Agilent Technologies 4395A - Page 249

Measuring
Zero
Span
Measuring
Zero
Span
1.
Determine the
following parameters:
Sweep
Time
Number
of Display
Points
(NOP)
2.
Press 4
Center
5
. Then
enter the
frequency of
the target
signal.
3.
Press
4
Span
5
and choose
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
ZERO
SPAN to
set
the
frequency
span
to
0
Hz.
4.
Press
4
Sw
eep
5
.
5.
Press
4
Sw
eep
5
and
choose
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
SWEEP
TIME
,
and
then
enter
the
sweep
time.
6.
Press
4
Sw
eep
5
and
choose
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
N
N
N
N
N
N
N
N
NUMBER
of
POINTS .
Then enter
your desired
number
of
points
(NOP).
Note
T
able
8-2
lists
default settings
when the
span
is
switched
to
normal
span
or
zero
span
in
spectrum
analyzer
mode
.
T
able
8-2.
Default
Settings
When
Switched
to
Normal
Span
or
Zero
Span
Switched
to
Normal
Span
Switched
to
Zero
Span
RBW
mode
A
uto
Manual
RBW A
utomatically
determined
3
MHz
Sweep
time
mode
A
uto
(Fixed
1
) Manual
(Fixed
1
)
Sweep
time
A
utomatically
determined
32

sec
NOP
2
A
utomatically
determined
801
Detection
mode
P
ositive
peak
Sample
1
Sweep
time
mode
can
not
be
changed
in
spectrum
analyzer
mode
.
2 Number of display points
You must specify an RBW equal to or greater than 3 kHz. If your specied
value is smaller than 3 kHz, the 4395A automatically sets the RBW to 3 kHz.
When you change the sweep time in zero span measurement of spectrum
analyzer mode
, the sweep time is limited by the number of display points
.If
you
want to set a shorter sweep time than the limited sweep time
, reduce
the number of display points with
4
Sweep
5
NNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNN
NUMBER of POINTS
, and then set a
desired sweep time with
NNNNNNNNNNNNNNNNN
SWEEP . If you want to set a longer sweep time than
the limited sweep time, increase the number of display points,andthenseta
desired sweep time.
The minimum time resolution and maximum sweep time in measuring zero
span are listed in Table 8-3 .
Analyzing the Measurement Results 8-47