3
W
arning
Do
not
look
into
the
end
of
an
optical
cable
attached
to
a
laser
output
when
the
device
is
operational.
Note
Do
not
disconnect
the
ber
from
the
source
when
making
a
loss
measurement.
A
small
change
in
the
coupling
at
the
source
can
introduce
large
errors
into
your
measurement.
Once
you
have
taken
the
reference
,
you
can
place
the
device
under
test
into
the
system.
Figure
3-2.
Measuring
the
Loss
of
a
Device
Under
T
est
(DUT)
Do
not
stop
and
restart
the
application
as
you
insert
and
change
devices
under
test.
Every
time
you
start
the
application,
the
instrument
takes
a
new
reference
.
Y
ou
can
switch
the
source
o
and
on
without
disturbing
the
reference
value
.
Do
this
to
avoid
exposure
to
laser
radiation
when
you
are
changing
the
device
under
test.
While
the
application
is
running,
the
result
eld
shows
the
loss
,
in
dB
,
and
the
character
eld
shows
the
reference
,
in
dBm.
1
indicates
the
result
eld
and
2
indicates
the
character
eld
in
Figure
3-3.
If
you
are
using
both
wavelengths
of
a
dual
wavelength
source
,
the
loss
and
reference
for
both
wavelengths
are
displayed.
The
loss
and
reference
for
the
lower
wavelength
is
shown
on
the
left.
The
loss
and
reference
for
the
higher
wavelength
is
shown
on
the
right.
3-4
Local
Control
-
Menu
Mode
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