５
MEASUREMENT OPERATION
TMPM5200-2
5-141
■
Cautions in observing image
In the STM mode, the settings of bias voltage and current are important points.
Unless the settings are carried out correctly, not only will it be impossible to obtain a
satisfactory image, but also you may damage the specimen or the cantilever tip.
Control the distance between the specimen and the tip by adjusting Bias/V and
Current/nA. If you set Bias/V to a small value and Current/nA to a large value, the
distance between the specimen and the tip will be small. Theoretically, the resolution
will increase, but the tip will be more liable to strike the specimen.
You can visually check the distance between the specimen and the tip at Z Piezo Position,
which is in gray during scanning. So do it before starting to scan.
Condition i
n which the specimen and cantilever tip are completely separated
(condition prior to approach)
Neutral position (condition at the end of approach)
Co
lever tip have fully struck each other
■
the Start button.
ndition in which the specimen and canti
Terminating observation
Terminate observation according to the following procedure.
1.
Stop scanning.
2.
Click on the
Retract On
button to retract the cantilever tip.
3.
Click on the Out button for Z and click on
