Problem of shift of groud level in AI channel in Differential mode ?

Question

We are using PXI-6052E card ,
When checking Analog Input of the card in the Differential mode ,
The ground level shifts by about 1.11 Volt .
* When we applied +Ve 5 Volt from the Analog output channel 0 to the AI channel 0 it
gives us 6.11 Volt ( -5.0 +1.11 = 6.11 ) in average in MAX .
* When we applied -Ve 5 Volt from the Analog output channel 0 to the AI channel 0 it
gives us -3.88 Volt ( -5.0 + 1.11 = -3.88) in average in MAX .
* When we applied +Ve 3 Volt from the an external battery to the AI channel 0 it
gives us 4.38 Volt ( 3.00 + 1.11 = 4.38) in average in MAX .
* When we applied +Ve 3 Volt from the an external battery to the AI channel 0 with
the inputs reversed it gives us -1.89 Volt( -3.00 + 1.11 = -1.89) in average in MAX .
* When we applied 5 Volt(peak to peak) from the Analog output channel 0 to the AI
channel 0 it gives us 6.11 Volt ( -5.0 +1.11 = 6.11) average in MAX for +Ve peak
value and -3.88 Volt ( -5.0 + 1.11 = -3.88) in average in MAX for –Ve peak value .
It gives the same results for all 8 DI Analog channels .
What can be the possible solutions for our problem ?
Do the card need calibration or some other problem is there ?

Answer 1

Greetings,
I would first suggest that, if this device is in a system connected to the internet, you run the Online E Series Diagnostic. This utility will test the functionality of your board and perform a self-calibration. The link to this utility is available below:
http://ni.com/support/selftest/
Unless this calibration fixes the problem, I would create a phone support request at the following location to arrange the repair of your board:
http://sine.ni.com/apps/we/niae_asc.main
Best.
Spencer S.