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How long does it take for a waveform to repeat itself?
In other words, the time it takes for the waveform to repeat itself. Then this period can vary with each waveform from fractions of a second to thousands of seconds as it depends upon the frequency of the waveform. For example, a sinusoidal waveform which takes one second to complete its cycle will have a periodic time of one second.
How is the duty cycle of a square waveform determined?
When square wave waveforms are used as “clock” signals in digital circuits the time of the positive pulse width is known as the “Duty Cycle” of the period. Then we can say that for a square wave waveform the positive or “ON” time is equal to the negative or “OFF” time so the duty cycle must be 50%, (half of its period).
How are square shaped waveforms related to each other?
We know that square shaped electrical waveforms are symmetrical in shape as each half of the cycle is identical, so the time that the pulse width is positive must be equal to the time that the pulse width is negative or zero.
How to calculate the period of a rectangular waveform?
A Rectangular waveform has a positive pulse width (Mark time) of 10ms and a duty cycle of 25%, calculate its frequency. The duty cycle is given as 25% or 1/4 and this is equal to the mark time which is 10ms, then the period of the waveform must be equal to: 10ms (25%) + 30ms (75%) which equals 40ms (100%) in total.
How is time waveform data used in vibration analysis?
The analysis of time waveform data is not a new technique. In the early days of vibration analysis time waveform data was viewed on oscilloscopes and frequency components calculated by hand. The relationship between frequency and time is as follows:
Which is the most common waveform in electrical signals?
Amplitude: – This is the magnitude or intensity of the signal waveform measured in volts or amps. Periodic waveforms are the most common of all the electrical waveforms as it includes Sine Waves.
How many lines should be used for time waveform analysis?
For time waveform analysis it is recommended that 1600 lines (4096 samples are used). This ensures that the data collected has sufficient accuracy and key events are captured. In most data collectors averaging is performed during the FFT process.