Intab PC-Logger 3100i How To Use Manual page 20

6.3.1 Thermocouples
Thermocouples can be connected in two ways (see fig. below). Which one you
choose will depend on your particular application. As a general rule it would
appear to be more practical to connect the negative input to ground by setting
the switch in the single-ended position. Never leave any transducers without
some type of connection to ground.
The two methods can be combined but you have to make sure that your
ground leads don't carry any current or connect to the same point from two
directions. Ground leads that carry current will, at best, ruin your
measurements. At worst it will burn out your wiring.
Avoid these problems by using a one-point grounding scheme.
1) T/C "hot" junction in contact with conducting object.
2) T/C "hot" junction isolated from measured object.
20
+
-
+
-
DIFF GND
2
1
+
-
+
-
DIFF GND
2
1
INTAB Interface-Teknik AB
Connect object to signal
GND
Connect your T/C:s
Place switch in position
"DIFF"
Do NOT connect object
to signal GND
Connect your T/C:s
Place switch in position
"GND" making them
single ended