Model
5528A
Flatness Meas
urement
s
9
·6
6.
At
corner"
A", position the Flatness Mirror
wll
h the Angular Interferometer so thai the Angu-
lar Interferometer's two openings are pointed along the diagonal
"AE".
(See Figure
9-6.
)
Make su
re
the
e
dge
of
the
Flatness
Mirror'
s base
is
at the
edge
of the grid, and
do
es not
protrude
into
it.
Turn
the
Flatness Mirror
50
its
"
HP"label
is
facing the Flatness Mirror
in
corner "G".
Thi
s
will
help you align the Opti
cs
later.
7.
Sec
ure
a Straightedge along
the
diagonal,
50
that -
•
it
is
flu
sh with
the
long side of
the
Flatness Mirror
in
co
rner
"A"
,
and-
• it
is
direc
ted
along
the
path you want to measure.
Mark
increment
s on
the
Straightedge corresponding to
the
length of the Footspacer you
have c
ho
sen to use.
8.
Position
the
Angular Reflector with its Footspacer along the Straightedge in such a
way
that
the
two Retrofl
ec
tors
fa
ce
toward
the
Angular Interferometer.
locate
th
e Angular Reflector
50
it
is touching
the
base of
corner
"A
"s
Flatness Mirror and
is
flu
sh with
th
e Straightedge.
9.
Mo
ve
the
small
aperture
into place
on
the
laser Head's
eICit
port.
Mo
ve
the target into pla
ce
over
the
la
s
er
Head's return
port
.
10
. Adjust
the
l aser H
ea
d so
ilS
beam
hits
the
Flatness Mirror
In
corner
"G"
. (See
Fi
gure 9-6. )
It
may
be
helpful to turn
the
mirror 180 degrees, and aim for a spot Just above the "
HP
" logo.
11
. Turn the Flatness Mirror
In
corner
"c"
untillhe
la
ser beam is
in
the
vertical plane passing
through
corner
"A
ils
Flatness Mirror. (The beam itself doesn't have 10
hit
the corner
"A"
Flatness Mirror,
it
jusl has
to
be
vertically
in
line with
It
.)
Again, turn corner "Ails mirror
180
degree
s,
and
aim for
aspol
jusl
above
the
"
HP
" logo.
You may
need
to hold a piece of
paper
In
the beam's path 10 see
where
the
beam
is.
12.
Tilt
the
laser
Head vertically
up
or
down
until the
la
ser beam
is
centered
ju
st above the "HP"
logo of c
orner
"
Ail
s Flatness Mirror. Do
Thi
s by adjusting the knob at
the
rear of the
la
ser
Head (
see
Figure
4-4
for
laser
HeadlTripod
adju
st
ments
).
If
this tilting
ca
uses
the
laser
beam
10
move off of co
rn
er
"G"s
Flatness Mirror, translate Ihe
la
ser Head vertically until
the
beam is again
ce
ntered
on
the mirror, (See Figure 4-4 for an
illustration
of
translation.)
13
.
If
, after s
tep
"
12
".
th
e laser beam
in
co
rner " A"
is
at
the
corred
height. but not centered above
the Flatness Mirror's
"
HP
" label, turn
co
rner "G"sFlatness Mirror slightl
y.
You
should now
ha
ve
alignment
between
the mirro
rs
.
14
. Attach the alignment target to
th
e
An~ul
a
r
Interferometer. (See Figure 8-7
.)
Th
e targel should be allached to
the
Interferometer opening Ihat is dir
eded
toward the
Flatness Mirror. and
in
such a
way
Ihal
Th
e s
mall
(3 mm) hole
is
above the crosshair.
Make sure
th
e larget is
po
sition
ed
as
s
quar
ely
as
possible rela
ti
ve
to
th
e edges of
th
e Optic.
Use
your fingers 10 match edges.
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