difference between input and output values

[hema]

I am using NI DAQ 6024E and SCB 68.
I have shorted one anlog output and input channel
in the SCB 68 board itself.(differential connection). that is whatever ouput voltage
i am giving at o/p channel 22 and 55 should come at i/p
channel 68 and 34. But when i read the values in my VI,
the input voltage is higher than o/p. why is the difference.
I used default buffer size 1000 and AI Single scan and AO Single Update.

[RIO-Todd]

There doesn't seem to be a problem with your pin connections.

The SCB-68 has a temperature sensor that can be used as cold-junction compensation for thermocouple measurements. If the temperature sensor is enabled, it will use channel 0 of the DAQ device.

Since you are connecting to channel 0 of the 6024E, I would make sure you have the temperature sensor of the SCB-68 disabled. You can disable the temperature sensor by using the switched of the SCB-68. The User Manual of the SCB-68 is linked below and provides the information on how to disable the temperature sensor (page 2-4).

SCB-68 68-Pin Shielded Connector Block User Manual
http://digital.ni.com/manuals.nsf/webAdvsearch/74C86ADEF0E4813F86256C84007CB3AB?OpenDocument&vid=niwc&node=132100_US

I hope t
his helps.

Regards,

Todd D.