两个压力检测通道怎样求差好?

发表于 2013-8-14 12:59

两个通道共地。
用示波器探头的正负极分别接两个通道的正极，噪声振幅为1V。
分别用两个探头把两路压力信号接入示波器，然后相减，所得信号噪声振幅为0.2V。
都这样吗？为什么？
谢谢！

发表于 2013-8-16 14:44

用两个探头分别测量两通道，然后相减就行吧，很多示波器都支持这功能的

发表于 2013-8-17 12:18

本帖最后由 andyany 于 2013-8-17 12:20 编辑

mcudyd 发表于 2013-8-16 14:44
用两个探头分别测量两通道，然后相减就行吧，很多示波器都支持这功能的

I did before you said, and told at the 1st floor.
You are so funny.

发表于 2013-8-17 17:25

andyany 发表于 2013-8-17 12:18
I did before you said, and told at the 1st floor.
You are so funny.

Although you have known that it was ok why you asked it? I gave you confirmation and agreement but the other guys did not gave you any ideas, so you are funny too.

两个压力检测通道怎样求差好?

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