signal drift in DAQ

[labmaster]

Using a microphone, I acquired the sound signal in DAQ(USB-6229, BNC type) in differential mode.

So far, there was no problem and I can find the correct signal.

After changing the battery of microphone, I found the drift of the sound signal.

Attachment shows the drift during the sound recording.

The drift and wrong offset voltage was not apeared in oscilloscope.

USB-6229/BNC type have a signal grounding switch, FS and GS.

But they don't affect the correction.

Would you please recommend me how to resolve my problem?

메시지가 09-08-2008 10:24 AM

에 labmaster에 의해 편집되었음

[labmaster]

I got to know my question was boring to you.

I found the solution. thanks to NI forum.

[Chris_D]

Hey labmaster,

I am glad you found the solution to your problem. Do you mind posting your solution so that if some other member of the community runs into the same problem and comes across this post they will know how you solved it? Thanks!