Block
Mask
Description
This block measure the duration of one period of a periodic signal. The input signal can be provided using any fixed-point numerical format.
Parameters
This block has no parameter.
Inputs
| Signal | Should be fed with the input signal, on which the frequency measurement is to be applied. |
|---|---|
| RMS | Should be connected to the input signal RMS value. It is used to position the trigger for the frequency measurement. |
| Average | Should be connected to the input signal average value. It is used to position the trigger for the frequency measurement. |
Outputs
| Period | The period of the input periodic signal expressed in the number of 10-ns clock cycles. |
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Characteristics and Limitations
This block calculates the period of most periodic signals. To compute the frequency, it measures the number of clock cycles between two consecutive threshold crossing, after a hysteresis loop.
Periodic signals with many local extrema, such as the hysteresis loop cycles more than once in a period, may mot give correct period values. Good input waveforms include sinusoidal, square, triangular and saw-toothed waveforms. A modulated sine wave is not an appropriate waveform.
The tresholds of the hysteresis loop corresponds to (s(t) - Average > RMS - Average) and (s(t) - Average < -(RMS - Average)).
| Direct Feedthrough | N/A |
|---|---|
| Discrete sample time | N/A |
| XHP support | N/A |
| Work offline | YES |