J
[email protected]
- Jan 1, 1970
- 0
I have an thermocouple problem.
Background:
I have two test/measurement setups that are measuring the same
phenomona. I am using the same thermocouple harness in both setups.
This harness comprises of 8 K-type thermocouples paralleled for
averaging. By shooting a signal into the connector for the harness, we
calibrated the system. The harness was verified (for function)
earlier. It checks out to w/in tenths of a degree F. The
thermocouples typically read between 800-1500F. The connector heats up
to about 400F (give or take about a 100F).
Problem:
I am loosing about 8 degrees F from one setup to another. I tend to
believe the 8 degrees..
Any ideas?
Also, any recomendations for a good book or something (in addition to
Omega's stuff) for learning about thermocouples. I understand the
basics about Seebeck, but it is still voodoo chemistry to me. How do
you model such circuits. How would you model a short to a known medal
kinda stuff. That 8 TC harness in parallel would be nice to
understand.
thanks
-josh
Background:
I have two test/measurement setups that are measuring the same
phenomona. I am using the same thermocouple harness in both setups.
This harness comprises of 8 K-type thermocouples paralleled for
averaging. By shooting a signal into the connector for the harness, we
calibrated the system. The harness was verified (for function)
earlier. It checks out to w/in tenths of a degree F. The
thermocouples typically read between 800-1500F. The connector heats up
to about 400F (give or take about a 100F).
Problem:
I am loosing about 8 degrees F from one setup to another. I tend to
believe the 8 degrees..
Any ideas?
Also, any recomendations for a good book or something (in addition to
Omega's stuff) for learning about thermocouples. I understand the
basics about Seebeck, but it is still voodoo chemistry to me. How do
you model such circuits. How would you model a short to a known medal
kinda stuff. That 8 TC harness in parallel would be nice to
understand.
thanks
-josh
