Trimmable wirewound resistance temperature transducer
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United States of America Patent
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-
Jan 19, 1982
Grant Date -
N/A
app pub date -
Aug 1, 1980
filing date -
Aug 1, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transducer for measuring temperature by means of the temperature-induced resistance change of a coil of wire includes, connected to the coil, a deposited film whose resistance-versus-temperature characteristic is substantially the same as that of the wire. The complete transducer assembly is calibrated at a fixed temperature by physically removing portions of the deposited film until a desired resistance is attained. The bulk of the resistance is contributed by the wire, while the film contributes only a small percentage of the total. The transducer thus maintains the desired precision, repeatability and stability of a wirewound transducer while at the same time being capable of calibration by trimming techniques commonly used for adjusting film resistors.
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