The full LED front combination lamps are tested both in vehicle and as component alone in a 10-meter semi-anechoic chamber under a narrowband radiated electromagnetic interference. The results show that in a frequency range of 20-220MHz, LED illuminance reduces with the increase of electric field intensity, and the reduc-tion in illuminance in vehicle test is larger than that in component test. Different LED lamps have different lit fre-quencies and thresholds, and the lit thresholds in component test are higher than that in vehicle test. Based on test results, it is suggested that measures for the anti-interference of narrow-band radiation should be taken for automo-tive LED lamps to avoid false signals, and for narrowband radiated electromagnetic interference tests, vehicle test is preferable to component one.%在10m法暗室内,对汽车的全LED前组合灯进行了整车和部件在窄带辐射电磁干扰下的测试. 结果表明,在频率20~220MHz范围内,LED照度随场强增加而衰减,整车测试的照度衰减大于部件测试的照度衰减;不同车灯的激亮频率和阈值不同,部件测试的激亮阈值大于整车测试. 根据测试结果,建议对LED车灯采取窄带辐射抗干扰措施,以免引发错误信号,而对于LED车灯窄带辐射抗扰测试,采用整车测试比部件测试更合理.
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