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SR102 Standard Resistor.

SR102 Primary Resistance Standard is a highly stable and accurate (1ppm), 100 ohm, resistance standard.

SR102 Standards are equipped for five-terminal measurements used for Standard Resistor readings and
for Temperature Sensor readings. 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.

SR102 Primary Resistance Standard

Model  Description 
SR102 SR102 Primary Resistance Standard

Highest accuracy and stability.
Lowest temperature coefficients.
Stability ±1 ppm/year the first 2 years; ±0.5ppm/year thereafter.
Initial Value SR102, SR102/DC ±1 ppm.

Temperature Coefficient.
Alpha (temperature coefficient) less than ±0.1 ppm/°C at 23 °C. Beta (1/2 rate of change of temperature
coefficient) does not exceed 0.03 ppm/°C2 over the temperature range of 18 °C to 28 °C.
This performance is as a passive device without ovens or external power requirements.

Internal Temperature Sensor.
The internal temperature sensor is a 1,000 ppm/°C RTD with integral thermowell provided for calibration.

Termination.
Five-terminal construction, four-terminal resistor with ground intercept for the standard and temperature
sensor. The four resistor binding posts are gold plated tellurium copper to reduce thermal emf.
The ground terminals are brass.

Thermal emf.
Under normal conditions thermal emf at the terminals does not exceed ±0.1 µV.

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