• From the Main Menu press Measure Vibration then
press Tach.
• Select the Standard tachometer or Keyphasor® sensor by
pressing Tach Type. This option is only available if
using a vbBalancer+ instrument.
Bump Test
Note: This feature is not available on the vbBalancer instrument
model.
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 Vibration then
press Bump.
• Use the left-hand arrow keys to select a parameter set or
press to create a new one and set the parameters as
required.
• Press to begin sampling and 'bump' the machine with a
hammer. Repeat several times.
Bump test measurements are taken in free run mode and use peak
hold averaging. The instrument will take continuous samples and
update the peak value for each spectral line whenever a line
exceeds its previous value.
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