JEOL JSPM-5200 Instructions Manual page 284

• Drift Control
These parameters are set for correcting the drift.
• Set Drift Point
• Clear Oldest Poin
• Enable Correctio
• Drift Ra
• Sampling
Selecting the radio button in the Samplin
If you click on the Sa p
on the Hold radio button, the feedback becomes inactive and the Z scanner voltage
is held at the present Z position.
When observing the image, turn the Sample radio button on. When performing
measurements such as I
the system switches the feedback between on and off automatically.
• Tip Retract at abort
If you click on the Abort button in the SPM Parameters window during scanning,
the scanning stops and the tip immediately returns to the initial position. Therefore,
if the specimen is uneven, the tip is likely to touch it. When the Tip Retract at abort
button is checked, the tip first retracts during scanning, and then returns to the initial
position; then tip retract is cancelled. This prevents damages to the tip and speci-
men.
TMPM5200-2
You can set the reference points for computing the drift speed. You can specify
up to three points.
t
You can erase the oldest of the set reference points.
n
Y ou can select this item if two or more reference points are set. While Enable
Correction is checked, the center point of measurement shifts precisely the
amount of drif t correction each time measurement is performed.
te
The computed drift speed appears. The drift speed is
approximation based on the least squares
m le radio button, the feedback becomes active. If you click
-V and Focus Curve, keep the Sample radio button on, since
Usually, use the instrument keeping Tip Retract at abort off. If you keep it on
when observing the even specimen, the obtained image may become bright or
dark at the beginning of the next scan due to the creep characteristics of the Z
scanner.
５ MEASUREMENT OPERATION
computed by a first order
method.
g frame turns the feedback on or off.
5-221