Noise measurements are also essential to evaluate a system with regards to its environmental compatibility. The noise values of all permanently mounted machines are determined according to internationally standard measurement procedures so that all data can be compared. Complete assessment of noise emissions looks at the measurement room, the influence of extraneous noise, position and number of measurement points, measurement distance, measurement area, operating conditions and the accuracy of the measurement method.

The measurand for every individual measurement point is generally the time-averaged sound pressure level. This is evaluated according to the frequency-dependent human ear sensitivity. (A-evaluation).

Where necessary, non-valuated sound pressure spectra in the octave and third octave band are determined at all or individual measurement points. In order to obtain the measurement area sound pressure level, the individual measured values are determined and evaluated locally.

If the size of the machine is also taken into account, the result is the internationally specified noise characteristic, the sound power level.

Using the sound power level as a parameter, it is possible to evaluate whether the system noise emissions are moving within the required limit values or whether additional noise-reduction measures are necessary.