Design News, December 11th, 2006
By Jon Titus, Contributing Writer
Thermocouples measure temperatures over a broad range and at high temperatures. But when a task calls for precision measurements over a smaller, lower temperature range, somewhere from about -80 to 300C, thermistors do the trick. And because thermistors come in small packages, they exhibit fast response times. Manufacturers offer devices with either a positive temperature coefficient (PCT) or a negative temperature coefficient (NTC), which describes how their resistance changes with temperature.
You can indirectly measure resistance by passing a current th...
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