Electronics > Metrology

Binding posts/banana sockets cleaning on DMMs/metrology lab gear?

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Kleinstein:
Something like a gold coating does not have a large effect on the thermal EMF, as there will not be a large temperature difference across the thin coating. The same is true with copper oxide. The thermal EMF data for the semiconductor materials like the copper oxide, tellurium and silicon depend very much on the doping / purity. They values can even change sign: p-doped is usually positive and n doped negative.

For the wire material one has to take some extra care: some materials can change there thermal emf from mechanical deformation. So just bending a wire a few times can cause is thermal EMF if there is a temperature gradient in just that place. 

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