Agilent Technologies E5500 Series Guia do Utilizador Página 131

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Additional Imaging Modes 7
Agilent 5500 SPM User’s Guide 131
6
Choose Controls > Advanced > AC Mode. The EFM Controls
window will open (Figure 88).
Figure 88 EFM Controls window
7 In the Main tab, set up the Lock-in 1 AC signal which drives the
cantilever oscillation:
a Set the Drive% to 10 %.
b Set the Gain to x1 (the amplitude times 1).
8 Choose Controls > AC Mode Tune to open the AC Mode Tune
window.
9 Tune the drive signal to the resonance frequency of the cantilever:
a In the AC Mode Tune window, enter the Start and End
frequencies (in kHz) for the tuning sweep, typically 20-120 kHz.
b Set the Peak Amplitude to 2.5 volts.
c Enter an Off Peak value to offset the oscillation frequency from
the cantilevers resonance frequency. A typical value is
-0.100 kHz.
d Click the Auto Tune button. The system will sweep through the
range of frequencies, locating the peak oscillation amplitude
within the range. The AC signal oscillation will be set to this
value plus the specified Offset.
NOTE
Q Control can be used with EFM Mode to improve the resonance peak
and image quality. See Chapter 6 for more on Q-Control.
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