Publicidad
Idiomas disponibles
Idiomas disponibles
4 Measurement Tutorials
This circuit is the best solution for accurate thermocouple connections.
In some measurement situations, however, it would be nice to remove the need for an ice bath (or any other fixed
external reference). To do this, an isothermal block is used to make the connections. An isothermal block is an
electrical insulator, but a good heat conductor. The additional thermocouples created 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/DAQ973A are compatible with the International
Temperature Scale of 1990 (ITS-90).
226
Keysight DAQ970A/DAQ973A User's Guide
Publicidad
