Description:
The SR1010 meets or exceeds all of the requirements for resistance transfer standards in precision measurement applications. It is easily configured to transfer resistances up or down a decade from their initial resistance value. When used with the connecting networks and shorting bars, it provides 1 ppm transfer accuracies.
Each transfer standard contains twelve equal value precision resistors 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 the Parallel Compensation Network and the Shorting Bars connected to the junctions.
These standards can be connected to provide three decade values: 10 resistors in series, 10R: 9 resistors in series — parallel, 1R: and 10 resistors in parallel, R/10. 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.
The accuracy and precision of the individual resistors also make the Model SR1010 ideal for use as a multi-value standard resistor or reference voltage divider.
Features:
•Each device configurable to 10R, 1R, and R/10
•Accuracy of transfer better than 1 ppm
•Six models, decade values from 1 Ω/step to 100k Ω/step
•Establish decade resistances from 0.1 Ω to 1M Ω
•Calibration readings traceable to NIST are provided
Standard Values
1, 10, 100 Ω/step; 1, 10, 100 k Ω/step
Accuracy
Transfer*** : ±(1 ppm + 0.1 µΩ) at parallel value for 100:1 transfer ±(1 ppm + 1 µΩ) at series-parallel value for 10:1 transfer
Initial : ±20 ppm of nominal value matched with in 10 ppm
Long-Term : ±50 ppm of nominal value
Calibration : ±10 ppm
Calibration Conditions
23 ºC, low power, four-terminal measurement
Temperature Coefficient
±5 ppm/ºC matched within 3 ppm/ºC for 100 Ω and higher
±1 ppm/ºC for 10 Ω
±15 ppm/ºC matched within 5ppm/ºC for 1 Ω
Power Coefficient
±0.1 ppm/mW per resistor for 100 Ω and higher
±0.02 ppm/mW per resistor for 10 Ω
±0.3 ppm/mW per resistor for 1 Ω
Maximum Power Rating
1Ω/step or 5 W distributed over 10 resistors
Breakdown Voltage
1500 V peak to case
Leakage Resistance
Greater than 1012 Ω from terminal to case
Calibration Data
Initial calibration readings are affixed to instrument
Dimensions
Height 11.20 cm (4.4 in)
Width 31.00 cm (12.2 in)
Depth 10.15 cm (4.0 in)
Weight 1.5 kg (3.25 lb)
Included Accessories
Manual P/N 8502
Z540 Compliant Calibration for SR1010 with Certificate and Data P/N OPT-Z540
Optional Accessories
Shorting Bars P/N SB103
Series Parallel Compensation Network P/N SPC102
Parallel Compensation Network P/N PC101
