Agilent Technologies 4395A - Page 281

Measuring
Transmission
Characteristics
of a
Filter (NA
Mode)
P
erforming Calibration
P
erform a
frequency
response
calibration
for
this
measurement
as
follows:
1.
Press 4
Cal
5
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
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N
N
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N
N
N
N
N
N
N
N
CALIBRATE MENU
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
RESPONSE .
2.
Connect
a
THRU
calibration
standard
between
the measurement
cables in
place of
the DUT
.
3.
Press
N
N
N
N
N
N
N
N
N
N
N
N
N
N
THRU
to
perform
a
frequency
response
calibration
data
measurement.
4.
Press
N
N
N
N
N
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
NN
N
N
N
DONE:
RESPONSE
.
(
N
N
N
N
N
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
NN
N
N
N
N
N
N
N
N
N
N
N
N
CORRECTION
on
OFF
is
automatically
set
to
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
ON
off
.)
Measurement
Replace
the
THRU
standard
with
the
DUT
.
Press
4
Scale
Ref
5
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
AUTO
SCALE
if
the
trace
needs
to
be
rescaled.
Note
that
the
display
shows
the
complete response
of the
bandpass lter
under
test.
Read
Out
Insertion
Loss
Using
the
Marker
1.
Press
4
Sea
rch
5
N
N
N
N
N
N
N
N
N
N
N
MAX
to
move
the
marker
to
the
maximum
value
of
trace
.
The
marker
reads
out
the
insertion
loss
and displays
it
at
the
upper
right
of
the
display
.
2.
Press
4
Ma
rker
5
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
N
N
N
1MODE
MENU
N
N
N
N
N
N
N
N
N
N
N
N
N
N
1MKR
to
turn
on
the
1Marker
(at
the
position
of
the
marker).
3.
Enter
4
1
5
4
5
5
4
0
5
4
k/m
5
to
move
the
marker
to
the
point
oset
from
the
1marker
.
The
1marker
value
shows
the
relative
attenuation
at
the
oset
position
(see
Figure
10-2
).
Figure 10-2. Response of a S
AW
Filter
6 dB Bandwidth
The analyzer calculates the bandwidth of the DUT between two equal power levels
.Inthis
example, it calculates the
0 6 dB bandwidth relative to the lter center frequency
.
1.
Press 4
Search
5
N
NNNNNNNNNN
MAX to move the marker to the maximum value of the trace.
2.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WIDTHS [OFF] 4
0
54
6
54
2 1
5 .
3.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WIDTHS on OFF to
NNNNNNNNNNNNNNNNNNNN
ON off . The analyzer calculates the 0 6 dB bandwidth, center
frequency, Q (Quality Factor), insertion loss, and dierences between the center frequency
and the cuto frequencies of the DUT. It then lists the results at the upper right hand of the
Examples of Applications 10-3