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Screen
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THERMISTOR
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Because the resistance of thermistors used for temperature measurement is much
higher than for PRTs, lead resistance is not normally a problem.
Use an external reference resistor with thermistors since the resistance of the
internal standards is too low. Thermistors have much higher temperature
coefficients than PRT, so the tolerances on the reference resistor are
correspondingly less demanding, making them relatively inexpensive.
The top terminal should be connected to the screen of the thermistor’s lead
(where present) to minimise electrical noise picked up by the wires. The high
resistance of thermistors makes them more prone to picking up electrical noise, it
is therefore even more important to use a screened cable and connect this to the
screen terminal on the microsKanner than when using PRTs.
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Issue: 1.01