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Calibration
for
Network
Measurement
Figure
A
-38.
Load
Match
E
LF
The
measured
value
,
S
21M
,
consists
of
signal
components
that
vary
as
a
function
of
the
relationship
between
E
SF
and
S
11A
as
well
as
ELF
and
S
22A
,
so
the
input
and
output
reection
coecients
of
the
test
device
must
be
measured
and
stored
for
use
in
the
S
21A
error
correction
computation.
Thus
,
the
test
setup
is
calibrated
as
described
above
for
the
reection
to
establish
the
directivity
,
E
DF
,
source
match,
E
SF
,
and
reection
frequency
response
,
E
RF
,
terms
for
the
reection
measurements
.
Now
,
that
a
calibrated
port
is
available
for
reection
measurements
,
the
THRU
is
connected
and
load
match,
E
LF
,
is
determined
by
measuring
the
reection
coecient
of
the
THRU
connection.
Transmission
signal
path
frequency
response
is
then
measured
with
the
THRU
connected.
The
data
is
corrected
for
source
and
load
match
eects
,
then
stored
as
transmission
frequency
response
,
E
TF
.
Isolation
Errors
.
Isolation,
E
XF
,
represents
the
part
of
the
incident
signal
that
appears
at
the
receiver
without
actually
passing
through
the
test
device
(Figure
A
-39).
Isolation
is
measured
with
the
test
set
in
the
transmission
conguration
and
with
terminations
installed
at
the
points
where
the
test
device
will
be
connected.
Figure
A
-39.
Isolation
E
XF
Error
T
erms
the
4395A
Can
Reduce
.
Thus
there
are
two
sets
of
error
terms
,
forward
and
reverse
,
with
each
set
consisting
of
six
error
terms
,
as
follows:
F
orward
Directivity
,
E
DF
Isolation,
E
XF
Source
Match,
E
SF
Load
Match,
E
LF
Transmission
Tracking,
E
TF
Basic
Measurement
Theory
A-55
Summary of Contents for 4395A
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Page 58: ...Power Requirements Figure 2 1 Power Cable Supplied 2 6 Installation Guide ...
Page 69: ...Connecting an Active Probe Figure 2 10 Connecting Test Fixture Installation Guide 2 17 ...
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Page 93: ...Step 2 Setting Up the 4395A Quick Start Guide 3 21 ...
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Page 251: ...Measuring Zero Span Figure 8 28 Marker Time Analyzing the Measurement Results 8 49 ...
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Page 410: ...Markers Figure A 19 Bandwidth Search Example A 34 Basic Measurement Theory ...
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