The Exact frequency math is based on finding the best fit to the theoretical sine wave. The method works best on the signals close to the pure sine wave. It will search and lock to the highest harmonic component in the signal.

Output settigns

Block size defines the calculation interval. The resulting frequency will be updated with this speed, but we need to take care that this interval will be longer than 10 measured periods of the signal.

Amplitude threshold defines the minimum amplitude where the signal is still calculated. If the RMS of the signal is below this limit, the frequency will not be calculated at

Frequency range

By default, the Exact frequency math will search for the highest harmonic in the whole frequency range. You can manually select the freqeuncy range in which the program should search for the highest harmonic. In this case, the freqeuncy will be found in defined freqency range.

Harmonic tracking

More information about the option Track first harmonic can be found on the following link: