Signal sources can be grounded or floating.
信号源可接地或是未接地。
The general guideline for deciding which measurement system to pick is to measure grounded signal sources with a differential or NRSE system, and floating sources with an RSE system.
常用的指导方案确定测量系统选用接地信号源的微分或NRSE测量系统，以及未接地信号源的RSE测量系统。
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