Commtest Instruments vb Series Instrument Reference Manual page 157

After a few seconds, the instrument displays the speed of the rotor in
RPM and Hz, the vibration level due to the imbalance (i.e. amplitude
at 1X the rotor speed), and the phase angle of the vibration. Note
that our recording shows an amplitude of 3.8 mm/s. The aim is to
reduce this to an acceptable level.
•
Wait for the readings to stabilize then press
recording.
The Trial Readings Menu will again be displayed. The Initial Reading
measurement is shown using the amplitude and units you selected
from the Set Balancing Parameters Menu, and includes the phase
angle of the imbalance.
148 Section 10: Balancing Walk-through
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