
Start
Freq.
(in Hz)
The system allows you to enter a start frequency within the range of the
measured data. The (Acceptable Value) range is displayed in the lower left
portion of the HP 3048A's display.
Stop
Freq.
(in (Hz)
The system allows you to enter a stop frequency within the range of the
measured data. The (Acceptable Value) range is displayed in the lower left
portion of the HP 3048A's display.
Minimum Range of Integration
Frequency offsets < 100 kHz
To measure frequency offsets less than or equal to 100 kHz, the HP 3048A
uses the HP 3561A FFT Dynamic Signal Analyzer. The minimum fre-
quency resolution of the HP 3561A is equal to its frequency span divided
by 400. Each of the 400 increments is called a Bin. The HP 3048A cannot
integrate less than 1 Bin. To determine the resolution of 1 Bin, divide the
frequency span by 400. The HP 3561A's frequency span is denned in the
FFT Segment Table.
,,. . .
r
, _. HP
3561A
Frequency Span
Minimum range oj Integration = 1 Bin = —-
Fbr example: A frequency span setting on the HP 3561A of 100 Hz
will provide 0.25 Hz of resolution for each Bin. Therefore, the minimum
frequency range you can specify for integration is 0.25 Hz in the frequency
range where the data from the 100 Hz span is plotted.
In tear Noise 4-5
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