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Analysis Frequency Limit (Hz)
171465
Fig.9.2.
Selection of maximum paper speed for less than 10% statistical
error
Therefore:
s
P·f
=21"T
(5)
Hence, for a maximum permissible error
€,
the requirement reduces to:
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~
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(6)
where
B is the measurement bandwidth
f
is the highest measurement frequency
g2
It can be seen that the factor -f- plays an important role. In effect, if a
constant bandwidth is used, the bandwidth should be small in order to
obtain an acceptable resolution at low frequencies. Also, as the frequency f
in the denominator is the highest frequency considered by the analyzer, the
measuring time over a wide frequency range may be very long.
84
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