Bump Test - Commtest Instruments vbBalancer Instrument Reference Manual

From the Main Menu press
•
press
Select the Standard tachometer or Keyphasor® sensor by
•
pressing
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
•
press
Use the left-hand arrow keys to select a parameter set or
•
press
required.
Press
•
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.
84 Section 8: Measurement Types and Their Uses
Tach.
Tach Type. This option is only available if
Bump.
to create a new one and set the parameters as
to begin sampling and 'bump' the machine with a
Measure Vibration then
Measure Vibration then