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Cropico RS3

Cropico RS3

4 terminal construction, high stability resistance standard with wide range


Wide range 0.0001 ohm to 1 Mega ohm
Excellent load coefficient
4 terminal construction
Can be used in air or oil bath
Each standard supplied complete with calibration certificate

Cropico RS3 Resistance Standard

Model Value Uncertainty of Adjustment @20°C Uncertainty of Certification Temp Coeff Typical 15 to 20°C Stability Over 1 Year 
RS3/001 0.0001Ω 0.02% ±200ppm 20ppm/°C 0.0025%
RS3/001 0.001Ω 0.01% ±50ppm 25ppm/°C 0.0025%
RS3/01 0.01Ω 0.01% ±25ppm 10ppm/°C 0.001%
RS3/02 0.02Ω 0.01% ±50ppm 10ppm/°C 0.001%
RS3/05 0.05Ω 0.01% ±50ppm 10pm/°C 0.001%
RS3/0.1 0.0.1Ω 0.003% ±25ppm 10ppm/°C 0.001%
RS3/1 0.003% ±25ppm 10ppm/°C 0.001%
RS/10 10Ω 0.003% ±25ppm 10ppm/°C 0.001%
RS3/25 25Ω 0.005% ±25ppm 10ppm/°C 0.001%
RS3/50 50Ω 0.005% ±25ppm 3ppm/°C 0.001%
RS3/100 100Ω 0.003% ±25ppm 3ppm/°C 0.001%
RS3/250 250Ω 0.005% ±25ppm 3ppm/°C 0.001%
RS3/1K 1kΩ 0.003% ±25ppm 3ppm/°C 0.001%
RS3/10K 10kΩ 0.003% ±25ppm 3ppm/°C 0.001%
RS/100K 100kΩ 0.003% ±25ppm 3ppm/°C 0.001%
RS/1M 0.01% ±25ppm 3ppm/°C 0.002%

 

Model Dissipation Max in Air Watts Dissipation Max in Oil Watts Max. I in Air (Amps) Max. I in Oil (Amps
RS3/001 1 4 100 200
RS3/001 1 4 32 60
RS3/01 1 4 10 20
RS3/02 1 4 7 14
RS3/05 1 4 4.5 9
RS3/0.1 1 4 3 6
RS3/1 2 10 1.4 3
RS/10 2 10 0.44 1
RS3/25 1 10 0.2 1
RS3/50 1 10 0.1 0.3
RS3/100 1 10 0.1 0.3
RS3/250 1 10 0.1 0.1
RS3/1K 1 10 0.03 0.030
RS3/10K 1 10 0.01 0.03
RS/100K 1 1 0.003 0.003
RS/1M 1 1 0.0002 0.0002

*Special values can be made to order

Value in ohms Typical time constant The resistance standards type RS3 were primarily designed as DC standards, however values above 0.1 ohm are non inductively wound and the adjacent AC characteristics are typical
+ 0.34μH/Ω
10Ω + 0.18μH/Ω
100Ω + 0.03μH/Ω
1kΩ + 0.04μH/Ω
10kΩ + 0.6μH/Ω

 

Dimensions

160mm high x 90mm diameter approx         

 

Top Panel

Bakelite marked with the value, class designation and serial number

 

Mass

0.9kg approx    

 

Case    

Light alloy, black anodised to give maximum heat radiation Thermometer Tube: Slotted extending the length of the resistance element

 

Label

Each standard is fitted with a label that describes its characteristic and operating parameters

 

Resistance Elements

Manganin or Zeranin depending on the value. 100 ohm, 1, 10 and 100 kilo ohm low inductance winding on brass formers with PTFE insulation. 0.1, 1 and 10 ohm bifilar winding on cylindrical brass formers with PTFE insulation. 0.01, 0.001, and 0.0001 ohm resistance material in the form of straight rods or loops supported on 12mm brass conductors

 

Terminals

Potential — Copper 4mm Current — Brass        

 

Maximum Continuous Working Voltage

70Vdc / 33vrms


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