The self-heating of the thermistor produces a systematic error in temperature measurements. How could it be reduced?

Question

BlackTom AI · Accepted Answer

The question concerns reducing the self-heating error of a thermistor in a temperature measurement setup.
Option 1: by increasing the gain of the amplifier. While higher gain can improve signal amplification, it does not address the root cause of self-heating in the thermistor and thus will not reduce the systematic error caused by its own heating.
Option 2: by reducing the value of R1. Lowering R1 would typically increase current through the thermistor (depending on the circuit configuration), which could actually worsen self-heating rather than lessen it, thereby increasing the measurement error rather than reducing it.
Option 3: by increasing the value of R1. Increasing R1 reduces the current flowing through the thermistor, which directly reduces the power dissipated as heat in the resistor. With less self-heating, the systematic error associated with the thermistor's own temperature rise diminishes, improving measurement accuracy.

LC Electrical Engineering 1 - 28604 Thermistor Lab (Lab 3) Quiz

The self-heating of the thermistor produces a systematic error in temperature measurements. How could it be reduced?

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