User`s guide

MAC III Mode 11
Agilent 5500 SPM User’s Guide 175
Amplitude Displays the amplitude, in volts, of cantilever
lateral oscillation amplitude.
Drive (%) The amplitude of the lock-in drive signal, stated as
a percentage (0-100 %) of the maximum available
10 V.
Frequency (kHz) Displays the frequency of the lock-in signal. From
the AC Mode Tune window you will be able to
sweep the frequency of Lock-in 1, to determine the
frequency at which the lateral tip deflection is
maximized (i.e., the resonant frequency).
Gain Multiplies the output of the lock-in by the selected
factor. Use a larger multiplier to improve the
signal-to-noise ratio for a small signal. Ensure that
the gain will not result in an amplitude exceeding
10 V, beyond which the signal will be clipped. The
default value is x1 (the amplitude times 1).
Zero Phase Sets the phase at the current frequency to zero,
making it easier to interpret phase changes from
the current value.
Q Control On By applying a phase-shifted version of the
cantilever drive signal on top of the drive signal, Q
control can either increase or decrease the effective
quality factor of the system. Select this box to
enable the Q Control feedback loop. By default, Q
Control is turned Off.
Drive (%) Sets the amplitude of the Q Control phase-shifted
signal, stated as a percentage (0-100 %) of the
maximum available.
Optimize Sets the optimal Q-Control Phase Shift and Drive.
Amplitude 1 and Phase 1 are routed to the Aux 1 and Aux 2 outputs,
respectively. These signals can be viewed by selecting Aux 1 or Aux 2
from the drop-down list in the Realtime Images window.
FMM
In Force Modulation Mode, Lock-in 1 provides the oscillating signal
driving the cantilever. Constant cantilever deflection is maintained by
feeding back Deflection to the Input of Lock-in 1. The amplitude of