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APPENDIX E

Glossary

183

AFmin

: Minimum time-weighted sound level measured with A-frequency weighting

and Fast time weighting. It is the lowest level of environmental noise occurring

during the measurement time (time resolution is 1 s).

AF90.0

: The noise level exceeded for 90% of the measurement period with A-frequency

weighting and Fast time weighting. The level is based on statistical analysis of

a parameter (LAF or LAS) sampled at 10 ms intervals into 0.2 dB wide classes.

The percentage is user-definable.

An analysis of the statistical distributions of sound levels is a useful tool when

assessing noise. The analysis not only provides useful information about the

variability of noise levels, but is also prominent in many standards as the

basis for assessing background noise. For example, L

AF90

is used as an

indicator of background noise levels while L

AF10

or L

AF5

are sometimes used

to indicate the level of noise events.

A90.0

: The noise level exceeded for 90% of the measurement period with A-frequency

weighting. The level is based on statistical analysis of L

Aeq

sampled at 1 s

intervals into 0.2 dB wide classes. The percentage is user-definable.

AF(SPL)

: The Sound Pressure Level (maximum time-weighted sound level during the

latest second) is available at any time. 'A' denotes that the A frequency

weighting is used. 'F' denotes that the Fast time-weighting is used.

AFTeq

: Taktmaximal Mittelungspegel as defined by DIN 45641. L

AFTeq

has also been

called L

AFTm5

or L

ATm5F

avUQ

: Average Sound Level with Time Weighting U = F or S and Exchange Rate

Q = 4, 5 or 6. This is a widely used occupational health noise parameter in

the USA, corresponding to the L

Aeq

used otherwise.

Cpeak

: Maximum peak sound level during a measurement. ‘C’ denotes that the C

frequency weighting is used. Used for assessing possible damages to human

hearing caused by very high short-duration noise levels.

Cpeak,1s

: Maximum peak sound level during the latest second – is available at any

time. 'C' denotes that the C frequency weighting is used. Used for monitoring

the peak levels.

ep,d

: The Daily Noise Exposure Level is the average A-weighted noise exposure

level for a nominal 8-hour working day. L

ep,d

is also known as L

EX,8h

. L

ep,d

is calculated from the measured L

, the setting of Exposure Time and a

Reference time of 8 h. Used for assessing the noise exposed to a worker

during a working day – in accordance with ISO standards.

The European Noise at Work Directive 2003/10/EC defines the following limit

and action values:

Exposure Limit Value: 87 dB

Upper Exposure Action Value: 85 dB

Lower Exposure Action Value: 80 dB

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