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Wiring Signals
45
Connecting Thermocouple Inputs
The DT9871U, DT9871, and DT9874 instruments contain thermocouple jacks for connecting
thermocouple inputs.
Note: On the standard DT9874 instrument, channels 0 to 15 correspond to the thermocouple
input channels.
Internally, these signals are connected in differential mode. You can mix and match the
following thermocouple types across channels: B, E, J, K, N, R, S, and/or T.
Each thermocouple input jack is polarized and accepts a mating plug in the appropriate
orientation.
Table 1 lists the color designations for the + and – polarities of the supported
thermocouple types for both the ANSI (American) and IEC (International) standards.
For more information on thermocouple standards, refer to the following web site:
http://www.omega.com/thermocouples.html.
Table 1: Thermocouple Color Designation Standards
Thermocouple
Standard
Thermocouple
Type
Wire Color Coding
+ Polarity
Wire Color Coding
– Polarity
ANSI Type J White Red
Type K Yellow Red
Type T Blue Red
Type E Violet Red
Type S Black Red
Type R Black Red
Type B Gray Red
Type N Orange Red
IEC Type J Black White
Type K Green White
Type T Brown White
Type E Violet White
Type S Orange White
Type R Orange White
Type B Gray White
Type N Pink White