HP 8753D - Page 229

Note
The
thru
in
most
calibration
kits
is
dened with
zero length.
The correction
will
not
work
properly
if
a
non-zero
length thru
is used,
unless the
calibration
kit
is
modied
to
change
the
dened
thru to
the length
used. This
is important
for
measurements
of
noninsertable
devices
(devices
having
ports
that
are both
male
or
both
female).
The
modied calibration
kit must
be saved
as the
user
calibration
kit,
and
the
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USER
KIT
must
be
selected
before
the
calibration
is
started.
15.
T
o
measure
the
standard,
when
the
trace
has settled,
press:
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DO
BOTH
FWD+REV
The
analyzer underlines
the
softkey
label
after
it
makes
each
measurement.
16.
Press
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ISOLATION and
select from
the following
two
options:
If
you
will
be
measuring
devices
with
a
dynamic
range
less
than
90
dB,
press:
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OMIT
ISOLATION
If
you
will
be
measuring
devices
with
a
dynamic
range
greater
than
90
dB
,
follow
these
steps:
a.
Connect
impedance-matched
loads
to
PORT
1
and
PORT
2.
Include
the
adapters
that
you
would
include
for
your
device
measurement.
Note
If
you
will
be
measuring
highly
reective
devices
,
such
as lters
,use
the
test
device
,
connected
to
the
reference
plane
and
terminated
with
a
load,
for the
isolation
standard.
b.
Activate
at
least
four
times
more
averages
than
desired
during
the
device
measurement.
Note
If
loads
can
be
connected
to
both
port
1
and
port
2
simultaneously
, then
the
following step
can be
performed using
the
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DO BOTH
FWD +
REV softkey
.
c.
Press
4
CAL
5
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RESUME
CAL
SEQUENCE
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ISOLATION
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FWD
ISOL'N
ISOL'N
STD
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REV
ISOL'N
ISOL'N
STD
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ISOLATION
DONE
.
d. Return
the averaging
to the
original state
of the
measurement, and
press 4
CAL
5
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RESUME CAL SEQUENCE
.
17. T
o compute the error
coecients, press:
NNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNN
DONE 2-PORT CAL
The analyzer displays the corrected measurement trace
. The analyzer also shows the
notation Cor at the left of the screen, indicating that error correction is on.
Note
You can save or store the measurement correction to use for later
measurements. Refer to the \Printing, Plotting, and Saving Measurement
Results" chapter for procedures.
18. This completes the full two-port correction procedure.You can connect and measure your
device under test.
5-22 Optimizing Measurement Results