NF EN ISO 140-8 : 1997

1 Scope
2 Normative references
3 Definitions
4 Equipment
5 Test arrangement
    5.1 General arrangement
    5.2 Details of test arrangement
          5.2.1 Source room
          5.2.2 Receiving room
          5.2.3 Test floor
          5.2.4 Condition of floor surface
    5.3 Preparation and installation of test specimen
          5.3.1 Classification
          5.3.2 Installation
          5.3.3 Size and number of specimen
    5.4 Influence of temperature and humidity
6 Test procedure and evaluation
    6.1 Generation of sound field
    6.2 Measurement of impact sound pressure level
          6.2.1 Microphone positions
          6.2.2 Averaging time
    6.3 Frequency range of measurements
    6.4 Measurement of reverberation time and evaluation
          of the equivalent sound absorption area
    6.5 Correction for background noise
    6.6 Position of the tapping machine
          6.6.1 Adjustment of the tapping machine
          6.6.2 Materials of category I
          6.6.3 Materials of category II and III
7 Precision
8 Expression of results
9 Test report
Annexes
A Requirements for the tapping machine
B Form for the expression of results
C Bibliography

Defines a procedure for measurement of the acoustic properties of floor coverings from the view-point of reduction of impact noise transmission. Defines a procedure for determination of the noise reducing value of a floor covering under standard test conditions. This test is limited to the definition of methods for the physical measurement of sound originating from an artificial source (standard tapping machine) under laboratory conditions and is not directly related to the subjective significance of the results. Applies to all floor coverings, both single- or multi-layered, as installed on a standard floor. Multi-layered coverings can be factory- or test-site- assembled. Does not provide for allowing the assessing of effectiveness of a floor covering in situ.