Agilent Technologies 8504B - Page 39

FINAL TRIM SIZE : 7.5 in x 9.0 in
Installing
Cleaning Connections
for
Accurate
Measurements
Dust
Caps
Provided
with
Lightwave
Instruments
Item Part
Number
Laser
shutter
cap
08145-64521
FC/PC
dust
cap
08154-44102
DIN
dust
cap
5040-9364
HMS10/dust cap 08145-44101
ST
dust
cap
1401-0291
Inspecting
Fiber-Optic
Cables
Consistent
measurements
with
your
lightwave
equipment are
a good
indication
that
you
have
good
connections
.
However,
you may
wish
to
know
the
insertion
loss
and/or
return
loss
of
your
lightwave
cables
or
accessories
.If
you
test your
cables and
accessories for
insertion loss
and
return
loss
upon
receipt,
and
retain
the
measured
data
for
comparison,
you
will
be
able
to
tell
in
the
future
if
any
degradation
has
occurred.
Connector
(or
insertion)
loss
is
one
important
performance
characteristic
of
a
lightwave
connector
.
Typical
values
are
less
than
1
dB
of
loss
,
and
sometimes
as
little
as
0.1
dB
of
loss
with
high
performance
connectors
.
Return
loss
is
another
important
factor
.
It
is
a
measure
of
reection:
the
less
reection
the
better
(the
larger
the
return
loss
,
the
smaller
the
reection).
The
best
physically
contacting
connectors
have
return
losses
better
than
50
dB
,
although
30
to
40
dB
is
more
common.
Y
ou
can
visually
inspect
your
cables
Although
it
is
not
necessary,
visual inspection
of ber
ends can
be
helpful.
Contamination
or
imperfections
on
the
cable
end face
can be
detected as
well as
cracks
or
chips
in
the
ber
itself
.
Use
a
microscope
(100X
to
200X magnication)
to inspect
the entire
end face
for
contamination,
raised
metal,
or
dents
in
the
metal
as well
as an
y other
imperfections.
Inspect
the
ber
for
cracks
and
chips.
Visible
imperfections
not touching
the ber
core ma
ynot
aect performance
(unless the
imperfections
keep
the
bers
from
contacting).
1-22
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