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NOTE
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Chapter 9 Flatness Measurements
Completing the Set Up Flatness Screen
In the Optics box, do the following:
a. In the Foot Spacing field, enter the size of the foot spacer you chose.
b. If your interferometer has a calibration factor stamped on it, enter the
factor here. Otherwise, leave this field at 1.
Your optics will only have a calibration factor if you have had them
calibrated. This calibration provides accuracy within 0.2% of your
reading.
Select the line you plan to measure by clicking the corresponding
numbered button on the diagram.
Be sure that the number of stations in the Line Setup box (labeled Line #)
equals the number of stations for that line on your measurement grid. If it
does not, recheck your foot spacer and line lengths.
If you have already measured one or more lines, these lines are grayed
out. If you want, you can select one of these lines to measure again, for
example, to average the measurement data with the existing data.
After you select a line, the number of stations on the line is displayed in
the Line Setup box. If you selected a line that you have already measured,
an option box is displayed in the Line Setup box.
In the Line Setup box, do the following:
a. Indicate the optic's direction of travel for this measurement by
selecting the appropriate button on the left side of the Line Setup box.
b. If you selected a line that you have already measured, indicate how
you want the software to process the measurement data you are about
to collect:
•
To overwrite the existing data with the data you are about to
collect, select Overwrite Existing Data.
•
To average the data you are about to collect with the existing data,
select Average with Existing Data.
You are now ready to check the alignment for beam strength.
9-28
Measurements Reference Guide
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