Model
5528A
Square
ness
Measurements (
In
A
Hori
zontal Plane)
12-10
1
3.
Re-
sec
ure
the
Opti
ca
l
Sq
uare
as
se
mbly to the
ma
chin
e,
if
yo
u had
to
move it in step "
12
".
14.
You are
now
ready to align
the
la
se
r
to
the Interferometer
's
or Optical Square's navel.
Review the "GUNSI
GHT"
method
of
alignment in Section
15
of this User's Guide.
Your goal
is
to adjust
the
l
ase
r Head to tra
ck
the Optic's progression along the tra
ve
l path,
while
maintaining the beam's near-end-
of
-travel position. You will do this
by
-
• Keeping the beam in
the
sm
all hole on the Interferometer target, to maintain the
beam's near-end-
of
-travel
po
sition, and -
• Keeping a
two-d
ot
pattern
in
line
with the line
at
Ihe
center
of
the Optical Square's
slot, and symmetrical
about
115
opening, to match the
Opti
c's travel.
This
will
be a
little
different
than aligning for Distance and Angul
ar
mea
surements,
since with these alignments you were
only watching one
dot
relative to a
ta
rget
crosshair.
15.
Move
the Optics
to
the far
end
of
travel.
Be
s
ur
e the target
is
in place on the Interferometer
and the
small aperture
is
se
lected
for
the laser Head's exit port.
16
. Rotate the laser Head, vertically and horizontally, to keep the
Iwo
dots lined
up
on the
sc
ribed
line
al
the ce
nler
of
the
Opti
cal Square's slot. and symmetrical about
its
opening
(s
ee
Figure 12-6).
Sin
ce
the
dot
s
will
move apart
as
the
Optics move, you may have to
hold
a card on each side
of
the
Opti
ca
l Square's sl
ot
to
follow
their
movement.
17
. Translate the laser Head,
hori
zontally and vertically, to keep the beam from being
dipped
by
the
small
hole
in
the
Interfe
r
ometer
target.
Any translation
of
the laser '-lead
will
cause the
two
dOls to move
from
their position on the
Opti
cal Square,
so
you
will
again have to rOlate and translate the l
aser
Head (i.e., repeat
step
"
16"
and s
lep
" 1
7"
) several li
mes
before you are finished.
You are finished with
thi
s
pro
c
edure
when
the beam
goes
th rough the Interferometer target
and
the
two
dots are symmetrical
about
the Optical Square's slot and in line with the scribed
line
at
the center
of
the slot. (
See
Figure 1
2-6.)
Figure
12
-6. Two Dots on the
Optical
Square
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