５
MEASUREMENT OPERATION
■
Bias/V
Forw
Specify the bias voltage in this input box. The voltage specified in the Forward input box
is always applied to the specimen. After clicking on the Set button, specify the bias
voltage using the slider. You can specify the bias voltage up to
±
10 V.
Tip Clean
Use his c
and when
you chan
AC-AFM
becomes
dition
Only wh
specified
changes
Enter the
ip Clean box, using the keyboard.
■
Feedback
Set a targ
The feed
reference
ard
ontrol only when you use STM mode in the ultra-high vacuum SPM instrument
you use AC-AFM (FM) mode. While you perform STM observation, when
ge the bias voltage temporarily or slightly touch the tip on the specimen using
(FM), sometimes the tip condition can show improvement and the image
learer. So, this function often serves to improve the tip con
c
ile you are pressing the Clean button, the bias voltage changes to the voltage
in Tip Clean when you use the STM mode and the feedback reference value
to the voltage specified in Tip Clean when you use the AC-AFM (FM) mode.
bias voltage for cleaning the tip in the T
et value (reference value) for the reference signal that is used in the feedback.
back circuit of the SPM controller operates around the set value for the
signal, which differs depending on the measurement mode.
When STM is
Enter the
When AFM is
Enter the
dependin
STM/AF
selected: Current/nA
tunneling current flowing between the tip and the specimen in this input box.
selected: Reference/V
reference voltage in this input box. Be careful that the reference signal differs
g on the AFM mode. The setting voltage range also differs (
Refer to the
M of Scan in Sect. 5.10.3, SPM Parameters).
TMPM5200-2
5-213
