Agilent Technologies HP 8642A/B Specifiche Pagina 275

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How
to
Change
the FFT
Segment Table
Example
for
Decreasing Measurement Time
The default
FFT
Segment Table
can be
modified
to
speed-up
the
measure-
ment
by
performing
the
following procedure.
1.
Delete
the
first
two
lines
in the
default table
by
placing
the
cursor
on
the first line
and
pressing
the
Delete Segment
softkey twice.
2.
Change
the
first entry under "Plotted Range"
to 1.
The resulting table shown below provides measurements
to 1 Hz
mini-
mum frequency offset
in 2
minutes less time than
the
default settings
for
a four average measurement.
Plotted
Range
(Hz)
1
- 100
100
- 500
500
- 1E+3
1E+3
-
10E+3
10E+3
-
100E+3
Measurement
Range
(Hz)
0
- 100
100
- 500
500
- 1E+3
0
-
10E+3
0
-
100E+3
Min.
Av'g
5
30
30
100
100
BW
(Hz)
.955
3.819
4.774
95.485
954.850
Time Record
Length (Seconds)
4.000
1.000
.800
.040
.004
NOTE
A drawback when using this technique
is the
limit placed
on marking spurs.
For
this example, spurs below
10 Hz
will
not
be
marked.
The HP
3048A does
not
mark spurs within
the first
10% of the
measurement span.
FFT Segmnts
5-19
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