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
Cropico 00x Series Decade Resistance Boxes

Cropico 00x Series Decade Resistance Boxes

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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).

Cropico 00x Series Decade Resistance Boxes

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to Request a Quote

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 Suitable for Pt100 Simulation Resolution °C when Simulating Pt100 Residual Resistance Ω
005-B 5 1,112.10Ω 0.01 0.025
006-A 6 1,112.11Ω 0.001 0.0025
006-B 6 11,112.10Ω 0.01 0.025
006-C 6 111,111Ω 0.1 --- 70mΩ
008-A 8 111,112.11Ω 0.001 0.0025
008-B 8 1,111.112.1Ω 0.01  0.025
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