isothermal block is an electrical insulator, but a good heat conductor. The additional thermocouples cre-
ated at J1 and J2 are now held at the same temperature by the isothermal block.
Once the temperature of the isothermal block is known, accurate temperature measurements can be
made. A temperature sensor is mounted to the isothermal block to measure its temperature.
Thermocouples are available in a variety of types. The type is specified by a single letter. The table below
shows the most commonly used thermocouple types and some key characteristics of each.
The thermocouple conversion routines used by the DAQ970A are compatible with the International
Temperature Scale of 1990 (ITS-90).
Keysight DAQ970A User's Guide 189
4Measurement Tutorials
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