怎么使用34972A和34901A多路复用器进行电流测量

测量负载电流的唯一方法是尽可能靠近负载切断线路，并将引线连接到该点的电流通道。



     以下为原文

  The only way to measure the current at the load is to cut the line as close as possible to the load and attach the leads to the current channel at that point.

我做的完全一样。
我剥去电线并将引线连接到它们并连接到当前通道。
我仍然读取源值而不是加载值。



     以下为原文

  I did exactly the same. I stripped the wire and attached  the leads to them and connected to the current channels. I still read the source values rather than load values.

从你说明这一点的方式来看，你是不是很清楚，你完成了将引线切断到DUT并将34972A / 34901A插入路径中，但你必须这样做才能正确读取源电流。
34972A / 34901A将读取通过导体到34901A插入DUT路径的电流。
除非连接到该点，否则它不可能在任何其他点读取电流。
必须是DUT中的某个位置从您的连接点下降并且在DUT内的负载之前，对于某些源电流存在接地的寄生路径。
如果可能，隔离DUT内的负载并测量其电阻。
然后测量完整DUT的电阻。
如果存在接地寄生路径，则负载的电阻应大于整个DUT的电阻。



     以下为原文

  It's not clear from the way you state this whether or not, you completels cut the leads to the DUT and inserted the 34972A/34901A in the path, but you must have done that for it to read the source current correctly.  The 34972A/34901A will read the current that is going through the conductor at the point where the leads to the 34901A were inserted in to the path to the DUT.  It can't possibly read the current at any other point unless it is connected to that point.  It must be that somewhere in the DUT downstrean from your connection point and before the load within the DUT, there is a parasitic path to ground for some of the source current.  If possible, isolate the load within the DUT and measure its resistance.  Then measure the resistance of the complete DUT.  If there is a parasitic path to ground, the resistance of the load should be greater than the resistance of the complete DUT.