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Allen Bradley carbon composition resistors decrease in resistance with
temperature. So the scaling constant k is evidently negative.
Taking a sample A-B 0.27ohm resistor:
Temp (K) Res (ohms)
0.3 10^6
1 10^2
3 3
10 1
30 0.7
100 0.3 (from a graph of Rose-Innes's)
I don't have a curve fitting package here. Can someone else
fit this?
Make that Resistance = r*exp(k*sqrt(temperature))
Assuming that your data is good and that John's statement in true, then
your data does not all lie within the "large range" that John refers to.
I can get a tolerable, but far from excellent fit to no more than three of
these data points--not an impresssive feat for a two parameter fitting
function.
John Mallinckrodt