esi SR102 & SR104 Transportable Resistance Standards Datasheet and Full Specifications

IET continues to produce the SR102 & SR104 to the same exacting specs as esi/Tegam

DESCRIPTION:
The esi SR102 and esi SR104 are a highly stable (±0.5 ppm/year) and accurate (1 ppm), 100, and 10k resistance standards. The SR102 and SR104 Standards are equipped for five-terminal measurements used for Standard Resistor readings and for Temperature Sensor readings. Individual calibration data, which identifies the Standard Deviation, and the Temperature Characteristics, is supplied with each unit. In addition, each unit is equipped with a thermal well so that the exact temperature of the resistance standard is known. This allows the user to make highly precise, temperature compensated, measurements.

esi SR102 100 Ω Standards
These standards were designed to provide an important link between rather odd Quantum Hall resistance values and traditional decade resistance values. 100 Ω provides unique reference capability.

esi SR104 10 KΩ Standards
This has been the long-standing industry standard for the 10 kΩ. This everlasting standard is the benchmark for high accuracy, stability and low temperature coefficients for calibrations requiring NIST traceability.

The TEGAM precision Transportable Resistance Standards are oil filled, hermetically sealed, five-terminalresistance 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 builtin 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.

Models
SR102 ---------100 Resistance Standard
SR102/DC ----100 Resistance Standard, with No Case, for Oil Bath Immersion
SR104 ---------10 k Resistance Standard
SR104/DC ----10 k Resistance Standard, with No Case, for Oil Bath Immersion

Other Custom Made Values Available.