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Cropico RBB Decade Resistance Box
HIGH ACCURACY DECADE BOXES WITH VERSATILE
WIDE OHM RANGE
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
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Specifications
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Calibration
Calibration certificates including UKAS traceable are available
on request
Switches
Contact material gold plated brass
Contact resistance = 5 Mega ohm
Insulation Resistance (all paths = 10 giga ohm)
Proof voltage 1kV
Resistors
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
Weight
RBB5 - 0.5kg
RBB6 - 0.6kg
Size
350mm x 100mm x 80mm (W H D) approx (all models)
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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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