User`s guide

Preparing for Imaging 4
Agilent 5500 SPM User’s Guide 81
The Friction signal is the difference between the left and right halves
divided by the Sum.
Figure 56 Laser Alignment window in PicoView
2 Use the knobs on the detector to move the laser spot to the center of
the four quadrants. The front (deflection) knob moves the spot up
(clockwise) or down (counterclockwise). The left (friction) knob
moves the spot to the left (clockwise) or to the right
(counterclockwise).
NOTE
These signals can also be seen on the Head Electronics Box where Meter
A is the Sum signal reading and Meter B shows Deflection and Friction
(LFM) depending on the state of the switch directly below the meter.