Searching
for a
Bandwidth
The
analyzer can
automatically
calculate
and
display
the
0
3
dB
bandwidth
(BW:),
center
frequency
(CENT:), Q,
and
loss
of
the
device
under
test
at
the
center
frequency
.(Q
stands for
\quality
factor,"
dened
as
the
ratio
of
a
circuit's
resonant
frequency
to
its
bandwidth.)
These
values
are shown
in
the
marker
data
readout.
1.
Press
4
MARKER
5
and
turn
the
front
panel
knob
or
enter
a
value
from
the
front
panel keypad
to
place
the
marker
at
the
center
of
the
lter
passband.
2.
Press
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
MKR
ZERO
4
MARKER F
CTN
5
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
MKR
SEARCH
to
access
the
marker
search
menu.
3.
Press
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
WIDTHS
ON
to
calculate
the
center
stimulus
value
,
bandwidth,
and
the Q
of a
bandpass or
band
reject
shape
on
the
measurement
trace
.
4. If
you
want
to
change
the
amplitude
value
(default
is
0
3
dB)
that
denes
the
passband
or
rejectband,
press
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
WIDTH
VALUE
and
enter the
new value
from the
front
panel
keypad.
Figure
2-22.
Example
of
Searching
for
a
Bandwidth
Using Markers
Tracking
the
Amplitude
that
Y
ou
are
Searching
1.
Set
up
an
amplitude
search
by
following one
of the
previous procedures
in \T
o Search
for a
Specic
Amplitude
."
2.
Press
4
MARKER F
CTN
5
N
NNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NN
MKR SEARCH
NNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNN
TRACKING ON
to track the specied amplitude search
with every new trace
and put the active marker on that point.
When tracking is not activated, the analyzer nds the specied amplitude on the current
sweep and the marker remains at same stimulus value
, regardless of changes in the
trace
response value with subsequent sweeps
.
Making Measurements 2-25
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