Answer / d tilston

Cold junction compensation is required when using a
thermocouple, (TC) to measure temperature.
A TC uses two different types of metal to produce a very
small voltage. This voltage varies as the temperature
changes. The wire used on TC must be the same material as
the TC itself, otherwise you have just created another TC.
The voltage from the second TC will cause errors in the
reading from the first TC. When you get back to the device
that is interpreting this small voltage, you will be
connecting it to the copper on the boards of that device.
As stated earlier, this will create another two TCs, one for
each wire, but if your know the temperature at the device,
you can compensate for these additional voltages. That is
where the cold, (not in the process) junction compensation
is required.

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