Model 831 Manual Configuring a Measurement 14-5
Lines
The Lines setting selects the number of discrete frequency
bands or bins.
The choices are:
• 6400
• 3200
• 1600
•800
• 400
The frequency resolution is rounded
to at most 2 decimal places on the
Model 831.
The frequency resolution and bandwidth of each bin is
determined by the Frequency Span and the number of lines
as shown in Table 14-1.
Table 14-1 Frequency Resolution (Hz)
Window
Three Window options are available in the Model 831 to
provide emphasis or balance between frequency selectivity
and amplitude ripple as the signal frequency varies from one
bin to another. The choices are:
• Rectangular
•Hanning
• Flat Top
Frequency Weighting
The Frequency Weighting setting selects a broadband A, C
or Z-weighted pre-filter. A broadband Leq and peak level is
measured using this weighting in addition to the weighting
being applied to the FFT spectrum.
Frequency Span (Hz)
100 200 500 1000 2000 5000 10000 20000
400
0.25 0.5 1.25 2.5 5 12.5 25 50
800
0.125 0.25 0.625 1.25 2.5 6.25 12.5 25
1600
0.0625 0.125 0.3125 0.625 1.25 3.125 6.25 12.5
3200
0.03125 0.0625 0.15625 0.3125 0.625 1.5625 3.125 6.25
Number of Lines
6400
0.015625 0.03125 0.078125 0.15625 0.3125 0.78125 1.5625 3.125
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