Primary Resistance Standards

Primary Resistance Standards

SR102 & SR104 Key Features

Highest accuracy and stability
Lowest temperature coefficients
Optional A2LA Accredited ISO/IEC 17025:1999 Compliant Calibration
Primary Resistance Standards

The TEGAM precision Transportable Resistance Standards are oil filled, hermetically sealed, five terminal resistance standards designed for precision bench top or oil bath applications.

The long-term stability of these resistance standards is typically less than 0.2 ppm per year and temperature coefficients are less than 0.1 ppm per degree Celsius. This excellent long-term stability and low temperature coefficient is achieved by using matched groups of resistors constructed of the alloy Evanohm-R.

The resulting low temperature coefficient allows high performance applications of these standards inside or outside an accurately controlled temperature environment. Maximum accuracy is calculated as a temperature corrected resistance value. This is accomplished by using the built-in RTD temperature sensor to measure the internal temperature and referencing a temperature correction chart provided with each unit. The measurement accuracy of the built in RTD thermometer is better than 0.1 degree Celsius.

Very low power coefficients are achieved by using standard resistors constructed with large surface areas like our original Model SR104, 10kΩ standard resistor. The resistors are surrounded by oil to conduct heat generated by the measuring currents out through the stainless steel case. These characteristics facilitate precise laboratory comparisons without critical environmental controls and are used wherever a need for a very accurate, stable resistor of low temperature coefficient is required.

Home | Contact Us | Map

Timing Test & Measurement