STANDARD RESISTOR

5615 Standard Resistor. High Value Resistance Standard.
5686 Standard Resistor. Low Value Resistance Standard.
The design of our standard resistors is based on work carried out over many years with the co-operation of the National Physical Laboratory. 

Standard Resistor

5615 High Value Resistance Standards

These high resistance value Standard Resistors are of similar appearance to the Type 5685/5686 Series, but of higher resistance value. 

The resistance elements are specially wound in a strain-free manner from selected precision resistance alloy. These resistors can be supplied with a NAMAS Certificate.

5686 Low Value Resistance Standards

These four-terminal Standard Resistors are for direct current use and have three nominal values: 
0.001, 0.01, 0.1 Ohms. 
They are sealed into stainless steel cases and oil filled. 

These resistors are suitable for air cooling or for use in a temperature controlled enclosure or oil bath for greater stability. 

The resistance elements are made from selected manganin which is heat treated to improve stability and to reduce temperature coefficient. Joints are silver soldered with copper being used for connections to the terminals. The insulating material is high grade phenolic and the panel is fitted to the stainless steel can by means of an ‘0’ ring. 

For most accurate work the recommended wattage dissipation is 10 milli-Watts but up to 1 Watt may be dissipated without harm to the elements. (In the case of the 0.001 Ohm Resistor the current should not exceed 10 amperes, 100 milli-Watts).

A Test Certificate giving the actual resistance value to the limit of error and temperature coefficient at 20°C will be supplied with each Standard Resistor.