> For the complete documentation index, see [llms.txt](https://docs.influxtechnology.com/support_guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.influxtechnology.com/support_guides/k-series-product-manual/k-series-product-manual/k-box-product-manual/configuring-the-k-box/using-the-k-cal-software/configuring-the-digital-channels/cycle-duration-measurement.md).
# Cycle Duration Measurement
To measure the duration of a cycle, select Cycle Duration in the drop-down box:
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.
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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