitivity test frequency point combination method based on power balance |
| 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 |
| CN103823136B (en) * | 2014-02-24 | 2016-05-11 | 北京航空航天大学 | A kind of multifrequency high-speed sensibility test frequency combined method based on power equalization |
| CN107192902A (en) * | 2017-05-19 | 2017-09-22 | 北京航空航天大学 | A kind of cable conducted susceptibility waving map method using many Gaussian pulses |
| CN107192902B (en) * | 2017-05-19 | 2019-12-06 | 北京航空航天大学 | Cable conduction sensitivity time domain testing method using multiple Gaussian pulses |
| CN109001554A (en) * | 2018-05-24 | 2018-12-14 | 上海市计量测试技术研究院 | Immunity experiment multifrequency signal generator |
| CN113866517A (en) * | 2021-09-30 | 2021-12-31 | 北京航空航天大学 | Open field normalized site attenuation automatic test method and device |
| CN114325207A (en) * | 2022-03-14 | 2022-04-12 | 北京航空航天大学 | Intelligent driving automobile conduction sensitivity test platform and test method |
| CN114839467A (en) * | 2022-05-27 | 2022-08-02 | 苏州浪潮智能科技有限公司 | Testing method and device for efficient positioning server to conduct cable exceeding standard |
| CN114839467B (en) * | 2022-05-27 | 2023-12-22 | 苏州浪潮智能科技有限公司 | Test method and device for high-efficiency positioning server conduction super-mark cable |
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