B&K 2250 Light Manual do Utilizador descarregar pdf (Página 44)

Hand-held Analyzer Types 2250 and 2270 – User Manual

fluctuating sound pressure level. It is a measure of the averaged energy in a varying sound

level. It is not a direct measure of annoyance, though extensive research has shown that L

correlates well with annoyance.

is measured directly with any SLM. If an A-weighting filter is used, it is expressed as L

Aeq

the measurement of the equivalent continuous sound level using the A-weighted filter network.

A full range of measurement parameters is given in Appendix B.

4.2 What is the Hand-held Analyzer?

The hand-held analyzer is a versatile hardware platform suitable for covering a wide range of

different applications. Together with Sound Level Meter Software BZ-7222, it is a Class 1

modular precision integrating-averaging sound level analyzer with an easy to use interface for

quick and simple measurement setups.

4.2.1 Sound Level Meter Software Module BZ-7222

Sound Level Meter Software BZ-7222 allows you to measure a comprehensive set of

parameters used for rating noise in terms of its impact on the environmental and working

environments and on occupational noise evaluation.

The more commonly used parameters for sound measurements, which cover a large range of

applications, are either instantaneous measured parameters (available at any time) or timed

measured parameters (measured within a controlled time interval):

Timed Measured Parameters

• Equivalent Continuous Sound Levels (L

– example: L

Aeq

)

• Moving (or sliding) Equivalent Continuous Sound Levels (example: L

Aeq,T,mov

and

Aeq,T,mov,max

)

• Peak Sound Levels (L

peak

– example: L

Cpeak

)

• Time for Peak Sound Level (example: T

Cpeak

)

• Maximum Time-weighted Sound Levels (L

max

– example: L

AFmax

)

• Minimum Time-weighted Sound Levels (L

min

– example: L

AFmin

)

• Percentile Levels (L

– example: L

AF90.0

)

• Sound Exposure Level (example: L

)

• Sound Exposure (example: E)

• Daily Noise Exposure Levels (example: L

ep,d

or L

EX,8h

)

• Noise Dose (example: based on ISO standards: Dose, based on US standards: DoseS5)

• Number of Peaks (example: #CPeaks(>140 dB))

• Time Weighted Average (example: TWA)

• Level Average with Exchange Rates 4, 5 or 6 (example: L

avS5

)

• Weather data (requires a weather station connected)

• GPS data (requires a GPS device connected)

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