ESI SR1010 Resistance Transfer Standard (100 K)

This is a used ESI SR1010 resistance transfer standard (100 K) consisting of 12 equal resistance steps.
The 12 precision resistors are connected in series by specially designed true 4-terminal junctions. These special junctions assure that a 4-terminal measurement of a series of resistors agrees with the sums of the individual resistors in the series. Accurate parallel connections can be made with a Parallel Compensation Network and Shorting Bars connected to the junction.
These standards can be connected to provide three decade values:
10 resistors in series, 10 x R
9 resistors in series – parallel, 1 x R
10 resistors in parallel, R/10
The ESI SR1010 meets or exceeds all of the requirements for resistancetransfer standards in precision measurement applications. When used with the connecting networks and shorting bars, it provides one ppm transfer accuracy. The part per million accuracy is assured as the series value is equal to 100 times the parallel value to better than 1 ppm . The series – parallel value relative to either the series value or the parallel value can be found to better than 1 PPM by making a 1 : 1 comparison with the remaining tenth resistor and a simple calculation.
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