Frequency Domain
Vibration exists in time, and it is said to be in the "time domain". The representation of a vibration signal in the time domain is a "wave form", and this is what you would see if the signal were displayed on an oscilloscope. If the waveform is subjected to a spectrum analysis, the result is a plot of frequency vs amplitude, called a spectrum, and the spectrum is in the frequency domain. The waveform is said to be "transformed" from the time domain to the frequency domain. Most detailed analysis of machinery vibration data is done in the frequency domain, but certain information is more easily interpreted in the time domain.
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