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Calibration of measuring transducers for precision measurement is done by   measuring voltage drop at the resistor standard, produced by output dc   current proportional to the input measured value. Resistance fluctuations due   to the temperature coefficient of the resistor standard are minor, thanks to   the stable temperature conditions in laboratory environment. This fact brings   the need to calculate the effect of resistor self-heating on its resistance.   This thermal effect, produced by the flow of current through the resistor, is   often disregarded. For the precise measurements this can be a significant   source of error and must be quantified. This paper describes mathematical   model of measurement error, resistor self-heating coefficient is defined, as   it’s not usually given in product datasheets. The effect on measurement   results is given in detail. Composite resistor standard prototype is   described, made from off-the-shelf mass produced components, calculated and   hand selected to cancel the self-heating coefficient effects. The prototype   is compared to the existing commercially available high performance resistor   standard

Composite resistor standard for calibration of measuring transducers in laboratory conditions