Frequency Measurement

To measure frequency, select ‘Frequency’ in the drop-down box:

Also, set the CAN ID where The K Box will transmit the result.

Set the Rate you wish to measure at:

The Rate parameter affects measurement precision.

The K Box measures frequency using a pulse counter for the selected rate and normalises it to 1 second to calculate the value in Hz = 1 s * N pulses / Rate.

The K-Box averages measured values if the frequency changes for a measurement interval (Rate).

Example:

Selected Rate: 100ms.

The sensor sends at a frequency of 10kHz for 60ms, and the K-Box registers 600 pulses (60ms * 10kHz).

The sensor sends at a frequency of 8kHz. For 40ms and the K-Box registers 320 pulses (40ms * 8kHz).

For the whole measurement interval of 100ms, The K-Box registers a total of 920 pulses.

Normalised to Hz, the measured frequency is 9.2kHz (1 s * 920 pulses / 100ms).

If the Rate is set to 1000 ms, the measurement's accuracy will be 1Hz.

Notes:

• The “Cycle duration” function should be used to measure low frequency with high precision.