Measurement Computing PCM-DAS16D/12 - Manual (Page 23)

4.2.7 Isolated Grounds / Differential Inputs
Optimum performance with isolated signal sources is assured with the use of the dif-
ferential input setting. The diagram below shows the recommend connections is this
configuration..
19
+
-
Input
Amp
To A/D
A/D Board I/O
Connector
LL GND
CH High
CH Low
+
-
Sign
al So
urce
and
A/D B
oard
A
lread
y Iso
lated
.
Already isolated signal source
and A/D board connected to
a differential input.
GND
These grounds are
electrically isolated.
10 K
10K is a recommended value. You may short LL GND to CH Low
instead, but this will reduce your system’s noise immunity.