Agilent Technologies 4395A - Page 300

FM
Signal
Measurement
(SA)
Figure
10-19.
Wide
Band
FM
Signal
Measurement
The frequency
deviation
(
1f
peak
)can
be
derived
roughly
from
the
following
equation:
1
f
peak
=
j
1
M
k
r
j
2
where
1Mkr
is
the
marker
sweep
parameter
value
shown
in
Figure
10-19.
In this
example
,
the
frequency
deviation
is
about
987.5
kHz.
Press
4
Ma
rk
er
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
PRESET
MKRS
when
you
are
nished
with
this
measurement.
Carrier
Level
and
Modulating Frequency
The
carrier
level
and modulating
frequency
can
be
derived
using
a
method
similar
to
the
AM
signal
measurement.
In
this
example
,
the
zooming
function
is
used
to
measure
the
carrier
and
the
adjacent
signal.
1.
Press
4
Ma
rker
5
4
1
5
4
0
5
4
0
5
4
M/

5
to
put
the
maker
on
the
carrier
frequency
.
2.
Press
4
Ma
rk
er
!
5
N
N
N
N
N
N
N
N
N
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
N
N
N
N
N
N
ZOOMING
APERTURE
4
0
5
4
.
5
4
2
5
4
2
1
5
.
3.
Press
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
MKR
ZOOM
to
zoom
up
to
the
carrier
signal.
4.
Press 4
Bw/Avg
5
4
1
5
4
0
5
4
2
1
5
.
5. Press
4
Scale Ref
5 and enter reference vale if the trace needs rescaling.
6. Press
4
Marker
54
1
54
0
54
0
54
M/ 
5 to move the marker to the career frequency
. The carrier
amplitude can be read as the marker value
.
7.
Press 4
Marker
5
NNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNN
1MODE MENU
NNNNNNNNNNN
NNN
1MKR to put the
1maker on the carrier
.
8.
Press 4
Search
5
NNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNN
SEARCH: PEAK
NNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNN
NEXT PEAK LEFT
(or
NNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNN
NEXT PEAK RIGHT
) to move the marker
to the sideband.
10-22 Examples of Applications