Setting
the
Frequency
Range
Narrowing
the
Span
Setting
(S
A
Mode)
1.
Press
4
Sea
rch
5
.
2.
Choose
N
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
SEARCH:
PEAK
to
place the
marker on
the carrier
.
3.
T
oggle
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
SIGNAL
TRK
on
OFF
to
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
ON
off
.
4.
Narrow
the
span
setting.
See
the
\Setting
the
Frequency
Span"
procedure.
An
extremely
small
span
setting
may
cause
the
test
signal
to disappear
from display
. This
happens
because
of
the
dierence
between
the displayed
and actual
frequencies.
For
example
,
when
the
span
setting
is
set
to full
span, the
displayed test
signal frequency
has
an
error
of
approximately
600
kHz
because
of
its
resolution (500
MHz/800). A
span setting
smaller than
the
error
frequency
can
cause
the
test
signal
to
disappear from
the screen
depending on
the
error
range
.
The
signal
track
function
allows you
to avoid
this situation.
When
signal
track
is
enabled,
the
analyzer
narrows
the
span
setting
while centering
the test
signal
as
you
narrow
the
span
setting.
Therefore
,
the
test
signal
is
placed
at
the
center
of the
grid.
The
following
gure
shows
an
example
of
narrowing
the
span
with
the
signal track
function.
The
actual signal
frequency is
250.100025 MHz.
When
the
center
is
xed
and
the
span
is
10
kHz,
the
signal
is
out
of
display
.
The
signal
track
function
tracks
the
signal
by
changing
the
center
frequency
,
and
keeps
displaying
the
signal
at
the
center
of
the
display
.
Span
500MHz Span 10kHz
Figure 6-9. Narrowing Span with Signal Track
Setting the Frequency Range to Full Span.
1. Press
4
Span
5
.
2.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FULL SPAN
This function is useful when you want to get a general view of the spectrum after you have
obtained the detailed view of a specic signal.
6-20 Setting and Optimizing Measurement Conditions
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