Understand the drift of the thermistor

What is the drift of the thermistor, there are two kinds of drift, and you can learn it together! The main part of the thermistor is a semiconducting ceramic, and its performance is generally stable. However, if it is used under high temperature and high load for a long time, its resistance value will slightly drift with time, but not too much, no Affect.

The thermistor has zero drift and temperature drift:

1) Time drift

That is to say, for the system, as time increases, it is equivalent to aging the system, so that the structural characteristics of the system will change, resulting in drift.

2) Warm drift

The zero point caused by temperature is unstable. It can be seen that the influence of temperature is the main factor that causes zero drift and is also difficult to control.

Stability refers to the annual drift of the thermistor reference voltage value. This drift amount is then converted into the temperature value according to the temperature-voltage conversion coefficient, that is, the stability = ± ΔV / S / year. Linear thermistor stability is ±0.05 ° C / year. This parameter describes the ability of the thermistor to retain its original characteristics under various conditions of use.

Solve the thermistor temperature drift:

There are two ways to solve the thermistor temperature drift, hardware and software. The hardware method includes string constant resistance method in series and parallel on the bridge arm, bridge arm thermistor compensation method, bridge external series and parallel thermistor compensation method, double bridge compensation technology and triode compensation technology. The software method is to eliminate the offset by the software program. This method is very practical for the digital output sensor. The customer can write it by software, or when the thermistor is equipped with a digital display, it can also be adjusted by the digital display. achieve. It is very convenient.

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