Abstract
In resistance thermometry, a potentiometer can have certain advantages over a resistance bridge. The method described consists of using the ratio of the ``measure'' to the ``standardize'' voltage of a conventional dc precision potentiometer to measure the ratio of a thermometer resistance to a resistor of known value connected in series with the thermometer. By appropriate selection of potentiometer and thermometer currents, potentiometer range, and known resistor, a measurement direct reading in ohms, or Rt/R0, is obtained. Normal potentiometer measuring procedure is used. Reversal of thermometer current to avoid influence of thermoelectric effects may be included. Tables are provided which indicate temperature resolution achievable by this method at various temperatures and levels of nominal thermometer resistance. Advantages and disadvantages compared with a bridge method are presented and discussed, as are experimental results using the two methods.
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