Decreasing
the
Frequency
Span
Using
the
marker
track
function,
you
can
quickly
decrease
the
span
while
keeping
the
signal
at
center
frequency
.
This
example
examines
a
carrier
signal
in
a
200
kHz
span.
1.
Set
the
receiver
to
a
known
state
by
pressing:
4
PRESET
5
4
INPUT
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
VIEW
CAL
ON
OFF
ON
4
FREQUENCY
5
NNNNNNNNNNNNNN
STOP
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700
4
MHz
5
4
PEAK
SEARCH
5
2.
Move
the
signal
to
the
center
of
the
screen
by
pressing:
4
MARKER
FUNCTION
5
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MK
TRACK
ON
OFF
ON
Because
the
marker
track
function
automatically
maintains
the
signal
at
the
center
of
the
screen,
you
can
reduce
the
span
quickly
for
a
closer
look.
If
the
signal
drifts
o
of
the
screen
as
you
decrease
the
span,
use
a
wider
frequency
span.
3.
Decrease
the
span
by
pressing:
4
SP
AN
5
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2
4
MHz
5
The
span
decreases
in
steps
as
automatic
zoom
is
completed.
See
Figure
6-7.
Y
ou
can
also
use
the
knob
or
step
keys
to
decrease
the
span.
Figure
6-7.
After
Zooming
In
on
the
Signal
4.
Turn
o
the
marker
track
function
by
pressing:
4
MARKER
FUNCTION
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MK
TRACK
ON
OFF
OFF
6-10
Making
EMI
Diagnostic
Measurements
