Intab PC-Logger 3100i How To Use Manual page 22

6.3.3 Voltages
Voltages are measured by connecting in one of the two indicated ways (see
figure below). The two methods can be combined if care is taken to avoid
ground loops.
1) Signals with Common ground reference.
2) "Floating" signals.
22
DIFF
+
-
+
-
DIFF GND
2
1
INTAB Interface-Teknik AB
Connect "3100i" signal
GND to system ground.
+
Connect sensors
-
+
-
Place switch in position
GND
"DIFF"
2
1
Leave signal GND
unconnected.
Connect your sensors
Refer signals to GND by
placing switch in position
"GND"