User`s manual

4.2 WIRING CONFIGURATIONS
Combining all the grounding and input type possibilities provides us with the following potential connection
configurations. The combinations along with our recommendations on usage are shown in the chart below.
Ground Category Input Configuration
Our view
RecommendedDifferential Inputs
Already Isolated
Grounds
AcceptableSingle-ended InputsAlready Isolated Grounds
Unacceptable without
adding Isolation
Differential Inputs
Common Mode
Voltage > +/-10V
Unacceptable without
adding Isolation
Single-Ended Inputs
Common Mode
Voltage > +/- 10V
RecommendedDifferential Inputs
Common Mode
Voltage < +/-10V
Not RecommendedSingle-Ended Inputs
Common Mode
Voltage < +/-10V
AcceptableDifferential InputsCommon Ground
RecommendedSingle-Ended InputsCommon Ground
The following sections depict recommended input wiring schemes for each of the 8 possible input
configuration/grounding combinations.
4.2.1 Common Ground / Single-Ended Inputs
Single-ended is the recommended configuration for common ground connections. However, if some of your
inputs are common ground and some are not, we recommend you use the differential mode. There is no
performance penalty (other than loss of channels) for using a differential input to measure a common
ground signal source. However, the reverse is not true. The diagram below shows a recommended connec-
tion diagram for a common ground / single-ended input system
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