Manual Chapter 5

6-16 Acquiring Alignment Data
If you do encounter a machine where this becomes a problem too great to
overcome, consider switching to an alternative method such as 4 Point
Auto.
4 Point Auto
The 4 Point Auto method is a more traditional style of acquiring data for
alignment. The laser heads are mounted on a shaft, and the shaft is then
rotated so that data can be taken when the laser heads are at the 12 o’clock
(0 or 360°), 3 o’clock (90°), 6 o’clock (180°), and 9 o’clock (270°) positions.
The readings are continuously averaged whenever the laser heads are at
one of these positions and automatically recorded when the shaft is rotated
to the next position. The averaging process reduces variation from jitter due
to background vibration or from slight changes in the angular position of
the heads.
The current alignment method is always shown at the bottom center of the
screen. The alignment method is selected from the Alignment Setup menu
which is accessed using the Options key. Once the 4-point method is
shown, set the sample rate. Use the Up and Down Arrow Keys to select the
sample rate and the Number keys on the keypad to toggle the selection.
Sample Rate – determines the number of data samples that are to be col-
lected and averaged together to produce a single Laser PSD reading. Use
the Left and Right Arrow keys to toggle sample rate from 1 to 25 samples.
The default is 2.