Revised 03/25/2020
9
3.)
Gun Shift
a.)
Select “
Gun Shift
” from the “Direct Alignments” panel.
b.)
Set the “
Spot size
” to
9
.
c.)
Converge the beam
to crossover using the “Intensity” (LC) knob and
center
the beam using the
beam shift trackball
(LC)
Note: if the beam moves significantly when changing the intensity, roughly
center the condenser aperture (see step 4.) before proceeding.
d.)
Set the “
Spot Size
” to
3
.
e.)
Converge the beam
to crossover and
center
the beam using the
gun shift
(MF knobs)
.
f.) Repeat steps b
–e until the
beam does not move
when changing between
spot sizes 3 and 9
.
g.)
Press “
Done
” in “Direct Alignments”.
h.) If the gun shift must be adjusted a substantial amount and it results in a
significant change in the measured exposure time at a given spot size, re-
check the gun tilt alignment.
4.)
Centering the Condenser Aperture
a.)
Select
the desired
condenser
aperture
(4 is largest; 1 is
smallest) using the large, outer
knob on the aperture.
b.)
Converge
the beam to crossover
(LC “Intensity”) and
center
the
beam using the
beam shift
trackball
(LC).
c.)
Spread
the beam (“Intensity”
clockwise from crossover) and
center
the illuminated area using
the
X and Y knobs on the
aperture
(not MF knobs)
d.) Repeat steps b and c until the beam spreads evenly across the screen.
Aperture selection
X and Y alignments
Insert/remove
aperture
