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Cropico RBB Datasheet

Cropico RBB Datasheet
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RBB HIGH ACCURACY DECADE BOXES WITH VERSATILE WIDE OHM RANGE Resistance Decades & Standards 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°C) are required. key feature RBB 5 and 6 decades available n Total Range 11.111 Mega ohm n Smallest Steps 0.001 milli ohm n Accuracy 0.05% for premium dials n Resistance coils wound in selected low TC wire n Special models for Pt100 simulation n Special Waidner Wolff decade minimises switch contact resistance n Special model for insulation simulation n Bracken Hill, South West Industrial Estate, Peterlee, County Durham, SR8 2SW United Kingdom Tel: +44 (0) 191 586 3511 Fax: +44 (0) 191 586 0227 Email: sales@cropico.com Web: www.cropico.com

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RBB SPECIFICATIONS 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 / +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)...

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