Fluke VIBXPERT II Operating Instructions Manual page 29

Dual channel fft data collector and signal analyzer
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2-20
Options
"Free"
"Fixed weight"
0° position (trigger mark)
Direction of rotation
External
radius
Balanced radius
Tape measure length on the
outer surface of the rotor
"Fixed weight" correction mode
"Meas. tape" correction mode
2.2 Fixed weight
Activate the "Fixed weight" option if only specific masses (e.g. 2g, 5g,
10g) are available for balancing. Then enter the mass of the "Fixed
weight". VIBXPERT calculates two angular positions at which the two
equal weights must be placed.
Select the "Trial/ Trim masses -> Add" option in the "Tools" menu.
The fixed weight m
to the variable weight m
Note
2.3 Measuring tape
The correction mode can determine the position of the balancing
weights with the measuring tape without having to consider a refer-
ence system with angular divisions.
Enter the outer diameter of the rotor in plane A and plane B. The dis-
tance on the outer surface of the rotor is calculated in millimeters (or
inches) from the trigger mark (0° position) and measured counter to
the direction of rotation. Place a tape measure around the rotor and
place the balancing weight at the specified position (i.e. length).
The distance of the balancing weight from the rotational axis is the
balancing radius. This is usually smaller than the outer radius.
In all three correction modes, the calculated specified values can
be changed afterwards. However, the changes should not deviate
significantly from the specified values.
The list in the "Data" field always shows the balancing weights for
the 'Free' correction mode - i.e. mass and angular position.
N ote
Left:
Right:
must meet the following requirements relative
fix
:
free
0.5 x m
< m
< 3 x m
free
fix
free

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