Ch. 18. Laser Sources Sec. 18.3. ’Spot On’ calibration
position shifts in the relationship of the optical components, the light may settle in a new location. Once
the light tube is installed and any corrections are made to the calibration, the spot accuracy of the “Spot
On” routine is very repeatable. If the “Spot On” software routine appears to misalign the light on the
back of the cantilever, it may be for the following reasons:
• The light tube you installed may be clamped in a different position from when it was tested at the
factory. With the light tube powered on, loosen and jiggle the light tube to allow it to re-seat in the
head. Re-tighten the clamp. If the light moves back to the same (unwanted) location repeatedly
then consider recalibration.
• If the light tube was purchased at a later time from when the system was delivered or it was
exchanged due to a repair then the “spot on” parameters were calibrated on a different Cypher
and small system to system differences make the spot on calibration parameters in the light tube
incorrect for your system.
18.3.1. Readjusting the ’Spot On’ calibration.
The spot on software routine relies on two parameters stored in the Light Tube calibration information
block (info block). These parameters are set at the factory but may need to be changed if the light tube
is exchanged.
If you find that the Spot On position is still off after re-seating the light tube and allowing it to warm up:
1. Allow the light tube to come to operating temperature. Subtle changes in the relative position
of the optical emitter and focusing lenses inside the light tube can occur during warm up after
installation. Allow an hour for the light tube to come to thermal equilibrium with the system. You
may find that the error in the “Spot On” positioning will reduce. If the Cypher is left powered off
for an extended amount of time, i.e. overnight or for a day, you may find that the Spot On position
may be off. Allow ample time for the system to reach thermal equilibrium before deciding to
make adjustments
BETA
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