Agilent Technologies 4395A - Page 95

Step
3:
Making
a Measurement
Setting
the
Resolution
Bandwidth
to
See
Low
Level
Signals
T
o
see
lower
level
signals
that
are
approximately
the
same level
as the
noise oor
, use
a narrow
resolution
bandwidth
(
rbw
)
setting.
Before
you
set
the
RBW
,
set the
maximum peak
level as
the reference
level. This
increases the
visibility
of
the
lower
level
signal.
This technique
is useful
when you
are measuring
two signals
and
one
is
very
close
to
the
noise
level.
Press
4
Marker
!
5
.
Press
F
F
F
F
F
F
F
F
F
FF
FF
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
MKR
!
REFERENCE
.
The
trace
moves
upward
to
place
the
tip
of
the
maximum
peak at
the top
line
of
the
grid.
Quick Start Guide 3-23