Pressure and Temperature coefficients of commercial 1 Ω Standard resistors

摘要

Changes in ambient pressure can effect change in the resistivity of some alloys used in the manufacture of resistors. Increasingly, inter-laboratory resistance comparisons at both national and international levels include laboratories with an ambient pressure significantly different from normal atmospheric pressure. Recent work [1] has also suggested that exposure to small temperature changes such as those experienced during transport between laboratories can have an hysteric effect on the measured value of a resistor. We have investigated the effect of pressure and temperature cycles on a number of commercially available 1Ω resistors. We will present our findings in detail, with particular reference to the implications for high precision inter-laboratory comparisons.