Instantaneous Frequency

Calculation of the instantaneous frequency of a time signal.

The documentation of the corresponding PLC function block can be found here: FB_CMA_InstantaneousFrequency

The documentation of the TwinCAT 3 Condition Monitoring PLC library can be found here: Overview.

Configuration options

FFT Length: is the length of the FFT. It must be greater than one and an integral power of two.
Window Length: is the length of the analysis window in samples. The length must be greater than one and an even number.
Sample Rate: sampling rate of the incoming time signal. The value is used for the scaling of the result in Hz.
Number of Channels: defines the number of independent channels. This must be greater than zero.
Magnitude Threshold: defines the limit value for the numerical calculability of the instantaneous frequency.

Output: output array of half window length containing the calculated instantaneous frequency.
Cnt Results: specifies the number of output arrays calculated.
New Result: is a Boolean value that indicates whether a new result was obtained in the current cycle.