Agilent Technologies 4395A - Page 189

Calibration
Required
for
the Network
Analyzer Mode
Step
3: Measuring
the Transmission
1.
Press
N
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TRANSMISSION .
2.
Connect
a
THRU
connection
between
port
1
and
port
2
at the
points where
the test
device is
connected.
3.
When
the
trace
settles
,
press
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FWD.
TRANS.
THRU
.
Then
wait
the
S21
frequency
response
is
measured and
the softkey
label is
underlined.
4.
Press
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FWD.
MATCH THRU
. Then
wait the
S11 load
match
is
measured
and
the
softkey
label
is
underlined.
5.
Press
N
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REV.
TRANS.
THRU
.
Then
wait the
S12 frequency
response is
measured and
the
softkey
label
is
underlined.
6.
Press
N
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REV.
MATCH THRU
.
Then
wait
the
S22
load
match
is
measured
and
the
softkey
label
is
underlined.
7.
Press
N
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TRANS.
DONE .
The
transmission
coecients
are
computed
and
stored.
The
two-port
calibration
menu
is
displayed
(with
the
N
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TRANSMISSION
softkey
underlined).
Step
4:
Measuring
the
Isolation
1.
If
correction
for
isolation
is
not
required,
press
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N
ISOLATION
N
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N
OMIT
ISOLATION
N
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NN
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ISOLATION
DONE
.
Then
skip
to
step
5.
2.
If
correction
for
isolation
is
required,
connect
impedance-matched
LO
ADs
to
port
1
and
port
2.
3.
Press
N
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N
FWD
ISOL'N
ISOL'N
STD
.
Then
wait
the
S21
isolation
is
measured
and
the
softkey
label
is
underlined.
4.
Press
N
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NN
REV
ISOL'N
ISOL'N
STD
.
Then
wait
the
S12
isolation is
measured and
the
softkey
label is
underlined.
5. Press
N
N
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N
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ISOLATION DONE
.
The
isolation
error
coecients
are
stored.
The
two-port
calibration
menu
is
displayed
(with
the
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
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N
N
N
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N
ISOLATION
softkey
underlined).
Step
5: Completing
the Calibration
1.
Press
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DONE: 2-PORT CAL
to complete the calibration.
The error coecients are
computed and stored. The correction menu is displayed (with
NNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNN
CORRECTION ON off
). A corrected trace is
displayed. The notation \
C2 " at the left of the
screen indicates that two-port error correction is
ON.
Now the test device can be connected and measured. Save the calibration data on the built-in
disk drive
.
Calibration 7-7