HP 8753D - Page 259

T
o
Widen
the
System
Bandwidth
1.
Press
4
A
V
G
5
N
N
N
N
N
NN
NN
NN
NN
NN
NN
IF
BW
.
2.
Set the
IF bandwidth
to change
the
sweep
time
.
The
following table
shows the
relative increase
in sweep
time
as
you
decrease
system
bandwidth.
The characteristic
values in
the
following
table
were
derived
using
201
measurement
points.
IF
B
W
Cycle
Time
(Seconds)
1
Full
Span
Narrow
Sweep
3700
Hz
.446 .150
3000
Hz
.447 .176
1000
Hz
.511 .312
300
Hz
.944 .980
100
Hz
2.25 2.070
30
Hz
7.57 7.240
10
Hz
21.98 21.600
1
The
listed
sweep
times
correspond
to
an
HP
8753D
analyzer
being
set
to
a
preset
state
for
the
full
span,
and
2
GHz
to
3
GHz
for
the
narrow
span.
T
o
Reduce
the
A
veraging
F
actor
By
reducing
the
averaging
factor
(number
of
sweeps)
or
switching
o
averaging,
you
can
increase
the
analyzer's
measurement
speed.
The
time
needed
to
compute
averages
can
also
slow
the
sweep
time
slightly
,
in
narrow
spans
.
1.
Press
4
A
V
G
5
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
AVG
FACTOR .
2.
Enter
an
averaging
factor
that
is less
than the
value displayed
on
the
analyzer
screen
and
press
4
x1
5
.
3.
If
you
want
to
switch
o
averaging,
press
4
AV
G
5
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
N
N
N
N
N
AVERAGING
OFF
.
To Reduce
the Number of Measurement P
oints
1.
Press 4
MENU
5
NNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNN
NUMBER OF
POINTS .
2. Enter a number
of points that is less than the value displayed on the analyzer screen and
press 4
x1
5 .
5-52 Optimizing Measurement Results