Precision II Operation and Maintenance Manual C
5-22
996-0255 rev. b
7) Replace the second amplifier head.
8) With the horizontal adjustment screws, align the rod so
that it is centered on the HeNe beam. To translate the
head use both screws. For angular adjustment use screw
#2. When moving the assembly away from the edge of the
bench, the base plate may need some assistance. Use a
balldriver or a screwdriver to lever the assembly over.
9) For vertical adjustment, use screws A, B and C. Screws A
and B should be adjusted equally to avoid any rotation of
the rod. Adjust all theree screws evenly to raise the head.
Adjust C for tilt.
10) Tighten all 9 locking screws. Confirm that the head is still
aligned. If not, you may need to shift the head to compen-
sate for any movement that occurs while locking.
11) Replace first amplifier and repeat steps 8 through 10 with
this head.
12) Remove HeNe, alignment mirrors and fixtures.
NOTE:
The burn pattern should be a sharply defined dark
brown circle. Within the circle there should be another
round image that is slightly smaller then the dark brown
one. This smaller image will be a lighter color which
indicates higher energy. When the the beam is perfectly
aligned through the aperture the light brown image will
be centered on the dark one.
Determine if the oscillator beam is well aligned through
the aperture. If the light brown image is not centered on
the dark brown circle then adjustments will have to be
made.
I. Precision II Dual amplifier IR alignment
1) Keep amplifier PU off. Attenuate the oscillator by either
lowering the pump voltage or delaying off the Q-switch.
2) Slide mirror 7c until beam is centered entering the tele-
scope. Adjust angle so the beam is parallel to the end of
the bench. See diagram, page 5-20.
3) Replace the two pinhole alignment fixtures back in the
dowel pin locations before the first amplifier and after the
second amplifier.
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