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FINAL
TRIM
SIZE
:
7.5
in
x
9.0
in
P
erforming
Guided
Setups
and
Calibrations
P
erforming
Manual
Calibrations
The
values
listed
above
are
derived
from
the
following
formulas:
015
dB
=
10
Log
0: 0316
014: 7
dB
=
10
Log
0: 0337
Y
ou
can
direct
the
precision
reectometer
to
use
your
own
calibration-
standard
values
during
a
magnitude
calibration.
Using
your
own
optical
device
of
known
reectance
for
a
standard
can
improve
dynamic
accuracy
.
Ensuring
accuracy
of
low-level
reections
When
observing
reections
at
low
levels
,
perform
the
balance
receiver
calibration
periodically
after
a
full
calibration
to
ensure
better
accuracy
.
P
eriodically
balancing
the
receiver
helps
to
remove
small
\drifts"
when
displaying
very
small
signals
.
This
drifting
occurs
most
often
when
the
instrument
is
not
allowed
to
temperature
stabilize
for
at
least
one
hour
prior
to
use
.
P
olarization
balance
calibration:
the
inside
story
The
receiver
contains
a
polarization
splitter
that
splits
an
y
incoming
light
into
two
orthogonal
polarizations.
(Refer
to
\Block
Diagram
"
in
Chapter
5
for
a
block
diagram
of
the
instrument.)
A
photodiode
mixes
the
optical
elds
reected
from
the
two
arms
of
the
interferometer
and
generates
the
interference
signal
in
each
polarization.
T
o
ensure
proper
operation
of
the
receiver
,
the
reference
arm
reections
needs
to
be
about
equally
split
between
the
two
polarizations.
The
balance
receiver
calibration
ensures
that
this
condition
is
met.
During
balance
receiver
calibration,
the
TEST
PORT
cable
is
terminated
with
a
low
reection
termination.
This
means
substantially
that
the
only
light
that
hits
both
receiver
detector
diodes
is
from
the
mirror
in
the
reference
light
path.
The
polarization
of
this
light
is
then
adjusted
b
y
the
front
panel
reference
polarization
balance
knobs
such
that
the
responses
from
each
detector
are
equal,
or
balanced.
Subsequent
measurements
of
polarization-independent
return
loss
are
then
insensitive
to
polarization
transformations
of
the
ber
in
the
test
arm.
2-21
Содержание 8504B
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