Thermocouple connections
Connections for thermocouples are shown below. Thermocouples are color coded to identify the
positive (+) and negative (–) leads (see the table). Note that the negative (–) lead for U.S. type T/Cs is
red.
When using the Series 3700A analog backplane connector, use a simulated reference junction for
thermocouple temperature measurements. An ice bath, as shown below, serves as an excellent cold
junction because it is relatively easy to hold the temperature to 0 °C. Notice that copper wires are
used to connect the thermocouple to the Series 3700A input.
Figure 53: Simulated reference junction
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