Conditioning Thermistor Signals: What You Should Do

NTC thermistors come with their set of guidelines to follow. Earlier we discussed the two things that should never be done when working with conditioning thermistor signals. In this article, the things you should do when it comes to conditioning thermistor signals will be addressed.

It is vital that you understand the requirements of the conditioning thermistor signals. Understanding the needs is the most important part of the entire process. The three areas that the operator must be conscious of are the temperature sensing range, the temperature sensing accuracy, and the temperature sensing resolution. Without knowing these thermistor temperature sensing requirements, it will be difficult to obtain accuracy.

When it comes to conditioning thermistor signals, you should use ratiometric circuits. Ratiometric circuit refers to the ratio of voltages being sensed rather than their absolute values. Some examples of ratiometric circuits to use are resistor dividers and Wheatstone bridges.

Operators of conditioning thermistor signals should treat their ADC input channels correctly. Before you hook your resistor divider into the ADC input channel, the channel should be analyzed. You must be aware of the input leakage and the input capacitance of your ADC input channel before use.

One more thing operators must do when working with conditioning thermistor signals is to understand the thermal properties of the thermistors. There are two characteristics of thermistors that can seriously cause trouble: self-heating and conduction through leads. One must fully understand these features, so you do not face any issues when working.

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