Cropico 00x Series

Very high accuracy resistance decade boxes with versatile wide ohm range

High accuracy 0.01% and high performance
Suitable for Pt100 and tranducer simulation
5, 6 8 and 10 Decades
Long term stability ± 20ppm/year

Overview Specification

Cropico 00x Series Decade Resistance Boxes

A versatile range of Series decade resistance boxes available in 5, 6 8 & 10 decades.

High Accuracy and wide ranging from 0.001 ohm to 11 Mega ohm, in a compact lightweight metal case.

The switches have gold plated contacts to ensure a low contact resistance and negligible thermal E.M.F.

Some models employ the Waidner Wolf technique to eliminate the errors switch contact resistance and are particularly suited to Pt100 simulation with resolution as low as 0.001 ohm (» 0.0025°C).

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Cropico 00x Series Decade Resistance Boxes

Technical Specification

005/6/8 SPECIFICATIONS
008-B	008-A	006-C	006-B	006-A	005-B	Decade	Accuracy	Current Max
						10 x 0.001Ω	± 2%	1.4A
						10 x 0.01Ω	± 1%	1.4A
						10 x 0.1Ω	± 0.5%	1.4A
						10 x 1Ω	± 0.2%	300mA
						10 x 10Ω	± 0.01%	100mA
						10 x 100Ω	± 0.01%	30mA
						10 x 1kΩ	± 0.01%	18mA
						10 x 10kΩ	± 0.01%	5mA
						10 x 100kΩ	± 0.01%	1.8mA
						10 x 1MΩ	± 0.05%	0.3mA

Model	No. Decades	Total Resistance	Resolution	Resolution °C when Simulating Pt100	Residual Resistance Ω
005-B	5	1,112.10Ω	0.01	0.025	1Ω
006-A	6	1,112.11Ω	0.001	0.0025	1Ω
006-B	6	11,112.10Ω	0.01	0.025	1Ω
006-C	6	111,111Ω	0.1	---	70mΩ
008-A	8	111,112.11Ω	0.001	0.0025	1Ω
008-B	8	1,111.112.1Ω	0.01	0.025	1Ω

Calibration		Weight
Calibration certificates including UKAS traceable are available on request		005 - 0.5kg 006 - 0.6kg 008 - 0.8kg
Switches		Size
Contact material gold plated brass Contact resistance = 5 milli ohm Insulation Resistance (all paths = 10 giga ohm) Proof voltage 1kV		350mm x 100mm x 80mm (W H D) approx (all models)
Resistors
Temperature Co-efficient: ±3ppm / +20°C to + 85°C ±5ppm maximum over –55°C to +125°C 0.1, 0.01, & 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