Agilent Technologies Agilent 4396B User Manual
Page 92
Measuring
Phase
Response
A
two
input
ratio
measurement
can
also
provide
information
about
the
phase
shift
of
a
network.
The
analyzer
can
translate
this
information
into
a
related
parameter
,
group
delay
.
With
the
same
connection,
instrument
settings
,
and
calibration
used
in
the
previous
example
(see
\Measurement
Setup
"
in
\Measuring
Transmission
Characteristics
of
a
Filter"),
make
the
following
changes:
1.
Press
4
Chan
1
5
4
Sw
eep
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
COUPLED
CH
on
OFF
to
NNNNNNNNNNNNNNNNNNNN
ON
off
to
couple
sweep
parameters
of
channel
2
to
channel
1.
2.
Press
4
Chan
2
5
4
F
ormat
5
NNNNNNNNNNNNNNNNN
PHASE
to
display
the
phase
response
on
channel
2.
If
the
trace
needs
to
be
rescaled,
press
4
Scale
Ref
5
and
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AUTO
SCALE
.
Figure
5-5
shows
the
phase
response
of
the
bandpass
lter
.
Notice
the
linear
phase
shift
through
the
passband
and
the
rapid
uctuations
that
occur
outside
this
region.
The
random
phase
of
the
broadband
noise
oor
causes
the
spurious
out-of-band
response
.
This
format
displays
phase
over
the
range
of
0180
to
+180
degrees
.
As
phase
increases
beyond
these
values
,
a
sharp
360
degree
transition
occurs
in
the
display
as
the
trace
\wraps"
between
+180
and
0180
degrees
.
This
wrap
causes
the
characteristic
\sawtooth"
display
usually
seen
on
devices
with
linearly
increasing
(or
decreasing)
phase
responses
.
Figure
5-5.
Amplitude
and
Phase
Response
of
a
Dielectric
Filter
5-6
Network
Measurement
Examples