Omega OMB-DAQBOARD-500 Series User Manual page 25

Differential (DIFF)
In installations where each Ground Referenced Source signal has a local ground [signals located remote from one
another] the Differential configuration must be used. Since the Differential configuration only responds to the
difference in a signal between its high and low voltages, any Common Mode Voltage will be cancelled out. In
addition, Differential configuration provides the best performance of the two configurations in an electrically noisy
environment.
The Differential configuration should be used when any of the following exist:
Each source has a local ground
Signal sources are remote from one another
Common Mode Voltage exists
Common Mode Noise exists
Signal sources are low-level (less than 1 V)
Signal source leads are longer that 12 feet
Differential for Grounded Signal Sources
The following figure is an example of a Differential Configuration for grounded signal sources.
DaqBoard/500 Series User's Manual
Differential Configuration for Grounded Sources
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Connections & Pinouts 2-9