Jump to content

As of July 17, 2015, the LabJack forums here at forums.labjack.com are shut down. New registrations, topics, and replies are disabled. All forums are in a read-only state for archive purposes.

Please visit our current forums at labjack.com/forums to view and make new posts. To post on the current forums, use your labjack.com login account. Your old LabJack forums login credentials have been retired. There are no longer separate logins for labjack.com and LabJack forums.


Negative voltage on disconnected AINs

  • Please log in to reply
1 reply to this topic

#1 Peter S

Peter S
  • Members
  • 5 posts

Posted 18 June 2015 - 02:38 AM

Hi. I connected a U6 to a new PC and notice that I am getting negative voltage readings despite no channels being connected. The voltage reading increases with channel number by about 1.1 volt. If I short circuit between GND and any AIN I get a reading of 0. I have used this device several times before, and seem to remember that in a disconnected state the channels read approximately 0 volts. Should I be concerned or just carry on?




Attached Thumbnails

  • 2015-06-18 11.22.37.jpg

#2 LabJack Support

LabJack Support
  • Admin
  • 8677 posts

Posted 18 June 2015 - 11:51 AM

No reason to be concerned.  Readings from floating channels are tough to predict and pretty much meaningless:



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users