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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 connection diagram for a common
ground / single-ended input system
4.2.2 Common Ground / Differential Inputs
The use of differential inputs to monitor a signal source with a common ground is an acceptable configuration,
though it requires more wiring and offers fewer channels than selecting a single-ended configuration. The diagram
below shows the recommended connections in this configuration.
13
+
-
Input
Amp
To A/D
A/D Board
I/O
Connector
LL GND
CH IN
Signal
Source with
Common Gnd
Optional wire
since signal source
and A/D board share
common ground
Signal source and A/D board
sharing common ground connected
to single-ended input.
+
-
Input
Amp
To A/D
A/D Board
I/O
Connector
LL GND
CH High
CH Low
Signal
Source with
Common Gnd
Optional wire
since signal source
and A/D board share
common ground
Required connection
of LL GND to CH Low
Signal source and A/D board
sharing common ground connected
to differential input.