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The Cropico RBB Decade Resistance Box offers versatile resistance options with 5 and 6 decades available. Featuring a highest range of 11.1111 Megaohm and smallest steps of 0.001 milliohm, it ensures precision and flexibility in resistance settings.
Key Features:
– Available in 5 and 6 decades
– Highest range up to 11.1111 Megaohm
– Smallest steps of 0.001 milliohm
– Premium dials ensure 0.05% accuracy
Designed for a wide range of applications, the Cropico RBB Decade Resistance Box combines high accuracy with durability in a rugged case.
The switches are gold plated to minimize contact resistance and thermal E.M.F., ensuring reliable performance. Certain models utilize the Waidner Wolf technique to mitigate errors resulting from variations in switch contact resistance. These models are ideal for applications requiring ultra-low resolutions, such as Pt100 simulation, where precision down to 0.001 ohm (approximately 0.0025°C) is essential.
| RBB5 | RBB6 | Decade | Accuracy | Current Max mA | |||||||
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| 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 |
|---|---|---|---|---|---|---|
| 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 certificates including UKAS traceable are available on request
RBB5 – 0.5kg
RBB6 – 0.6kg
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)
Temperature Co-efficient:
±3ppm / +20°C to +85°C ±5ppm maximum over –55°C to + 125°C 0.1, 0.01, and 0.001 dials 10ppm/°C
Full Load Stability:
±35ppm/10,000 hours ±50ppm/26,000 hours
No Load Stability:
±25ppm/10,000 hours ±35ppm/26,000 hours
Over full temperature range:
-50°C to +125°C
Power Rating:
0.33 watt (+85°C) 0.25 watt (+110°C)
Maximum Continuous Working Voltage:
70Vdc / 33vrms
Noise:
Essentially non-measurable <1.5 mV/°C
Thermal E.M.F:
<0.4mV/°C typical
Encapsulation:
Moulded epoxy
Windings:
Exclusive ‘air cushioned’ technique provides virtually stressless elements for improved performance. Non inductively wound. Direction of winding reversed at half turns point
