Circuit thermal analysis in PSPICE and temperature coefficients

Published: 12/06/2019
Circuit thermal analysis in PSPICE and temperature coefficients
Source: ELECTRONICS.STACKEXCHANGE.COM

I am tying to perform a thermal analysis in pspice. Resistors needs two temperature coefficients as TC1 and TC2 (if we assume linear change of R vs. T, it's zero) in pspice. But in resistor datasheets (like this ) from Vishay, I've seen that TCR is for example ± 200 ppm/K . What does this ± mean? Why TCR is not a single positive or negative number? Thanks.

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