FCC认证中电池供电的无线设备是否要做传导骚扰

　　在实际工作中经常会碰到客户容易疑惑的实际问题。如用户的无线产品是用电池供电的，在做FCC认证测试时是否需要做电磁兼容的传导骚扰测试?就此问题我们简要分析和回复如下。

　　依据FCC part 15.207c：

　　Measurements to demonstrate compliance with the conducted limits are not required for devices which only employ battery power for operation and which do not operate from the AC power lines, or contain provisions for operation while connected to the AC power lines. Devices that include, or make provisions for, the use of battery chargers which permit operating while charging, AC adapters or battery eliminators, or that connect to the AC power lines indirectly, obtaining their power through another device which is connected to the AC power lines, shall be tested to demonstrate compliance with the conducted limits.

　　从标准中可看出，如果产品是只用电池供电，是不需要做AC端传导骚扰的，但如果能用电池供电，同时也可以由AC转换成DC给产品供电，如果供电的时候，样品可以工作，就需要测传导骚扰，不能工作的话，不需要测传导骚扰。例如有些产品是通过USB插到电脑上供电的，供电的同时产品能正常工作，需要做电脑端的AC传导骚扰测试。

　　下图是判断是否做传导骚扰的流程图：