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Cropico RBB Series

The Cropico RBB Series Decade Resistance Boxes are precision-engineered for long life, reliability, and calibration stability. Using high-quality wire wound resistors and in-house designed switches, the RBB Series ensures dependable performance in demanding test environments.

All units are supplied with a certificate of conformity, and all measurements are fully traceable to International Standards. Special models are available for temperature (Pt100) simulation and insulation resistance simulation.

Model Options

Function

• High accuracy decade resistance substitution boxes
• Long-term calibration stability and reliability
• Suitable for Pt100 temperature simulation (specific models)
• Wide resistance range from 0.001 Ω to 11.111 MΩ
• Robust construction for laboratory and industrial use

Technical Specifications

decades available

  • 10 × 0.001 Ω → ±2% (2000 mA)

  • 10 × 0.01 Ω → ±1% (2000 mA)

  • 10 × 0.1 Ω → ±0.5% (2000 mA)

  • 10 × 1 Ω → ±0.2% (600 mA)

  • 10 × 10 Ω → ±0.05% (200 mA)

  • 10 × 100 Ω → ±0.05% (60 mA)

  • 10 × 1 kΩ → ±0.05% (20 mA)

  • 10 × 10 kΩ → ±0.05% (6 mA)

  • 10 × 100 kΩ → ±0.1% (2 mA)

  • 10 × 1 MΩ → ±0.1% (0.6 mA)

residual resistance

  • Typically 1 Ω (low resistance ranges)

  • 0.012–0.013 Ω (higher resistance ranges)

resolution when simulating pt100

  • As fine as 0.0025 °C depending on model

certification

  • Supplied with certificate of conformity

  • Traceable to International Standards

Model Options and Part Numbers

Model No. of Decades Total Resistance Resolution Suitable for Pt100 Residual Resistance Part No.
RBB5-B 5 1,112.1 Ω 0.01 Ω Yes 1 Ω 930171
RBB5-C 5 11,111 Ω 0.1 Ω No 0.012 Ω 930172
RBB5-D 5 111.11 kΩ 1 Ω No 0.012 Ω 930173
RBB5-E 5 1.1111 MΩ 10 Ω No 0.012 Ω 930174
RBB5-F 5 11.111 MΩ 100 Ω No 0.012 Ω 930175
RBB6-B 6 1,112.11 Ω 0.001 Ω Yes 1 Ω 930176
RBB6-C 6 11,112.1 Ω 0.01 Ω Yes 1 Ω 930177
RBB6-D 6 111.111 kΩ 0.1 Ω No 0.013 Ω 930178
RBB6-E 6 1.1111 MΩ 1 Ω No 0.013 Ω 930179
RBB6-F 6 11.111 MΩ 10 Ω No 0.013 Ω 930180
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