采集卡杂波来源

[lsstc]

大家好！我是使用的是pci-6251进行信号采集，但是很多的杂波，而且在输入未接入信号源时都有杂波显示，是不是采集卡本身会产生杂波信号呢？可以通过哪些途径进行滤波呢？谢谢！！

[ian_fung]

You don't acquire channel(s) that not connected to any signal source, don't you?

[lsstc]

是的，在我没有将通道连接到信号源时，在labview中都有信号信号显示，如果将连接两个通道的连线连在一起则信号正好反相抵消，请问这是什么原因呢？是不是受外界的信号干扰呢？

[ian_fung]

So, does it matters if there is floating signal (i.e. noise) in channels that are not connected to any signal source? I suppose that you are not acquiring channels without signal source, right?

And, what is the problem that you are facing? 

[lsstc]

Thank you for your reply , yes ,it  is also affected by the noise if they are not nonnected ot any sigal source, can you tell me how to do with it ?than you!

[ian_fung]

Will some proper grounding help?