Agilent Technologies 8504B - Page 51

FINAL TRIM SIZE : 7.5 in x 9.0 in
P
erforming
Guided
Setups
and
Calibrations
Matched-length
cables
ensure
response
is
visible
During
calibrations and
subsequent measurements
,
two
cables
must
be
connected
to the
precision reectometer
.
One
cable
connects
the
device
being
measured to
the front-panel
TEST
PORT
.
The
other
cable
connects
the
front-panel
REFERENCE EXTENSION
A and
B connectors
.
The
REFERENCE
EXTENSION
cable must
be equal
in length
(or
slightly
shorter)
than
the
TEST
PORT
cable.
The
relative lengths
of
these
two
cables
determine
the
position
of
the
Fresnel
reection
(from the
end
of
the
TEST
PORT
cable)
on
the
screen.
If
the
REFERENCE
EXTENSION cable
is
too
long
or
too
short,
the
measured
response
may
not be
visible
on
the
screen.
This
is
shown
in
the
following
gure
.
Cable lengths determine response
position.
2-4
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