SRR IET | Alldatasheet
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Long Island, NY IET LABS, INC. in the Gen Rad Tradition www.ietlabs.com TEL: (516) 334-5959 • EMAIL: info@ietlabs.com SRR Series Page 1 of 1 High Accuracy Standard Resistance srr datasheet/October 9 2013 Resistance Elements: 0.1 Ω, bifi lar wind- ing on cylindrical brass formers with PTFE insulation. 0.01, 0.001, and 0.0001 ohm resistance material in the form of straight rods or loops supported on 12 mm brass conductors Terminals: Potential - Copper 4 mm Current - Brass Top Panel: Bakelite marked with the value, class designation and serial number Case: Light alloy, black anodized to give maxi- mum heat radiation Thermometer Tube: Slotted extending the length of the resistance element Label: Each standard is fi tted with a label that describes its characteristics and operating pa- rameters Dimensions: 16 cm H x 9 cm Dia (6.3” x 3.55”) Weight: 0.9 kg (2 lbs) SPECIFICATIONS Four-terminal standard resistors for low values of 0.1 Ω or less. These standards are used for accurate cur- rent measurements and for compari- sons of low resistances. At the base and at the upper fl ange there are openings which allow air to circulate or oil to fl ow through when used in an oil bath. SRR Series Resistance Standard Model Nominal Value (Ω) Adjustment to Nominal Value Maximum Current (A) Air Oil Temperature Coeffi cient (ppm/°C) Stability typical (ppm/yr) SRR-.0001 0.0001 0.02% 100 200 20 25 SRR-.001 0.001 100 ppm 32 60 25 25 SRR-.01 0.01 100 ppm 10 20 5 10 SRR-.1 0.1 30 ppm 3 6 5 10
- Calibration standard
- Reference measuring point in measurement circuit
- Reference resistor in bridge circuit
- Shunt
- Maximum 200 A current in oil Test Conditions - 25 °C in Oil Model Nominal Value (Ω) Current (A) Power (mW) SRR-.0001 0.0001 30 90 SRR-.001 0.001 10 100 SRR-.01 0.01 3 90 SRR-.1 0.1 1 100