Note
It is not recommended to make moves based on site fit percentages of less than 70%. Sine fit
percentages above 90% provide highest repeatability.
Optionally, you can do the following:
a.
Press F1 Delete/Undelete Point to delete or undelete a selected point.
The point is not really deleted, but is marked/unmarked so that it is not used
when the program fits a sine wave to the data points.
A deleted point is not used in the sine fit calculation. Whenever points are
deleted/undeleted, the fit is recalculated. A minimum of three points is required
for the fit calculation.
A point is deleted to improve the correlation score for the sine fit curve. A
correlation score of less than 70% means data is invalid.
Active data points (displayed as green triangles) are included in the fit calculation
while deleted data points (displayed as red diamonds) are excluded from the fit
calculation.
b. Press F4 Full Screen to display the plot in full screen.
c. Press F5 Change Active Plot to change the active plot (Detector 1 or Detector 2).
The active plot is marked with a red box around it.
The functions selected/available on the screen apply only to the active plot.
d. Press F6 Switch Plot Type to display both the sine wave plots or each individually.
e. Press F7 Undelete All Points to undelete all data points and redo the calculations for
the machine.
When this option is selected, all data points are used in the curve fit calculations.
f. Press F11 Expand X Axis to expand the X axis by a factor of two.
g. Press F12 Compress X Axis to compress the X axis by a factor of two.
h. Press ALT > F3 Cursor Home to place the cursor to the lowest angle value.
i. Press ALT > F4 Clear Cursor to remove the cursor from the plot.
j. Press ALT > F9 Cursor End to place the cursor to the highest angle value.
Sine curve
The sine curve for each machine is used to determine the alignment condition of the
machines and the quality of the acquired data. A lower curve fit percentage means it could
be difficult to complete an alignment job. When a low curve fit percentage occurs, the sine
fit curve can provide clues to the problem.
In a sine fit curve, if the data points appear grouped in straight horizontal rows, configured
in a stair-step pattern, it means the acquired data is possibly bad.
Advanced Laser Alignment
250 MHM-97432 Rev 7
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