Svantek SVAN 971 - Page 79

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