| 摘要 |
<p>A temperature measuring apparatus is disclosed which measures the output of a temperature probe containing a thermistor transducer while maintaining compatibility with either or two different probe types. At least two temperature input channels are multiplexed along with at least two calibration voltages for each thermistor probe type to the input of parallel amplifiers, there being a different amplifier for each probe type. A detection circuit is provided for automatically determining the type of probe present in each channel. In response to the circuit, other circuitry enables the appropriate amplifier whose output is digitized by a 10-bit A/D converter circuit. A processor using a look up table at least partially linearizes the temperature to resistance curve of the probe type being used in response to the calibration output, the determination of probe type and the A/D circuit output.</p> |
