Agilent Technologies 4395A - Page 232

Measuring
Phase
Deviation
2.
Press
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
DELAY
.
3.
Press
4
Scale
Ref
5
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
AUTO
SCALE .
The
group delay
format displays
the phase
deviation to
the group
delay aperture
.
Therefore
,
setting
the group
delay aperture
aects the
trace shape
. Setting
a wider
aperture
makes
the
trace
smoother
.
The aperture
defaults to
1% of
the
span.
Setting
the Group
Delay Aperture
.
1.
Press 4
Bw/Avg
5
.
2.
Press
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
GROUP
DELAY
APERTURE
.
3.
Enter
group
delay
aperture
value
as
a
percentage of
the span.
The
group
delay
aperture
is
based
on
the
number
of
points,
not the
real aperture
.
F
or
example
,
if
the
number
of
points
is
201,
a
1%
group
delay aperture
causes the
4395A to
calculate
the
group
delay
using
the
adjacent
measurement
points
on
both
sides
. Therefore
,the
group delay
trace
may
dier
depending
on
the
specied
number
of
points
.
Aperture
1%
Aperture 5%
Figure
8-15. Setting
Group Delay
Aperture
8-30 Analyzing the Measurement Results