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Cropico RBB Decade Resistance Box

A versatile range of resistance decade 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 degC) are required.

Key Features

  5 and 6 decades available
  Total Range 11.111 Mega ohm
  Smallest Steps 0.001 milli ohm
  Accuracy 0.05% for premium dials
  Resistance coils wound in selected low TC wire
  Special models for Pt100 simulation
  Special Waidner Wolff decade minimises switch contact resistance
  Special model for insulation simulation

Data Sheet



Calibration certificates including UKAS traceable are available on request


Contact material gold plated brass
Contact resistance = 5 Mega ohm
Insulation Resistance (all paths = 10 giga ohm)
Proof voltage 1kV


Temperature Co-efficient: +/-3ppm / +20degC to +85degC +/-5ppm maximum over -55degC to + 125degC 0.1, 0.01, and 0.001 dials 10ppm/degC

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: -50degC to +125degC

Power Rating: 0.33 watt (+85degC) 0.25 watt (+110degC)

Maximum Continuous Working Voltage: Up to 250V dc

Noise: Essentially non-measurable <1.5 mV/degC

Thermal E.M.F: <0.4mV/degC 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


RBB5 - 0.5kg
RBB6 - 0.6kg


350mm x 100mm x 80mm (W H D) approx (all models)

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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