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Model
5528A
Flatness Measurements
1S.
Turn
corner"
Ails
Flatness
Mi rror
around, so
the laser beam is
in
line
vertically with the small
hole In
the
Angular Interferometer's targe!.
16.
If the laser beam
is
too high
or
too low to
go
through the
target
hole,
translate the laser Head
vertically.
The
beam should
now pass through
the
hole.
17. Remove the target from the
Interferometer.
16. Make sure the Angular
Reflector's Footspacer
is
square
relative to the
Straightedge and
to the
Interferomete
r's
Fla tness Mirror.
look at the
laser Head
and
turn corner
"A"s
Flatness
Mirror until the
ret
urn
beams
are in
line
with
the target
at
the
laser
Head
's
bottom
port. Then
turn
the
laser Head up
or
down to
get
the
beams
to
overlap on the
target. This
es tablishes
the
"nea
r
end of
trave
l".
19.
Attach
the
targets
to the Interferometer
and
the
Reflector,
so
that
-
•
the hole
in
the
Interferometer's
target is
centered on
the
beam, and
-
•
the crosshairs
on
the Reflector's target
are
centered
on the beam. (See Figure
8-8.)
This lime
you don't
have to line up the
edges
of the targets
with the edges of
the
Optics,
(I n
fact
,
you
may
not
be
ab le
to do
so and slill
meet the conditions
above,)
20.
You are
now
ready to
align
the laser to the
Optic's
travel path
.
Turn
to Section
1S
of
Ihis
User's Guide and
follow the instru ctions there
for
"G
unslght"
alignment,
keeping in mind the fo
llowing
-
Too much turning
of
the laser Head may
cause the
laser beam to
move off either of
the
Flatness
Mi
rrors.
If
this
happens
,
start over at
step
"10"
from
your
new Laser Head
position.
21.
You have now
aligned your
laser Measurement
System
along
one pathway of your grid,
Repeat this process
along each
leg
or
diagonal of your
measurement
grid, when
it
is
time to
measure it.
Checking Alignment for Beam Strength
1.
Select
the largest
opening for
the laser Head's
exit and
return port
s.
Remove the
targets
from the
Optics.
2.
Move the Opti
cs
over
their fuillravel
length
while wat ching the BEAM
STRENGTH
meier.
The laser beam is
strong
enough for making
a
measurement as long
as
the BEAM
STRENGTH
need
le stays
in the
green
area
of
the
meter.
If the BEAM
STRENGTH
meter's needle moves into the red area
-
a.
Move the
Optics
to
the
near
end of
travel.
b.
Select the
sma ll
aperture for
the Laser Head's
exit
port,
and
the target
forthe
return
port.
c.
Translate the laser
Head vertically or
turn
corner
"
A"s
Flatness
Mirror to
cause
the return
beams
to
overlap on
the
Lase
r
Head'
s
return port target.
9-9
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