Method for adjusting output amplitude of signal source in electromagnetic compatibility sensitivity test
A technology for signal adjustment and electromagnetic compatibility, applied in the parts of electrical measuring instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of inaccurate test measurement data, low test efficiency, etc. effect of time
Inactive Publication Date: 2009-01-14
BEIHANG UNIV
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Problems solved by technology
[0006] 1. If the output amplitude measured by the monitoring device based on the initial value of the signal source is small, since the set step value is fixed, it may take multiple cycles before the measured value of the monitoring device can reach the standard limit value, resulting in Inefficiency of testing
[0007] 2. If the output amplitude measured by the monitoring equipment according to the initial value of the signal source is close to the standard limit value, the initial value of the signal source may exceed the standard limit value in the next step, making the test measurement data inaccurate
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[0038] Assuming that the initial value of the signal source is S=-60dBm (47dBuV), the corresponding electric field strength measurement amplitude E can be obtained through the measurement of the monitoring equipment 0 =120dBuV / m, standard limit value E 1 166dBuV / m, measured amplitude E 0 and the standard limit value E 1 The difference ΔE is 46dB, assuming a dwell time of 2s is required for each cycle.
[0039] Set the proportional coefficient α to 20%, and the threshold X to ±1dB. The specific adjustment steps are shown in Table 1, as follows:
[0040] Table 1 The present invention carries out the process of amplitude adjustment
[0041] step
[0042] It can be obtained from Table 1 that when the amplitude reaches the second step according to the step value, |E 0 -E' 0 |
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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 [0001] The invention belongs to the field of electromagnetic compatibility sensitivity test, in particular to a method for adjusting the output amplitude of a signal source in the electromagnetic compatibility sensitivity test. Background technique [0002] According to GJB151A-97 "Requirements for Electromagnetic Emission and Susceptibility of Military Equipment and Subsystems", electromagnetic compatibility testing includes two parts: electromagnetic interference (EMI) testing and electromagnetic susceptibility (EMS) testing, and electromagnetic susceptibility testing includes conduction sensitivity. Accuracy and radiation susceptibility testing. The basic principle of the sensitivity test is that the interference generating equipment produces a certain level of electromagnetic interference, such as figure 1 As shown, in the radiation sensitivity test, a radiation antenna is used to generate an external radiation electric field or magnetic field. The outpu...
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IPC IPC(8): G01R31/00G01R1/28
Inventor 谢树果戴飞邵康苏东林孔蓉张大为
Owner BEIHANG UNIV
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