- High accuracy four-terminal standard resistors
- Resistance Value of: 0.001 Ω, 0.01 Ω, 0.1 Ω
High accuracy four-terminal standard resistors for low values of 0.1 Ω or less. These standards are used for accurate current measurements and for comparisons of low resistances.
- 4 Values available 0.0001 Ω, 0.001 Ω, 0.01 Ω, 0.1 Ω
SRR Series High Accuracy Standard Resistor Specifications
Model | Nominal Value (Ω) | Adjustment to Nominal Value | Maximum Current (A) Air Oil | Temperature Coefficient (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 |
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 |
Resistance Elements: 0.1 Ω, bifilar winding 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 maximum heat radiation
Thermometer Tube: Slotted extending the length of the resistance element
Label: Each standard is fitted with a label that describes its characteristics and operating parameters
Dimensions: 16 cm H x 9 cm Dia (6.3” x 3.55”)
Weight: 0.9 kg (2 lbs)
