GMC chervolet camaro 1999 Service Manual page 82

General Information
Frequency
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1
Legend
(1) Amplitude
(2) Reference
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Frequency is defined as the rate at which an event
occurs during a given period of time. With a vibration,
the event is a cycle, and the period of time is one
second. Thus, frequency is expressed in cycles per
second, or Hertz (Hz). Multiply the Hertz by 60 to
get the cycles, or revolutions, per minute (RPM).
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Vibration Diagnosis and Correction 0-79
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(3) Time in Seconds
(4) 1 Second
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