５
MEASUREMENT OPERATION
5-174
TMPM5200-2
■
Cantilever Autotune Setup
This displays the Cantilever Autotune Setup dialog in which you carry out the basic
settings for the automatic adjustment of the cantilever resonance point in the AC and
AFM measurement modes.
AC Mode Setting
When you select
AC
under the AFM Mode on the upper right of the dialog, AFM Mode
changes to AC mode.
•
Excitation Voltage
In the automatic adjustment sequence, the software scans the frequency to search
for the resonance point of the cantilever, and sets the excitation voltage of the
cantilever at the resonance point. If the amplitude signal (RMS signal) scales over
the limit range, decrease the setting voltage.
•
Amplitude Setup
In the automatic adjustment sequence, after searching the resonance point of the
cantilever, the software adjusts the RMS signal to about 8 V once, maintaining the
resonance frequency.
Since the AC mode utilizes the tilt of the resonance wave of the cantilever (the
amplitude decreased by the force that the cantilever receives), set the amount of
decrease that shifts the frequency from the resonance until the amplitude decreases
by some amount from the resonance amplitude. You can set a value from 100% to
50 %. If you set the value to 100 %, measurement is performed at the resonance
frequency; if you set the value to 50 %, measurement is performed at a frequency
shifted from the resonance until the amplitude is decreased to 50 % from that of the
cantilever resonance.
