Calibration, Maintenance, Troubleshooting and Warranty
Calibrating Z
Rev. B
MultiMode SPM Instruction Manual
305
15.8.7
Finding a Pit with an “A” Scanner
Since it may be dif
fi
cult and/or time consuming to locate a pit in the sample using an “A” scanner,
an alternate method of locating a pit is to use the
Scope mode
in Realtime imaging.
1. After engaging on the surface of the sample set both
Realtime Planefit
and
Offline Planefit
to
offset
. Got to
Scope
mode
.
2. Watching the Scope trace diagram, slowly turn the X-Y stage adjustment screws on the AFM
microscope. (Do not turn more than a 1/2 turn in each direction.)
3. When the scanner tip encounters a pit in the Scope trace diagram, it will display a step in the
normally flat line (see
). Be sure the Z Center position is fairly close to zero (+/-
50V).
Figure 15.8g
Scope Trace screen will display a step when the tip encounters a pit in the reference sample.
After
fi
nding the step in the Scope mode screen, click back to Image mode. The image should now
encompass a portion of one pit.
Scanners larger than “A” can image an entire pit. It is not necessary to change the Realtime and
of
fl
ine plane
fi
ts for these scanners.
Scope Trace
Z range
35nm/div
Scan
