B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 312)

300

Hand-held Analyzer Types 2250 and 2270 – User Manual

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.

den

, L

day

, L

evening

night

, L

Noise Indicators for describing the annoyance due to exposure to

environmental noise.

den

(day-evening-night noise indicator), L

day

(day-noise indicator), L

evening

(evening-noise indicator) and L

night

(night-noise indicator) are defined by the

European Union. They are based on L

Aeq

over different periods: L

day

over

the day period from 7:00 to 19:00, L

evening

over the evening period from

19:00 to 23:00, L

night

over the night period from 23:00 to 7:00 and L

den

over

the whole day with a penalty of 5 dB(A) for the evening period and a penalty

of 10 dB(A) for the night period.

(day-night level) is defined by the Environmental Protection Agency (EPA)

in the USA as a descriptor of noise level based on L

Aeq

over the whole day

with a penalty of 10 dB(A) for night time noise (from 22:00 to 7.00).

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.

ep,d,v

: The Daily Noise Exposure Level for a user-defined reference period. L

ep,d,v

is calculated from the measured L

and the settings of Exposure Time and

Reference Time. Used, for example, for calculating a Weekly Noise Exposure

Level, by setting the Reference Time to 40 h.

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