Isolated Grounds / Single-Ended Inputs; Isolated Grounds / Differential Inputs - Omega Engineering PCI-DAS1001 User Manual

4.2.6 Isolated Grounds / Single-Ended Inputs

Single-ended inputs can be used to monitor isolated inputs, though the use of the differential mode will increase your
system's noise immunity. The diagram below shows the recommended connections is this configuration.

4.2.7 Isolated Grounds / Differential Inputs

Optimum performance with isolated signal sources is assured with the use of the differential input setting. The diagram
below shows the recommend connections is this configuration.
Isolatio n
B arrie r


G N D
1 0 K
W hen the voltage difference
betw een signal source and
A /D board gro und is large
enough so the A /D board's
com m on m ode ran ge is
exceeded, isolated sig nal
conditioning m ust be added.
S ystem w ith a La rge C om m on M ode Voltag e,
C onne cte d to a D ifferential Inp ut


I/O
C o nn ector
Iso lated S ignal S ource
C onne cte d to a S ingle-E nded Input
C H H igh
+
Inp ut
A m p
C H L ow -
LL G N D
I/O
A /D B oard
C o nn e cto r
1 0K is a reco m m e nd e d v a lu e. You m ay sh ort LL G N D to C H L ow
in ste ad , b ut th is w ill re du c e y o ur sy ste m 's n oise im m u nity.
CH IN
+
Inp ut
A m p
LL GND -
A /D B o ard
12
To A /D
To A /D