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STANDARD RESISTORS
RW Wilkins Standard Resistors. High accuracy < 20 ppm.

RW Wilkins Standard Resistors.
RW Wilkins Standard Resistors are made from a specially selected alloy having a low temperature coefficient mounted in a strain free manner, on formers made from a material of low dielectric loss but of high mechanical stability. All connections are welded. Prolonged heat treatment of the elements ensures long term stability and low temperature coefficient of resistance. The elements are hermetically sealed in stainless steel containers which are first evacuated and then filled with dry oil (No.4 Kerosene).
Provision is made for inserting a thermometer, but the resistors are intended to be used in a controlled temperature oil bath

  • High Accuracy, <20ppm

  • Excellent long term stability

  • Low temperature coefficient

  • Rugged stainless steel construction

Maximum dissipation for the resistors is 1 watt, but the highest performance will be obtained with dissipation limited to 10 milliwatts, which is the ideal working condition.
No damage will occur if the dissipation is increased to 1 watt, but self heating will affect the resistance value after a few minutes.

Specification
Tolerance ±20ppm
Test certificate 3 ppm for 1, 10, 100 & 1000 Ohms
5 ppm for 25 Ohms
Optional calibration Up to ±0.1ppm, depending on calibration laboratory
Stability 2 ppm per year
Temperature coefficient Typically 2 ppm/°C
Frequency dependence 1 ppm up to 1592Hz
Working temperature 20°C, but within the range of 15°C to 40°C
Dissipation 10 milliwatts (recommended), 1 watt (maximum)
Load coefficient Approximately 6 ppm / watt
Dimensions / weight Diameter: 76mm, Height: 114mm, Weight: 3.3 kg.

ORDER CODES
RWx where x is 1, 10, 25, 100 or 1000 ohms.
RWTE1 Thermal enclosure for RW resistor, 36°C fixed.
RWTE2 Thermal enclosure for 2 RW resistors, 40°C max. factory set.

Please email sales@hotektech.com or call 253-927-6186 if you are interested in a purchase, or
  need additional information.

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