You see unknown frequencies are below the
running speed.
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You suspect looseness.
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You want to distinguish between imbalance and
resonance.
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You want to confirm if vibration is
bearing-related (non synchronous).
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You suspect resonance.
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You suspect an electrical problem.
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You suspect a rolling element bearing failure.
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You notice equipment speed varies during data
collection and is smearing the spectrum.
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You want to know the turning speed.
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You suspect gear problems.
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You want to plot the movement of the shaft.
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You want to distinguish between misalignment
and looseness.
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