# Cycle Duration Measurement

To measure the duration of a cycle, select Cycle Duration in the drop-down box:

<figure><img src="/files/jdzUxa8RhjPVQbvbOaUU" alt=""><figcaption></figcaption></figure>

Frequency can then be calculated using the following formula:

#### F = 1 / T

In this case, this frequency is NOT average frequency. It is instantaneous frequency.

The KBox will wait until the cycle measurement is finished before sending a CAN message with the duration. If the cycle duration is long, the messages may be sent slower than the selected Rate.   &#x20;

If the Cycle duration is shorter than the time between messages set by the Rate, the duration will be re-calculated before being sent.


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