Abstract
Silicon diode thermometers are now available commercially which conform closely to a specified, albeit non-linear characteristic. An inexpensive circuit has been developed which allows temperatures to be measured with a resolution of 0.01 K between 1.5 and 25 K, and 0.1 K between 25 and 375 K, and with an accuracy that in most applications will be limited by the calibration accuracy of the diode used. The design is based on a standard integrating analog to digital converter. A microprocessor is not required; precise linearization is achieved by means of a look-up table held in an EPROM. The circuit includes a simple digital interface for transferring data to a computer.
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