FCC認證中電池供電的無線設(shè)備是否要做傳導騷擾

　　在實際工作中經(jīng)常會碰到客戶容易疑惑的實際問題。如用戶的無線產(chǎn)品是用電池供電的，在做FCC認證測試時是否需要做電磁兼容的傳導騷擾測試?就此問題我們簡要分析和回復如下。

　　依據(jù)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.

　　從標準中可看出，如果產(chǎn)品是只用電池供電，是不需要做AC端傳導騷擾的，但如果能用電池供電，同時也可以由AC轉(zhuǎn)換成DC給產(chǎn)品供電，如果供電的時候，樣品可以工作，就需要測傳導騷擾，不能工作的話，不需要測傳導騷擾。例如有些產(chǎn)品是通過USB插到電腦上供電的，供電的同時產(chǎn)品能正常工作，需要做電腦端的AC傳導騷擾測試。

　　下圖是判斷是否做傳導騷擾的流程圖：