The configuration of the sound level meter is as follows:
Range – 49.7–129.7 dB.
Bandwidth 1/3 octave.
Peaks over 140 dB.
Global statistics – Fast time weighting and A frequency
weighting.
Spectrum – Fast time weighting and A frequency weighting.
Global measures – A&L frequency weightings.
Logging – 1 record/minute.
The configuration of the dosimeter is as follows:
Range – 70–140 dB.
Time weighting-Fast.
Frequency weighting-A.
Frequency weighting for peaks-C.
Exchange rate-3 dB.
Threshold-75 dB.
Criteria level-85 dB.
Logging-1 record/minute.
Two different softwares have been used for obtaining and processing
the measurements. These are ‘‘Protector” [18] and ‘‘Evaluator”
[19], both by Bruel & Kjaer. ‘‘Protector” is a software package
that has been used for post-processing and archiving noise exposure
data recorded with the dosimeter; it makes the calculations
according to ISO 9612.2. Meanwhile, ‘‘Evaluator” is a software
package that has been used for post-processing, making graphics
and tables and archiving measured levels and spectra taken with
the sound level meter; it has several standards according to which
the calculations can be made, for example ISO1996, DIN45 645, TA
Lärm, NF S 31-010, BS 4142. Both softwares produced the same results
regarding the global levels, with a little tolerance of no more
than 2 dB, after processing the recorded data; so the measurement
procedure and the results of the measurements are validated again