[sdiy] stupid solder

[Tony Allgood]

> Or even two different metals simply connected together with a
temperature difference - thermoelectric/Seebeck effect.

This can and does cause problems to high accuracy instrumentation
measurements. Sometimes great lengths are gone to stop this from
happening. Microwave detection is/was done in a sealed box often with
some sort of temp control. Not only to control the problems with the
detector itself but with disimilar metal junction effects.

I think this has probably changed since my days at temp control in the
late 80s. I guess they will have some sort of quick software driven
recalibration now.

The seebeck effect is pretty small and other factors are far more
important in most cases.

Regards,

Tony Allgood                       Penrith, Cumbria, England

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