Agilent Technologies 8504B - Page 70

FINAL TRIM SIZE : 7.5 in x 9.0 in
P
erforming
Guided
Setups
and
Calibrations
Performing
Manual
Calibrations
To
balance
the
receiver
1. Turn
the precision
reectometer
on,
and
allow
it
to
warm
up
for
at
least
one hour
.
2. Locate
two ber-optic
cables
that
are
of
equal
length.
If
you
plan
to
measure
a
device
that
has
a
pigtail,
the
cables
must
be
equal
to
(or
up
to
240
mm
shorter
than)
the
length
of
the
pigtail.
3.
Connect
one
of
the
cables
between
front-panel
REFERENCE
EXTENSION
connectors
A and
B
.
4. If
you plan
to
measure
a
device
that
does
not
have
a
pigtail,
connect
a
low-reection termination
to TEST
PORT
using
the
remaining
ber-optic
cable.
5. If
you plan
to
measure
a
device
that
has
a
pigtail,
connect
a
low-reection
termination
directly
to
the
TEST
PORT
.
N
O
T
E
Do
not
move
the
reference
extension
cable
for
the
rest
of
this
procedure
.
An
y movement
of
this
cable
will
change
the
reference
signal
polarization
and
will
invalidate
the
calibration.
6. Press
4
CAL
5 and
then
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CALIBRATE MENU
.
7.
Press
N
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BALANCE
RECEIVER
.
8.
A
djust
the
two
polarization
balance
knobs
until
the
line is
in
the
shaded
area.
2-23
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