Seaward RS3/50 Resistance Standards (50Ω, ±25ppm, 3ppm/°C)

Value: 50Ω

Uncertainty of Adjustment @20°C: 0.005%

Uncertainty of Certification: ±25ppm

Temp Coeff Typical 15 to 20°C: 3ppm/°C

Stability Over 1 Year: 0.001%

Dissipation Max in Air Watts: 1

Dissipation Max in Oil Watts: 10

Max. DC Current in Air: 140mA

Max. DC Current in Oil: 450mA

Maximum Operating Voltage: 60VDC, 30Vrms

Terminals

Potential: Gold plated copper 4mm

Current: Nickel

General Specifications:

Dimensions: 160mm (h) x 90mm (diameter) / 6.3 x 3.5” approx

Mass: 0.9kg approx / 2lbs

Case:

Light alloy, black anodised to give maximum heat radiation

Thermometer Tube: Slotted extending the length of the resistance element

Top Panel: Bakelite marked with the value, class designation and serial number

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

Resistance Elemants: 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

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