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Model
5528A
Squareness
Measurements
(In
a Vertical
Plane)
~
I
II!!
!!llI
-
I
Figure
13-8.
I"itial Positioning
o(
Oplica
l
Square
19.
You
are now
ready to align the
laser to the
In terferometer
's
travel path
.
Review
the
"
CUNSICHT"
method
of
alignment in
Section 15
of
this
User's Guide
.
Your
goal
is 10 adjust
th
e laser
Head
to
Ha
ck
the
Int
erferome ter 's travel
path
, w hile
maintaining
Ihe
beam's nea
r-end -of -travel
posi
tion
.
You
will do thi
s
by:
•
Keeping
the
beam
in
the
alignment
ring
o
n
the
Relroreflector,
to
maintain th
e
beam's
near-end-of-travel
position,
and
-
•
Keeping a
two-d ot
pattern in
line
wi
th the
ce
nt er
of the
Optical Square's
slot
ast he
Optics move
over
Ihe
tra
vel
path
.
This
will be a
little
different
than aligning for
Distance and Angular measuremen
ts,
since
with
these
alig nments
you
were
on ly
watching
one
dot
relative to
a
target
crosshair.
20.
Move
the
Optic;
10
the
far end
of travel.
21.
Rotate
the
la
ser
I-lead
vertica
ll
y
and
ho
ri
zon
tall
y
to
keep
th
e
two
dots
lined
up
o
n th
e scri
bed
line
at
the
cen ter of
the
Optical Square'sslol
,
and
symmetrica
l about
the
slot. (See Figure
13-
9.1
Si nce
the dot
s
will
move
aparl as the Optics
move,
you
may have to
insert
a piece
of
paper
o
n
lOp
of the Optica
l
Square
to wa
tch
the
dots
over the (uJitravel
distance.
13-13
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