Determining the Influence of Temperature on Various Types of Standard Resistors

摘要

The temperature coefficient of standard resistors of various types is well-known to within an acceptable uncertainty, for the purposes that these resistors are used for in most calibration laboratories. There are instances where this information is insufficient, or not available from the manufacturer. A set of pre-used high precision resistors was recently acquired by the CSIR National Metrology Laboratory (CSIR NML) for maintenance of the resistance scale above 1 Ohm. These resistors were received without any data of their temperature coefficients, and it was decided to measure the temperature coefficient of these resistors with as high a precision as possible. A high precision oil bath was available for this purpose, and a general procedure for this determination was developed.