Setting
the
IF/Resolution/Video
Bandwidth
Setting
the
Resolution
Bandwidths
(S
A
Mode)
A
djusting
the
RBW
can
improve
the
resolution
of
the
frequency and
lower the
displayed noise
oor
.
1.
Press
4
Bw/Avg
5
.
2.
Choose
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
N
RES
BW
.
3.
Change
the
RBW
setting
using
4
*
5
,
4
+
5
,
or
the
.
Measuring
two
or
more
mutually
adjusting
signals
requires
special
considerations on
the width
of
the
4395A
's
internal
IF
lter
.
If
the internal
IF lter
is wider
than the
dierence
between
the
signals
,
the
analyzer
cannot
separate
them.
T
o avoid
this problem,
you must
provide a
resolution
bandwidth
(RBW)
small
enough
for
the
4395A
to
identify
the
respective signals
.
A
small
RBW
can
reduce
the
noise
power
per
display
point,
thereby lowering
the displayed
noise
oor
and
making
it
possible
to
display lower
level signals
.
F
or
example
,
the
trace
of
a
400
Hz amplitude
modulated signal
conceals
sidebands
in
the
skirt
of
the
carrier
trace
when
the
RBW
is
300
Hz.
In
this
case
,you
can
split
the
carrier
and
sidebands
completely
and
lower
the
displayed
noise
oor
by
setting
the
RBW
to
10
Hz.
RBW 300
Hz RBW
10 Hz
Figure 6-16. Setting Resolution Bandwidth (RB
W)
Setting the Resolution Bandwidth to
Auto Mode
You can automatically set the
resolution bandwidth in accordance with the percentage of the
sweep span.
1. Press
4
Bw/Avg
5
.
2.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RBW/SPAN RATIO
and enter the percentage of the sweep span with entry keys.
3.
Toggle to
N
NNNNNNNNNNNNNNNNNNNNNNNNN
AUTO man
.
Setting and Optimizing Measurement Conditions 6-27
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