High accuracy decade resistance box with versatile wide ohm range
- 5 and 6 decades available
- Highest Range 11.1111 Mega ohm
- Smallest Steps 0.001 milli ohm
- Accuracy 0.05% for premium dials
A versatile range of resistance Decade Resistance Boxes, available in 5 & 6 decades. Both high accuracy and a wide range, 0.001 ohm to 11 mega ohm, are combined in a rugged case.
The switches used are gold plated to ensure a low contact resistance and negligible thermal E.M.F.
Some models employ the Waidner Wolf technique to eliminate the errors that may be caused by the variations in switch contact resistance. These models are particularly suited to applications such as Pt100 simulation where resolutions as low as 0.001 ohm (» 0.0025°C) are required.
Cropico RBB Decade Resistance Box
RBB SPECIFICATIONS | |||||||||||
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RBB5 | RBB6 | Decade | Accuracy | Current Max mA | |||||||
B | C | D | E | B | C | D | E | F | |||
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10 x 0.001Ω | ± 2% | 2000 | ||||||||
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10 x 0.01Ω | ± 1% | 2000 | ||||||
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10 x 0.1Ω | ± 0.5% | 2000 | ||||
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10 x 1Ω | ± 0.2% | 600 | ||
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10 x 10Ω | ± 0.05% | 200 |
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10 x 100Ω | ± 0.05% | 60 |
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10 x 1kΩ | ± 0.05% | 20 | ||
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10 x 10kΩ | ± 0.05% | 6 | ||||
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10 x 100kΩ | ± 0.1% | 2 | ||||||
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10 x 1MΩ | ± 0.1% | 0.3 |
Model | No. Decades | Total Resistance | Resolution | Suitable for Pt100 Simulation | Resolution °C when Simulating Pt100 | Residual Resistance Ω |
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RBB5-B | 5 | 1,112.1Ω | 0.01 | ![]() |
0.025 | 1Ω |
RBB5-C | 5 | 11,111Ω | 0.1 | — | — | 0.012Ω |
RBB5-D | 5 | 111,110Ω | 1 | — | — | 0.012Ω |
RBB5-E | 5 | 1.1111MΩ | 10 | — | — | 0.012Ω |
RBB5-F | 5 | 11,111Ω | 100 | — | — | 0.012Ω |
RBB6-B | 6 | 1,112.11Ω | 0.001 | ![]() |
0.0025 | 1Ω |
RBB6-C | 6 | 11,112.1Ω | 0.01 | ![]() |
0.025 | 1Ω |
RBB6-D | 6 | 111,111Ω | 0.1 | — | — | 0.013Ω |
RBB6-E | 6 | 1.11111MΩ | 1 | — | — | 0.013Ω |
RBB6-F | 6 | 11.1111MΩ | 10 | — | — | 0.013Ω |
Calibration | Weight | |
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Calibration certificates including UKAS traceable are available on request |
RBB5 - 0.5kg RBB6 - 0.6kg |
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Switches | Size | |
Contact material gold plated brass Contact resistance = 5 Mega ohm Insulation Resistance (all paths = 10 giga ohm) Proof voltage 1kV |
350mm x 100mm x 80mm (W H D) approx (all models) | |
Resistors | ||
Temperature Co-efficient: Full Load Stability: No Load Stability: Over full temperature range: Power Rating: Maximum Continuous Working Voltage: Noise: Thermal E.M.F: Encapsulation: Windings: |