摘要
比较了两款不同电源产品在非电磁屏蔽环境和电磁屏蔽环境下的电源端传导骚扰测试结果。结果表明,在3 MHz以下部分,两种环境下的测试结果是一致的,但在3 MHz以上部分误差较大。这说明电源端传导骚扰测试的高频部分受环境影响较大,如果需要得到准确的测量结果,测量需要在电磁屏蔽环境中进行。
The test results of two different power supply products from an informal test environment without shielding room and two different test environments with accreditation by CNAS are illustrated.The results show that informal test results are consistent with the results from accredited test laboratories below 3 MHz, but the difference is bigger above 3 MHz.The test results also reveal the environmental noise has greater influence on the result of continuous conductive emission of the power supply port in the high frequency range, which means the accurate test result above 3 MHz has to be obtained in the electromagnetic shielding room.
