Agilent Technologies 8504B - Page 72

FINAL TRIM SIZE : 7.5 in x 9.0 in
P
erforming
Guided
Setups
and
Calibrations
Performing
Manual
Calibrations
To
calibrate
the
magnitude
Always balance
the receiver
before
calibrating
the
magnitude
.
Balancing
the
receiver ensures
that the
displayed
response
magnitude
is
insensitive
to
the
polarization transformations
of the
ber
in
the
test
arm
when
the
return
loss
of
the
device
being
tested
is
polarization-independent.
1.
Calibrate
the
reference
balance
as
described
in
\T
o
balance
the
receiver".
2.
If
you
plan
to
measure
a
device
that
has
a
pigtail,
connect
a
ber-optic
cable
to
the
TEST
PORT
.
This
cable
must
be
equal
to
the
length
of
the
cable
that
is
attached
to
the REFERENCE
EXTENSION connectors
.
3. Press
4
CAL
5 and
then
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CALIBRATE MENU
.
4.
Press
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CALIBRATE
MAGNITUDE
.
5.
Select
a
standard:

Press
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NN
N
FRESNEL
to
select
the
standard
default
value
.

Press
N
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N
USER
STD
to
use
your
own
standard.
Enter
the reection
return
loss
(in dB)
of
your
standard.
The
sweep
can
be
at
any
position.
The
Fresnel
value
listed
is
the
percentage
of
reectance
of
the
open
end
of
the
ber-optic
cable
.
6.
W
ait
until
the
asterisk
on
the
display's
left-hand
side
disappears
and
the
letter
C
remains
below
the
asterisk.
Y
ou
should
see
a
Fresnel
response
on
the display
due to
a reection
from
the
end
of
the
TEST
PORT
cable
.
2-25
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