Agilent Technologies 4395A - Page 368

Determining
Expected
System
performance
Determining Expected
System performance
The
uncertainty
equations
,
dynamic accuracy
calculations,
and tables
of system
performance
values
provided
in
the
preceding pages
can be
used to
calculate the
expected system
performance
.
The
following
pages explain
how to
determine the
residual errors
of a
particular
system
and
combine
them
to obtain
total error-corrected
residual uncertainty
values,
using
worksheets
provided.
The
uncertainty
graphs at
the beginning
of this
System performance
section
are
examples
of
the results
that can
be calculated
using this
information.
Procedures
T
able
11-9
is
a
worksheet
used
to
calculate
the
residual
uncertainty
in
reection
measurements
.
T
able
11-10
is
a
worksheet
for
residual
uncertainty
in
transmission
measurements
.
Determine
the
linear
values
of
the
residual
error
terms
and
the
nominal
linear
S-parameter
data
of
the
device
under
test
as
described
below
and
enter
these
values
in
the
worksheets
.
Then
use
the
instructions
and
equations
in
the
worksheets
to
combine
the
residual
errors
for
total
system
uncertainty
performance
.
S-parameter
V
alues
.
Convert
the
S-parameters
of
the
test
device
to
their
absolute
linear
terms
.
Noise
Floor
.
See
the
R
eceiver
Noise
Level
P
erformance
T
est
in the
Service Manual
to
determine
the
actual
noise
oor
performance
of
your
measurement
setup
.
Crosstalk
.
See
the
Input
Crosstalk
P
erformance
T
est
.
Connect
an
impedance-matched
load
to
each
of
the
test
ports
and
measure
S
21
or
S
12
after
calibration.
Turn
on
the
marker
statistics
function,
and
measure
the
mean
value
of
the
trace
.
Use
the
mean
value
plus
one
standard
deviation
as
the
residual
crosstalk
value
of
your
system.
Dynamic
A
ccuracy
.
Determine
the
absolute
linear
magnitude
dynamic
accuracy as
described
under
Dynamic
A
ccuracy
In
this
chapter
.
Other
Error
T
erms
.
See
T
able
11-3
through T
able 11-8
, depending
on
the
test
set
and
connector
type
in
your
system.
Find
the
absolute
linear
magnitude
of
the remaining
error
terms
.
Combining
Error T
erms .
Combine the
above terms
using
the
reection
or
transmission
uncertainty
equation
in
the worksheets
.
11-52 Specications and Supplemental Characteristics