PCE Health and Fitness DSA 50, Руководство пользователя

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1.4. Measured quantities
Many quantities used to characterize acoustic noise can be measured simultaneously
using DSA-50 digital sound analyzer. The set of measured quantities depends on
instrument operating mode. Measurement duration and battery condition information is
displayed at every operating mode.
1.4.1. Sound level meter (SLM) mode
For two frequency weightings, selected among from three ones: A, C and Z available in
the instrument, following quantities can be measured simultaneously (in symbols listed
below X stands for selected frequency weighting):
LXF current RMS, F-time-weighted sound level,
LXFmn minimum RMS, F-time-weighted sound level,
LXFmx maximum RMS, F-time-weighted sound level,
LXS current RMS, S-time-weighted sound level,
LXSmn minimum RMS, S-time-weighted sound level,
LXSmx maximum RMS, S-time-weighted sound level,
LXI current RMS, I-time-weighted sound level,
LXImn minimum RMS, I-time-weighted sound level,
LXImx maximum RMS, I-time-weighted sound level,
LXPk current peak sound level,
LXMPk maximum peak sound level,
LXeq time-average (equivalent continuous) sound
LXeq1s time-average sound level for last one second.
If A frequency weighting is one of two selected weightings, then following quantities
are measured additionally for this weighting:
LAE sound exposure level,
LAEX,T noise exposure level referred to specified exposure
1.4.2.
1/1-octave analyzer mode
1/1-octave analyzer contains nine digital octave-band filters having exact centre
frequencies specified for binary octave ratio. Nominal centre frequencies are 31.5Hz,
63Hz, 125Hz, 250Hz,500Hz, 1kHz, 2kHz, 4kHz and 8kHz. Specifications of filters conform
to Class 1 requirements of EN 61260:1995 and EN 61260:1995/A1:2001.
Following quantities can be measured simultaneously for each filter centre frequency (and
also for wide-band response), when one frequency weighting is selected among from
three available weightings (A, C and Z):
LF current RMS, F-time-weighted sound level,
LS current RMS, S-time-weighted sound level,
Leq time-average sound level.