This is known as a 4-wire measurement. Measuring in this manner eliminates errors during
measurement, which would be produced by additional wire length. Some systems have a 3-wire
connection. In this case omit one current lead and follow the instructions of your measurement
system manual. Table 1.1 states the Pt-100 resistance values as a function of temperature. Please
note that for use in formula 1.2, one must use Kelvin, not degrees Celsius or Fahrenheit. Most data
acquisition systems have standard readout and conversion for Pt-100's.
As an option one can replace the Pt-100 with a 10k Ohm thermistor. The thermistor resistance
values as a function of temperature are indicated in table 1.2.