14-20 Viewing and Analyzing Results Model 831 Manual
Table 14-6 Quality Indicators for Tonality Deficiencies
Quality Indi-
cator Icon
Deficiency Remedy
The measurement has not been averaged for
at least one minute (see ISO 1996-2 section
C.2.2)
Run the measurement for at
least one minute.
The weighting is set to C (see ISO 1996-2
section C.2.2).
Change the setting to A
weighting to perform a stan-
dard measurement.
The weighting is set to Z (see ISO 1996-2
section C.2.2).
Change the setting to A
weighting to perform a stan-
dard measurement.
The window type is not Hanning (see ISO
1996-2 Note 1).
Change the setting to Han-
ning window to perform a
standard measurement.
The tone bandwidth is not less than 10% of
the critical bandwidth (see ISO 1996-2 sec-
tion C.2.2).
Increase the resolution of the
measurement by increasing
the number of Lines, or by
decreasing the Frequency
Span in the FFT settings.
The appearance of the icon
even after the Hanning win-
dow is selected indicates that
the bands of noise do not
qualify as tones as specified
in the ISO 1996-2 standard.
The effective bandwidth is not less than 5%
of the critical bandwidth.
Change the window type.
The sound measurement does not contain suf-
ficient regression data and therefore cannot
display a standard linear regression line.
Increase the Regression
Range on the Tonality tab.
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