Agilent Technologies 8504B - Page 73

FINAL TRIM SIZE : 7.5 in x 9.0 in
P
erforming
Guided
Setups
and
Calibrations
Performing
Manual
Calibrations
To
calibrate
for
an
external
source
1. On
the lightwave
section's
rear
panel,
locate
the
cover
plate
that
is
just
left of
the I.O.
INTERCONNECT
cable
.
2. Turn
the two
thumbscrews
to
remove
the
cover
plate
.
3.
Disconnect
the
green
ber-optic
cable
,
and
put
a
protective
cap
on
it.
4.
Turn
the
external
source
o.
5.
Connect
a
ber-optic
cable
from
your
external
source
to
the
SOURCE
ARM
INPUT
connector
.
6. Turn
the precision
reectometer
on,
and
allow
it
to
warm
up
for
at
least
one hour
.
7. 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.
8.
Connect
one
of
the
cables
between
front-panel
REFERENCE
EXTENSION
connectors
A
and
B
.
9.
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
.
10.
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.
11. Press
4
MENU
5 and then
NNNNNNNNNNNNNNNNNNNNNNNN
NN
EXTERNAL .
2-26
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