An example of a hysteresis error can be seen in a
thermometer with a temperature sensor, like a
bimetallic strip thermometer.
Hereβs how hysteresis error works in this case:
- When the temperature increases, the bimetallic strip bends in one direction and shows a certain reading.
- When the temperature decreases, the strip bends in the opposite direction, but the thermometer might not immediately show the same reading as it did during the increase.
The key here is that the thermometer gives slightly different readings depending on whether the temperature is rising or falling. This difference is the
hysteresis error because the response of the thermometer is not the same for a given temperature, depending on whether the temperature is increasing or decreasing.
In this case, the error is due to
lag or memory effectβthe system behaves differently depending on its previous state (whether it was heating up or cooling down). This can lead to inaccuracies, especially if precise measurements are critical.