Spectrum
A vibration spectrum is a chart of vibration amplitude versus vibration frequency. The vibration spectrum of a machine component shows the frequencies at which the component is vibrating and the amplitude of vibration at each of these frequencies.
Spectra consist of discrete spectral lines displayed at fixed frequency intervals. The height of each spectral line represents the amplitude of vibration at that frequency. The more spectral lines in a spectrum, the higher the resolution of the spectrum (but more memory is used).
A simplified illustration of a discrete vibration spectrum
The key parameters you need to set are the number of spectral lines and the Fmax to ensure that all crucial information is captured.
- From the Main Menu press
Measure then press 
Spectrum Waveform. - Use the left-hand arrow keys to select a parameter set orbcreate a new one by pressing
and setting theparameters as required. - Press
to begin measuring.
Last Reviewed: 11/Jun/2009 Source: vbSeries Reference Guide Revision 24 March 2009 - pages 64 & 65