TRL* and
TRM* Error-Correction
The
HP
8753D
analyzer
has the
capability of
making calibrations
using the
TRL*/LRM* method.
TRL
Error-Correction
1.
Y
ou
must
have
a
TRL
calibration
kit
dened
and
saved
in
the
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USER
KIT
,
as
shown
in
\Modifying
Calibration
Kit Standards
," located
later in
this
section.
2.
Press
4
CAL
5
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CAL
KIT
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SELECT
CAL
KIT
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USER
KIT
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RETURN
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RETURN
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CALIBRATE
MENU
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TRL*/LRM*
2-PORT
.
3. T
o measure
the
\TRL
THRU
,"
connect
the
\zero
length"
transmission
line
between
the
two
test
ports
.
4.
T
o
make
the
necessary
four
measurements
,
press:
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THRU
TRLTHRU
5.
T
o
measure
the
\TRL
SHORT
,"
connect
the
short
to
PORT
1,
and
press:
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S11
REFL:
TRLSHORT
6.
Connect
the
short
to
PORT
2,
and
press:
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S22 REFL:
TRLSHORT
7.
T
o
measure
the
\TRL
LINE,"
disconnect the
short
and
connect
the
TRL
line
from
PORT
1
to
PORT
2.
8.
Press
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LINE/MATCH
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DO
BOTH
FWD+REV
.
9.
The
line
data
is
measured
and
the
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LN/MATCH1
TRLLINE
and
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LN/MATCH2
TRLLINE
softkey
labels
are
underlined.
10.
T
o
measure
the
\ISOLA
TION"
class
,
press:
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ISOLATION
Y
ou
could
choose not
to perform
the isolation
measurement
by
pressing
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OMIT
ISOLATION
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DONE
TRL/LRM
.
Note
You
should perform
the isolation
measurement when
the highest
dynamic
range
is desired.
To perform the best isolation measurements
, you should reduce the system
bandwidth, and/or activate the averaging function.
A poorly measured isolation class can actually degrade the overall
measurement performance
. If you are in doubt
of the isolation measurement
quality, you should omit the isolation portion of
this procedure
.
Note
If loads can be connected to both port 1 and port 2 simultaneously, then the
following measurement can be performed using the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DO BOTH FWD + REV
softkey.
Optimizing Measurement Results 5-23
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