Sero reading when the equipment is off with NI6221

Hi,
I am acquiring few voltage signals using NI-6221 connected through SCB-68 connecting box. When there is no voltage in the test setup the acquiring data shows some values. Is there any way to make this incoming signal zero when the equipment is off? I appreciate a help very much.
Thanks,
amaka

Hi,
When the inputs are shorted the DAQ board read the zero value.
If I connect a DAG input to a voltage output of precious power supply, should the DAQ reading be the same as the set voltage. This is just to check what the wrong here is.
Thanks

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