User`s guide
MAC III Mode 11
Agilent 5500 SPM User’s Guide 183
AC Mode window includes several tabs, each of which is described
below.
Lock-In Tabs
Each of the three lock-ins includes its own tab with the following
Settings:
Figure 122 Advanced AC Mode Controls window: Lock-in tab
Amplitude Displays the amplitude, in volts, of whatever
is being driven by the lock-in drive. For
example, if the lock-in is driving the
cantilever, the oscillation amplitude (as
measured by the photo detector) is reported.
Drive (%) The amplitude of the Lock-in 1 drive signal,
stated as a percentage (0-100 %) of the
maximum available 10 V.
Frequency (kHz) Displays the frequency of the Lock-in 1
signal. From the AC Mode Tune window
you can sweep the frequency of Lock-in 1,
to determine the frequency at which the tip
oscillation 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