Single Scan Operation
4-13
sample surfaces that are not parallel to the reference surface block to be leveled using the procedure
described after
Figure 4-13: Manual-Leveling Thumbwheel
1
Perform stage leveling while a scan is in progress to view the affect of leveling on the profile trace in real
time. To run a new scan, click
Run
>
Scan
.
2
As the stage is moving and a trace is being generated on the screen, turn the leveling thumbwheel until the
profile trace is tracking in a horizontal line. Clockwise rotation raises the trace and counter-clockwise
lowers the trace profile.
3
Again click
Run > Scan
. The profile must appear totally within the graphic boundaries to achieve the
minimum acceptable manual leveling. If not, repeat the manual leveling procedure above.
NOTE –
For maximum performance of the Dektak 150, it is important to position the sample
surface to /- 0.01º of level. Use the formula
tan-1 (slope of leveled trace)
to
determine the level accuracy.
To verify that the maximum possible level has been obtained, place the cursors to intersect the same
horizontal plane.
The slope analytical function can be used to determine to what degree the stage is out of level. The
slope of the trace between the cursors will be displayed in degrees. This angle indicates the amount
that the trace is out of level. If the angle is greater than +/- 0.01º, repeat the above steps to obtain
minimum possible slope/maximum possible level.
Manual-leveling
thumbwheel
Содержание Dektak 150
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