[volt-nuts] Resistance standard
jfor at quik.com
Wed Dec 16 14:40:07 UTC 2009
On the oil question, you really do need a sealed system, with provisions
for expansion, or the oil will "breathe" with temperature and atmospheric
pressure fluctuations and absorb water.
As to potting, the resistive elements must NOT be strained or the values
will certainly shift. Just think how strain guages are made.
IMO, vacuum would be a bad idea. It is the antithesis of an isothermal
resistor. Any dissipation would lead to heating and value shifts.
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