Section 4 — Measurement Types and their Uses
54
Broadband high frequency noise (haystack)
Analyze Demodulation Data
Measuring, recording, and viewing data is exactly the same for a
Frequency/Acceleration spectrum. You can also transfer the
demodulation spectra to Ascent and analyze it with the same
techniques used for normal spectra (e.g. trend plots, alarms, fault
frequencies, bearings, and gears).
Here are some points to remember when analyzing demodulation data:
• Bearing tones that appear in the demodulated spectrum but
NOT in the normal spectrum are a good early warning indicator
of insufficient lubrication (and other problems).
• As the bearing deteriorates, the baseline noise level increases
and bearing tones develop running speed sidebands.
• In the final stages of bearing wear, the bearing tones may
become less prominent as cracks and pits become more
rounded and distributed over the race.
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