
Decreasing Measurement Time
for
Measuring
.1 Hz
Offsets
The entries shown
in the
following table provide
a
decrease
in
measure-
ment time
for
measuring down
to .1 Hz
minimum offsets.
In
this example,
spurs
< 1 Hz
will
not be
marked.
Plotted
Range
10E-3
.1
10
100
500
1E+3
i0E+3
(Hz)
1
10
100
500
1E+3
10E+3
100E+3
0
0
0
100
500
0
0
Measurement
Range
-
-
-
-
-
-
-
(Hz)
.1
10
100
500
1E+3
10E+3
100E+3
Min.
Av'g
1
1
5
30
30
100
100
BW
CHz)
.010
.095
.955
3.819
4.774
95.485
954.850
Time Record
Length (Seconds)
400.000
40.000
4.000
1.000
.800
.040
.004
Example
for
Measuring
.001 Hz
Offsets
The
FFT
Segment Table shown below demonstrates
how the
frequency
offset range
can be
extended down
to 0.001 Hz.
These changes will
in-
crease
the
measurement time
to
approximately
5
hours
for a
measurement
using
4
minimum averages.
Plotted
Range
.001
.064
1
10
100
500
1E+3
10E+3
(Hz)
.064
1
10
100
500
1E+3
10E+3
100E+3
0
.064
0
0
100
500
0
0
Measurement
Range
-
-
-
-
-
-
-
-
(Hz)
.064
1
10
100
500
1E+3
10E+3
100E+3
Min.
Av'g
i
1
1
5
30
30
100
100
BW
(Hz)
.001
.010
.095
.955
3.819
4.774
95.485
954.850
Time Record
Length (Seconds)
6250.000
400.000
40.000
4.000
1.000
.800
.040
.004
5-20
FFT
Seamnts
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