This includes:

• Compilation of existing acoustic-related data
• Calculation of radiating noise according to VDI 3733
• Determination of room influence and, if relevant, other background noise
• Determination of the expected acoustic level in the room or area
• Recommendation of measures to achieve the guaranteed emission values

Verification of the guaranteed emission values by acoustic evaluation and interpretation, partly by complex sound intensity measuring according to ISO 9614.

Sound optimisation for existing plants

• Recording of site acoustic data and conditions
• Comparison of measured data with the calculated disturbance variables (frequency position, resonant frequencies)
• Discussion of results; proposal and quoation for optimisation

Verification of the guaranteed values by acoustic evaluation and interpretation, partly by complex sound intensity measuring according to ISO 9614.

Sound measuring

Sound measuring is done by means of the sound level meter type 2238 Mediator ( Brüel & Kjaer) with ½” microphone.

This instrument meets the following standards:

• IEC 651 – 1979 type 1l
• EN 60651 type 1l
• IEC 804 – 1985 type 1
• EN 60804 type 1l
• Draft IEC 1672 / EN 61672 – April 1997
• ANSI S1.43 – 1983 type S1

The software NOISE EXPLORER type 7815 (Brüel & Kjaer) is used for measuring and evaluation.

Measuring is recorded as TERZ analysis (23% - band filter).

Sound measuring / Sound intensity measuring according to DIN EN ISO 9614 Part 1,2

This standard comprises two parts for measuring methods:
Part 1: Measuring at discrete points and
Part 2: Measuring by scanning

DIN ISO 9614 Part 2
Class 2 and 3 accuracy can be achieved by using the scanning method. Based on this classification upper uncertainty limits of measured sound power level can be guaranteed.

Sound intensity measuring is performed using the following measuring instruments: