VIBTOOL 02.2009
33
Maximum value
Bearing damage (i.e. relatively large irregularities in the
surfaces) causes single shock pulses with higher magni-
tudes at random intervals (see the diagram below). These
can sometimes be heard when pressing a screwdriver to
your ear to listen to the bearing. The highest shock pulse
value measured on a bearing is called its maximum value.
The maximum value is used to determine the operating
condition of the bearing as well as the damage already
done.
0
20
40
60
dB
N
Time
Poor
Reduced
Good
Here, the resulting shock pulse
pattern can be seen, indicating
a damaged bearing.
Bearing diagnosis
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