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Hand-held Analyzer Types 2250 and 2270 – User Manual
A.3 Statistics
The Percentile levels N1 to N7 are common to broadband and spectral statistics, and can be
changed after the measurement has been done.
Table A.3
Statistics parameters (available for microphone input only)
*
*. Not available for Reverberation Time Software BZ-7227.
Parameter Values Comment
Broadband Statistics based on L
Xeq
L
XF
L
XS
The broadband statistics are based on sampling the
broadband parameter L
XF
or L
XS
each 10 ms or
L
Xeq
each second.
Note: X = frequency weighting A or B. ‘A’ requires
that the Broadband (excl. Peak) parameter is set to
AC or AZ. ‘B’ requires that the Broadband (excl.
Peak) parameter is set to BC or BZ
Spectral Statistics based on
†
†. Requires Frequency Analysis Software BZ-7223.
LXF
LXS
The statistics are based on sampling the
instantaneous spectrum every 100 ms (200 ms for
Low Frequency set to On). The time weighting for
the spectrum is either F or S. The frequency
weighting X is determined by the Frequency
Weighting, Spectrum parameter
Percentile N1 0.1 to 99.9 User-defined percentile level where the value of
L
XN1
is exceeded for N1% of the elapsed time
Percentile N2 0.1 to 99.9 User-defined percentile level where the value of
L
XN2
is exceeded for N2% of the elapsed time
Percentile N3 0.1 to 99.9 User-defined percentile level where the value of
L
XN3
is exceeded for N3% of the elapsed time
Percentile N4 0.1 to 99.9 User-defined percentile level where the value of
L
XN4
is exceeded for N4% of the elapsed time
Percentile N5 0.1 to 99.9 User-defined percentile level where the value of
L
XN5
is exceeded for N5% of the elapsed time
Percentile N6 0.1 to 99.9 User-defined percentile level where the value of
L
XN6
is exceeded for N6% of the elapsed time
Percentile N7 0.1 to 99.9 User-defined percentile level where the value of
L
XN7
is exceeded for N7% of the elapsed time
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