For example: Agilent E4440A or Anritsu 68369
Precision Decade Resistor
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IET RS925D Overview
The RS925D is the world's highest accuracy continuously variable resistance decade for the most exacting calibration and test applications.
The RS925D resistance decade box is a precision resistance source with excellent characteristics of accuracy, stability, temperature coefficient, and power coefficient. All these features serve to make it a laboratory resistance standard, exceeded in performance only by stand-alone standard resistors.
Hermetically sealed wire-wound resistors are used for 1O steps and over. These resistors are carefully conditioned under power and temperature in order to develop the best stability characteristics. Actual experience has shown them to exhibit a storage stability of better than 5 ppm/year, improving as they age. The low-resistance resistors are constructed with resistance wire with a minimum of copper resistance in series to limit temperature coefficient effects.
The resistance substituter has a fixed minimum resistance of 10 mO. This is implemented by mechanically limiting the 10 m? decade from going below the “1” position. In this manner, no zero resistance subtractions have to be made, and the accuracy given is for the absolute reading.