Agilent Technologies 4395A - Page 283

Measuring
Transmission
Characteristics
of a
Filter (NA
Mode)
Figure
10-4.
Using
P
eak
Search
to
Determine
Ripple
Press
4
Chan
1
5
4
Ma
rk
er
5
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
PRESET
MKRS ,
and 4
Chan
2
5
4
Ma
rk
er
5
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
PRESET
MKRS when
you are
nished
with this
measurement.
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
(NA
Mode)"),
make
the
following
changes:
1.
Press
4
Chan
1
5
4
Sw
eep
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
COUPLED
CH
on
OFF
to
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
ON
off
to
couple
sweep
parameters
of
channel
2
to
channel
1.
2.
Press 4
Chan
2
5
4
F
o
rmat
5
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
PHASE
to display
the phase
response on
channel 2.
If
the trace
needs
to
be
rescaled,
press
4
Scale
Ref
5
and
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
AUTO
SCALE .
Figure
10-5
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
0 180 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
0 180 degrees
.
This wrap causes the characteristic \sawtooth" display usually seen
on devices with linearly increasing (or decreasing)
phase responses
.
Examples of Applications 10-5