User`s guide

AC Modes 6
Agilent 5500 SPM User’s Guide 113
well-defined resonant peak in MAC Mode makes the method
particularly effective.
Q Control uses a feedback loop to alter the sharpness of the resonance
peak. It is only available with the MAC III controller, and it can be used
with either AC Mode or MAC Mode.
To use Q Control, select the On check box in the ACAFM Controls
window. Set the Drive%, which is the amplitude of the Q Control
feedback signal, stated as a percentage of maximum. Click the Optimize
button to set the optimal Q-Control Phase and Drive values.
Figure 79 Q Control settings in the ACAFM Controls window