How correctly using USB 6251 to measure DC voltage

Hi all
I have encounter a problem like in the topic http://forums.ni.com/ni/board/message?board.id=170&message.id=404676&query.id=250408.
I'm sorry for repeating of topic but I've read all of your advices and have not yet resolved problem.
My task very simply: I use USB 6251, differential mode to measure voltage of battery Energizer 1.5V. But result shows >10V ??? Mean.vi shows bigger 4V (see the attached picture)
I don't understand what happed with my task?
Please help me!
Thank so much!
MC
Solved!
Go to Solution.
Attachments:
Acq gragph voltage.JPG ‏22 KB
result of measurement.JPG ‏50 KB

Thank Flaugher
I did not connect bias resistors. But now I do another way: connect possitive pole of battery to the AI0 and other to the AI GRD, choose input configuration "RSE" and get good results.
Attachments:
good results.JPG ‏23 KB

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On Feb 5, 7:10 am, peteryoung <[email protected]> wrote:
> Hi,
>  
> I wish to acquire a small voltage signal (0-20mV) using USB-9211.  I know that this device is designed for use with thermocouples, but I have been informed that it can also be used for measurement of small voltage signals (24 bit resolution over +/- 80mV range).
>  
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>  
> Can anybody confirm what the source of this voltage is, and advise what is the best way to acquire my signal through LabView?
>  
> I have already raised this query with the helpdesk (ref #613180) but have not yet had a definitive answer.
>  
> Many thanks
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How correctly using USB 6251 to measure DC voltage

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