User Manual
6-6 Acquiring Alignment Data
Standard
- this mode of operation (sometimes referred to as the Unidirec-
tional Mode) is the mode that is most often used during Auto Sweep align-
ments. In this mode, a direction of rotation is automatically defined for data
acquisition based on the first rotation to progress past the starting point by
20 degrees. In the Standard Mode, data acquired in the Data Acquisition
Direction of Rotation will always overwrite any previous data stored at the
same angular position. This includes data acquired at its defined angle posi-
tion. In this mode of operation, once the direction of rotation is defined by
the laser heads, only the data in that direction of rotation will be acquired;
therefore, any backward rotation of the shaft due to backlash will not be
acquired and thus will not affect the alignment results. The following sce-
nario illustrates this more clearly.
1. ··· When the analyzer initializes the laser heads, all data is cleared and
their current position is defined as the Starting Point for
determination of the data collection direction.
2.··· If the laser heads are rotated less than 20 degrees in the counter-
clockwise position from the defined starting point, data is collected
for this rotation but it is not committed and permanently stored.
3.··· If the counter-clockwise rotation is stopped before the 20 degrees and
laser heads are now rotated in the clockwise direction, data will be
ignored (not acquired) until the Starting Point is reached again. At this
point all data collected in the counter-clockwise direction is cleared
and the data acquisition is started in the clockwise direction.
4.··· This mode of operation will continue as long as the laser heads are
rotated in both the clockwise and counter-clockwise directions until a
rotation of more than 20 degrees occurs in on of the directions of
rotation. Once the 20 degrees point is passed, all acquired data is
committed and stored and the direction of rotation is defined as the
Data Acquisition Direction of Rotation.
5.··· Now data will only be acquired when the laser heads are rotated in
the same direction as the defined Data Acquisition Direction of
Rotation.