# Zero Offset Calibration

The Power Meter spigot contains load cells which are used to measure the force being applied to the paddle.

The output of a load cell when the shaft is experiencing no force is referred to as the **Zero Offset**. Each load cell has an associated zero offset.

There are two load cells on a Power Meter. The load cells have been designated channels **N** and **O**

The **Zero Offset** of a load cell can drift a small amount with a change in temperature. This is why manufacturers of power meters typically recommend performing a Zero Offset calibration on a semi-regular basis.

A typical **Zero Offset** will change no more than 5 units between calibrations. A difference of 10 or more is an indication that either a bending force is being applied to the shaft, that there is an issue with that particular channel or that you recently traveled from an extremely hot or cold climate.

{% hint style="info" %}
After performing a number of Zero Offset calibrations, it will quickly become clear how frequently or infrequently a Zero Offset calibration is required.

If the Zero Offsets vary by no more than **five** between calibrations, then there is little to be gained from performing a calibration regularly.
{% endhint %}


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