TMPM5200-2
5-61
excitation frequency of the cantilever
requency/kHz window using the keyboard.
ance, using the VCO
F
s to obtain close to 70% of the maximum output
voltage at the Peak Frequency value obtained in the frequency sweep.
For example, if the following data is obtained, set the RMS Value to 8.0 V
×
0.7 =
higher value. If
To set the
1.
Click on the Set button for Frequency/KHz in the Cantilever Tuning window.
The VCO Frequency/kHz window will appear.
2.
Enter the frequency displayed in Peak Frequency/KHz in the input box in the
VCO F
3.
Adjust the frequency toward the higher frequency allow
requency/kHz window, so a
5.6 V, and shift the frequency from the peak value to a slightly
instead you set the frequency toward the lower frequency reading, shift the fre-
quency from the peak value to a slightly lower value.
V
8.0 V
5.6 V
300
290
Peak Frequency
f
30 kHz
Click the mouse
button here.
290.0
500 k
Hz
Click on the increase button (arrow mark to the right) while watching the RMS
Value until it reaches –5.6 V; then click on the OK button to close the VCO Fre-
quency /kHz window.
■
Cantilever manual tuning (FMD)
This section presents the procedure for manually tuning the cantilever. The procedure is
useful when you are unable to tune the cantilever automatically.
Cantilever characteristic frequency peak search
You can check the cantilever resonance frequency for the FM detection method and
specify the center frequency for the FM detection method by doing the following:
1.
Click on the
button in the STM/AFM selection box in the Scan frame in
the Advanced tab window; then select FM from the pull-down menu.
2.
Click on the Cantilever button at the lower right in the Advanced tab window.
The Cantilever Tuning window opens.
3.
Click on the FM tab to open the FM tab window; then type 0.1 in the Output
Amp/V input box.
