Normalized lateral impact sound level Ln,f

Définition and scope

Determination of lateral transmission of impact sound of raised floors excited by a standard tapping machine.

The measurement shall be performed in a laboratory.

Evaluation method according to DIN EN ISO 10848-2 

Expression of results: Calculation of the single index Ln weighted according to DIN EN ISO 717-2

Values of Ln, f in third octave bands between 100 and 3150 Hz accounted for, accuracy of 1/10th of a dB.

Vertical displacement of a reference curve by 1 dB jumps until the sum of adverse deviations is the largest while remaining less than or equal to 32 dB.

Ln, f, w is the value given by while the reference curve at 500 Hz.

Example Ln,f test result