Why do I get an offset with analog input


Hello

Thanks for posting your question on the forum.  I suspect that there may be a problem with
the grounding.  I recommend looking through
Developer Zone article, field wiring and analog noise considerations
Signals
, which describes in detail how to properly ground a signal.

The important things to note are that you have a floating
the source signal (unrelated to the construction on the ground) or an earthing and the
setting input of your measurement (differential, referenced asymmetric,)
non-references asymmetric).  For
example, if you have a floating source and you try to measure the
signal in differential mode, you must add two resistances (between
10kOhms and 100kohms) to land correctly signal.  Resistance would HAVE + AI GND and
other resistors would connect I - of AI GND.

Post back with more details about your configuration of source and the input of the signal if you need more help.

Tags: NI Software

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