Section 3: Onsite Analysis - Measurement Menu
41
6. Bump Test
The bump test is a useful vibration analysis technique to help identify
resonance frequencies in a machine's structure. It requires ‘bumping’
(i.e. hitting) the machine structure when the machine is stopped,
while taking a peak hold measurement. Careful selection of the
mallet or hammer is required along with the strength and direction of
the bump to ensure that suitable frequencies are injected into the
structure without causing damage.
• From the Main Menu press
Measure then to
display the Bump Test Menu.
The only parameter you need to set is the Fmax value. This can be
done in two ways:
¾ Press
to display the Machine Running Speed Menu
then use the number keys to enter an RPM value. The
Fmax will be set to 5 x the RPM (or rounded up to the
closest value).
OR
• Press
to display the Set Fmax Menu and use or
to select a value.
• Once the Fmax is set press
to begin sampling.
• 'Bump’ the machine with the hammer.
• Repeat several times.
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