Agilent Technologies 4395A - Page 344

Typical
System
P
erformance
System P
erformance at
Network Measurement
Typical
System
P
erformance
Introduction
The
performance
of
the
4395A
Network/Spectrum
Analyzer
(analyzer)
depends
not
only
on
the
performance
of
the
analyzer
but
also
on
the
conguration,
the
user-selected
operating
conditions
,
and
the
measurement
calibration.
This
section
explains
the
residual
errors
remaining
in
a
measurement
system
after
accuracy
enhancement.
It
provides
information
to
calculate
the
total
measurement
uncertainty
of
dierent
congurations
.
Graphs
at
the
beginning
of
the
section
show
examples
of
the
performance
that
can
be
calculated
using
the
methods
in
this
section.
The
sources
of
measurement
errors
are
explained,
with
an
error
model
owgraph
and
uncertainty
equations
.
Information
is
provided
for
conversion
of
the
dynamic
accuracy
error
(in
dB)
to
a
linear
value
for
use
in
the
uncertainty
equations
.
The
eects
of
temperature
drift
on
measurement
uncertainty
are
illustrated
with
graphs
.
Typical
system
performance
tables
are
provided
for
an
7
mm
and
3.5mm systems
using an
85046A
test
set,
for
50

type-N
systems
using
the
85046A
and 87512A
test sets
,
and
75

type-N
systems
using
the
85046B
and
87512B
test
sets
.
Procedure
and
blank
worksheets
are
supplied
to
compute
the
total
error-corrected
measurement
uncertainty
of
a
system.
These
procedures combine
the
terms
in
the
tables
,
the
uncertainty
equation,
and
the
nominal
S-parameter
data
of the
device
under
test.
Comparison
of
Typical
Error-Corrected
Measurement
Uncertainty
Figure
11-15
through
Figure
11-22
are
examples
of
the
measurement
uncertainty
data
that
can
be
calculated
using
the
information
provided
in
this
section.
These
gures
compare the
reection
and
transmission
measurement
uncertainty
of
a
7
mm
system
using
dierent
levels
of
error
correction.
Each
gure
shows
uncorrected
values and
residual uncertainty
values after
response
calibration,
response
and
isolation
calibration,
and full
one or
two port
calibration.
The
data
applies
to
a
frequency
range of
300 kHz
to 500
MHz with
a
stable
temperature
(no
temperature
drift),
using
compatible
7mm
calibration devices
from the
85031B calibration
kit.
The
results
shown
in
Figure 11-15
through
Figure
11-22
can
be
obtained
using
the
85046A
.
Dierent measurement calibration procedures provide comparable measurement improvement
for the following compatible connector types and test sets (using the compatible calibration
kits):
3.5 mm connectors
87511A and 87511A
with 50  type-N connectors
87511B and 87511B with
75  type-N connectors
11-28 Specications and Supplemental Characteristics