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Table
6-2.
Binary
Controlled
Counter
Interface
Electronics
Systems
Troubleshooting
(Cont'd)
CAUSE
1.
Misalignment
of
optical
components
2.
Misadjustment
of
10780A
Receiver
gain
3.
Low
power
in
frequency
used
for
measurement
4.
10780A
mal-
function,
cable
intermittent,
or
10760A
mal-
function
-
.
c)
Intermittent
measurement signal
on
one
or
more
measurement
axes
may
indicate:
'Use
laser
power
meter
filtered
for
CHECK
Reduce
beam
size
by
rotating
to
small
aperature
on
laser
head.
Place
alignment
target
on
receiver
lens.
Move
optics
along
entire
measure-
ment
path
and
verify
both
return
beams
over-
lap
on
the
target along
the
entire
length
of
movement.
Monitor
10780A
test
point
on
back
of
receiver,
voltage
should
lie
in
range
0.5-1.OV
dc.
If
volt-
age
>l.lV,
receiver
could
be
saturated.
If
voltage
<.02V,
gain
may
be
too
low.
Use
power
meter,
if
available,
and
polar-
izer
and
check
rela-
tive
power
of
hori-
zontal
and
vertical
polarization.*
Look
at
output
signal
from
10780
and
input
to
10760.
6328
Angstroms
ACTION
If
optics
are
misaligned
and
beams
do
not
overlap,
refer
to
Section
II
for
alignment
procedure.
Refer
to
10780A
manual
for
ad-
justment
pro-
cedure.
Rotate
inter-
ferometer
90
degrees
and
look
for
increase
in
test
point
volt-
age.
Troubleshoot
appropriate
component.
(e.g.
Un~ted
Detector
Technology
#40X meter
(w/filter)
)
*
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Table of Contents
Troubleshooting
