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It's used to determine the temperature of the filament, from R = Ro(1 +
alpha*theta). For Ro we use the smallest I and V that we can measure to 2
SD, using the best meters we have. We use the tcr of tungsten as found in
the data book.
I will bet that this is a wildly inaccurate way to determine temperature.
Why do you expect the resistance to vary linearly with temperature over
a range of nearly a factor of ten when you already know its resistivity
varies by more than factor of ten? You need a thermometer, and the optical
pyrometer is the thermometer of choice for this purpose.