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Model
5528A
Flatness
Measurements
9·6
6.
At
corner"
A", position the Flatness Mirror
wllh
the Angular Interferometer
so
thai the
Angu-
lar Interferometer's two
openings
are pointed along the diagonal
"AE".
(See
Figure 9-6.
)
Make
sure the edge
of
the
Flatness
Mirror's
base is at
the edge
of
the
grid,
and
does
not
protrude into it.
Turn the
Flatness
Mirror
50
its
"
HP"label
is
facing the Flatn
ess
Mirror in corner
"G". This
will
help
you
align
the
Opti
cs
later
.
7.
Secure
a Straightedge along the
diagonal
,
50
that
-
•
it
is
flu sh
with the
long
side
of the
Flatness
Mirror
in
corner
"A",
and-
•
it
is directed
along
the path
you want
to
measure.
Mark
increments o
n the
Straightedge
corresponding to
the length of
the
Footspacer you
have
chosen to
use.
8.
Position the Angular Reflector with its
Footspacer
along
the
Straightedge
in such
a way
that
the two Retroflectors fa
ce
toward
the
Angular
Interfero meter.
locate
th
e
Angular
Reflector
50
it
is
tou ching the
base
of
corner
" A"s
Flatness
Mirror and
is
flu sh
with
th
e
Straightedge.
9.
Move
the
small aperture
into
place
on
the
laser
Head's
eICit port.
Move
the target
into
place
over
the laser
Head's
return
port.
10.
Adjust
the l
ase
r Head
so
ilS
beam
hits
the
Flatness
Mirror In corner
"G".
(See Figure
9-6.
)
It
may be helpful to turn the mirror 180
degrees,
and aim for
a spot Just
above the
" HP" logo.
11
.
Turn th
e Flatness
Mirror
In corner
"c
"
untillhe laser beam
is
in the
vertical
plane passing
through
corner
" Ails
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
corne
r
"Ails
mirror
180
degrees,
and aim
fo
r
aspol
jusl
above the
" HP" logo.
Yo
u 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 laser beam is
centered
just
above
the
"HP"
lo
go of corner
" Ails
Flatness
Mirror.
Do
This by
adjusting the knob at
the
rear
of
the
laser
He
ad
(see
Figure
4-4
for
laser HeadlTripod
adjustments).
If this tilting
ca
uses the
laser
beam
10
move
off of
corn er
"G"s Flatness
Mirror,
translate Ihe
lase
r Head
vertically
until
the
beam
is
again
centered
on
the
mirror,
(See
Figure 4-4 for an
illustration of translation
.)
13. If,
after step
"12". the
laser beam in corner
" A"
is
at the
corred
height.
but not centered
above
the
Flatness Mirror's " HP"
label
,
turn
corne
r
"G"sFlatness
Mirror
slightly.
You should now
have
alignment
between
the mirro rs.
14.
Attach
the
alignment
target
to
the
An~ul
a
r
Interferometer. (See
Figure
8-7.)
The
targel
sho
uld be
allached
to
the
Interfero
meter
open
ing Ihat
is direded
toward the
Flatness Mirror. and in
such
a way
Ihal
The
small
(3
mm
)
hole is above the
crosshair.
Make
sure the
larget
is
positioned as square ly
as possible
rela tive
to
the
edges
of
the
Optic.
Use
your
fingers
10
mat ch
edges.
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