The Analyzer Module
How to Collect Standard Vibration Measurements
Window – The type of window used in the FFT processing. A window function must be
applied to any periodic time record prior to performing an FFT to minimize leakage
errors. The Hanning and Flattop window functions attenuate to zero both the leading
and trailing edges of the time domain buffer (to prevent leakage error caused by
discontinuities in the time record). Press the right arrow to view the choices:
Hanning - A dynamic signal analyzer window function that provides better
frequency resolution than Flattop, but with reduced amplitude accuracy.
Useful for machine vibration measurements, general purpose measurements,
and measurements containing random noise.
Hamming - A dynamic signal analyzer window function that is commonly used
in narrowband applications. The window is optimized to minimize the
maximum (nearest) side lobe, giving it a height of about one-fifth that of the
Hanning window.
Flattop - A dynamic signal analyzer window function that provides the best
amplitude accuracy for measuring discrete frequency components. Useful for
calibration or machine vibration measurements using displacement probes in
fluid film bearings.
Uniform – A dynamic signal analyzer window function with uniform weighting
across time. Useful for measuring transients or mechanical response
measurements and in tracking mode.
Save – If desired, from the measurement setup screen, you may press the Save
function button to save the measurement setup for easy reuse in the future. Reference
the following How to Save, View, and Delete Analyzer Measurement Results section
for details on how to save your measurement setup.
• After you are finished with your measurement setup changes, press the Start
function button to begin the measurement using the new settings. The
measurement is performed and the initial measurement results display.
4 - 12 SKF Microlog - GX Series
User Manual
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