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  Measurement, Test and Calibration
  Calibration problem - Verification vs. Calibration

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Author Topic:   Calibration problem - Verification vs. Calibration
Oleg
Lurker (<10 Posts)

Posts: 3
From:Boston, MA USA
Registered: Jul 1999

posted 08 July 1999 01:56 PM     Click Here to See the Profile for Oleg   Click Here to Email Oleg     Edit/Delete Message   Reply w/Quote
My job is to design a data acquisition system for an enviromental chamber which will be used for package testing. I have an option to buy a complete system, which would enable me to easily calibrate thermocouples on site, from one company, however their price is unreasonably high.
Thus, I am trying to use a combination of equipments from different companies (data loggers, calibrators and thermocouples). I would really appreciate if somebody could answer the following question:

After one notices a drift in the calibration of the thermocouple (using a dry well or a temperature bath), is there an automatic way to compensate for it? Or would I have to send the faulty thermocouple to an outside lab?

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Lassitude
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Posts: 89
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Registered: Jun 99

posted 08 July 1999 02:43 PM     Click Here to See the Profile for Lassitude   Click Here to Email Lassitude     Edit/Delete Message   Reply w/Quote
I'm old school, but as I remember when a thermocopuple started to drift we re-welded the end of the thermocouple and evaluated the monitor box. The thermocouple only provides a voltage or resistence at a temperature. This is to say you calibrate the box which measures the wire resistence/voltage - not the thermocouple. I would think you would have to repair the box if there is a drift. I do not know of a simple 'corrective' device or method.

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