ESI SR104

The esi SR102, SR103 & SR104 are a highly stable (±0.5 ppm/year) and accurate (1 ppm), 100 Ω, 1 kΩ, 10kΩ resistance standards. The SR102, SR103 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 coefficients, 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 Primary Resistance Standard
These resistance standards were designed to provide an important link between Quantum Hall resistance values and traditional decade resistance values. 100 Ω provides unique reference capability.

esi SR103 1000 Ω Primary Resistance Standard
New resistance standard recently developed to improve the range of primary standards available.

esi SR104 10 KΩ Primary Resistance Standard
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 traceability to the SI.

The SR102, SR103, and SR104 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.

esi Primary Standard History

esi originally designed the SR104 in the late 1960s or early 1970s.The primary resistance standards consists of at least 10 equal resistors (R) that are connected in series, parallel, or series-parallel. This results in resistance values that are l0R (SR104), R/10 (SR102), or R (SR103).

Excellent long-term stability and low temperature coefficient was achieved by using matched groups of resistors, constructed using the alloy Evanohm-R on a mica card.