Measurement Computing PCM-DAS16D/12 - Manual (Page 19)

4.2WIRING CONFIGURATIONS
Combining all the grounding and input type possibilities provides us with the follow-
ing potential connection configurations. The combinations along with our recommen-
dations on usage are shown in the chart below.
Recommended Differential Inputs
Already Isolated
Grounds
Acceptable Single-ended Inputs
Already Isolated
Grounds
Unacceptable without
adding Isolation
Differential Inputs
Common Mode
Voltage > +/-10V
Unacceptable without
adding Isolation
Single-Ended Inputs
Common Mode
Voltage > +/- 10V
Recommended Differential Inputs
Common Mode
Voltage < +/-10V
Not Recommended Single-Ended Inputs
Common Mode
Voltage < +/-10V
Acceptable Differential Inputs Common Ground
Recommended Single-Ended Inputs Common Ground
OUR VIEW
INPUT
CONFIGURATION
GROUND
CATEGORY
The following sections depicts 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 recom-
mend 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.
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