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Technical and scientific discussion of amps, cables and other topics.

Paging John Curl

John,

The Peltier/Seebeck is used for both temp sensing and thermoelectric heating/cooling..

A current put across a junction of dis-similar metals will cause heat to flow, based on the Seebeck coefficients..

The Seebeck coefficients, in microvolts per degree C for some common metals:referred to platinum.

copper: +6.5
Gold +6.5
Nickel -15.0
silver +6.5
Aluminum +3.5

Meaning, a nickel to copper interface will produce 21 microvolts per degree C difference..This type of number is of the order of what you are reporting..

What I'm thinking of is this... Have you tried to correlate the types of metals used in the IC's you test to the amplitude of the "distortion".

What materials are used for your input and output jacks of your test equipment..

Does your equipment reside in a room that has tight temperature control, or does it wildly fluctuate (like my condo)?

I'm wondering if Seebeck/Peltier effects are capable of consuming signal energy, and if so, causing a sine squared loss component..

Cheers, John


http://www.schooljunction.com/seeback_effect.htm


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Topic - Paging John Curl - jneutron 10:36:29 06/06/03 (74)


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