Svantek SVAN 971, Руководство пользователя

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SVAN 971 User Manual
79
Lnn Statistical Noise Levels, the certain boundary level
surpassed by the temporary noise level values in
not more than nn% of the observation period.
Lnn
are calculated on the base of 100ms Leq results and
renewed every second on the display as cumulated
statistics over the current measurement time.
Appendix D
L(den) Day-evening-night equivalent level, Leq . Sound
Level, measured over the 24 hour period, with a
10 dB penalty added to the levels between 23.00
and 07.00 hours and a 5 dB penalty added to the
levels between 19.00 and 23.00 hours to reflect
people's extra sensitivity to noise during the night
and the evening. The instrument displays: Ld, Le,
Ln, Lde, Len, Lnd, or Lden depending on the day
and night time which the measurement covers. Due
to different country requirements, it is possible to
shift day time from 7h-19h to 6h-18h.
Appendix D
PSEL Individual Sound Exposure Level to the noise is
equal to the standing sound level in a measurement
period. The
PSEL result is calculated on the base of
the LEQ .
Appendix D
DOSE Quantity of noise received by the worker, expressed
as the percentage of the whole day acceptable
value. Appendix D
D_8h Quantity of noise received by the worker for 8 hours. Appendix D
PrDOSE Quantity of noise received by the worker during
exposure time. Appendix D
LAV Average level of the acoustic pressure for the given
time period of the measurement. Appendix D