Model
5528A
Flatness
Measurements
1
S.
Turn
corner"
Ails Flatness
Mi
r
ror
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
Interferometer
's
Fla
t
ness
Mirror.
look
at
the
laser
Head and
turn
co
rner
"A"s
Flatness
Mirror
until
the return 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
travel
".
19
. Attach the targets
to
the Interferometer and the Reflec
tor
,
so
that -
• the hole in the
Interferometer'
s target
is
centered on the beam, and -
• the crosshairs on the Reflector's target are ce
ntered
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
no
t be
ab
le to
do
so
and
slill
meet the c
onditions
above
,)
20.
You
are now ready to align the laser to the
Optic's
travel path.
Turn to Section
1S
of
Ihi
s User's
Guide
and
follow
the instructions there
for
"G
unslght"
alignment, keeping in
mind
the fo ll
owing
-
Too much
turning
of
the laser Head may cause the laser beam
to
move
off
either
of
the
Flatne
ss
Mi
rrors. If this happens, start
over
at
step
"10"
from
your
new
Laser
Head
position.
21.
You have
now
aligned
your
laser
Mea
s
urement
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
Be
am 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
l
ength
while
watc
hing
the BEAM STRENGTH
meier
.
The laser beam
is
strong enough for
making
a measurement
as
long
as
the BEAM STRENGTH
needle
stays
in the green area
of
the
me
ter.
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 s
ma
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
Flatne
ss
Mirror
to cause the
return
beams
to
overlap on the
La
se
r Head's
return
port
target.
9-9
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