Commtest Instruments vb Series Instrument Reference Manual page 144

•
After the initial reading has been taken press
Trial Weight Angle.
•
Press
On the rotor, measure the angle between the tachometer
reflective tape and your weight reference mark. If these
marks are aligned with each other enter zero.
•
Press
tachometer and accelerometer.
•
Press
weight angle.
Notes:
This calculator can only be used with accelerometers.
Angles are measured using the same orientation as is used for the
placement of balance weights i.e. with rotation or against rotation.
The angle orientation defaults to that chosen in the Set Balancing
Parameters Menu. If this orientation is changed, your entered angles
and result will be automatically translated to the new orientation for
you.
Dual plane balance jobs are also supported, with suggested angles
calculated for both planes. However the calculator should only be
applied in cases where each balance plane is physically close to its
accelerometer sensor, and the two planes are well separated from
each other (e.g. by more that the rotor diameter). In particular for
overhung rotors the calculator should only be used in single plane
mode on the closest bearing and balance plane, to help with
reducing the static imbalance only. The CH2 accelerometer and
weight reference mark positions must be in line with those of CH1.
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to enter the tachometer-to-reference-mark angle.
then press and enter the angle between the
and the instrument will calculate a suggested trial
Section 9: Balancing Rotors 135
Suggest