Svantek SVAN 971 - Page 80

SVAN 971 User Manual
80
SEL8
SEL result corresponding to the integration time
equal to 8 hours. The SEL8 result is calculated on
the base of the LEQ.
Appendix D
E
Exposition represents the amount of the acoustical
energy received by the worker.
Appendix D
E_8h
Exposition in 8 hours represents the amount of the
acoustical energy received by the worker for
8 hours. The E_8h result is expressed in the linear
units [Pa
2
h].
Appendix D
PTC
Peak Threshold Counter – the number of the
overpasses of the Threshold Level by Lpeak result.
This result is incremented in 100 ms intervals.
Appendix D
PTP
PTC result expressed in percent.
Appendix D
ULT
Upper Limit Time - time that SPL exceeded the “ULT
Threshold Level” set during configuration.
Appendix D
TWA
Time Weighted Average - average A-weighted
sound level for a nominal 8-hour workday with Time
Weighting S and Exchange Rate 5. TWA is usually
measured with A-weighting and Slow response
detector type. TWA is calculated from the measured
LAV (taking Threshold Level into account) and a
Reference time of 8 h. Mainly used in the USA for
assessing the noise exposure for a worker during a
workday.
Appendix D