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Figure 5. The digitizer’s available memory also constrains the operating region
Figure 4. The allowable range of spans, which may differ by model, further bound
the operating region of the digitizer
1.E-08
1.E-07
1.E-06
1.E-05
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10 1.E+11
Span (Hz)
Time record length (sec)
Minimum
Operating region: span constraints
Number of frequency points
Operating region
204801
409601
102401
51201
25601
12801
6401
3201
1601
801
401
201
1.E-08
1.E-07
1.E-06
1.E-05
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 1.E+09 1.E+10 1.E+11
Span (Hz)
Time record length (sec)
Minimum
Operating region: with memory constraints
Number of frequency points
Operating region
204801
409601
102401
51201
25601
12801
6401
3201
1601
801
401
201