NEN EN ISO 140-12 : 2000

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measuring equipment
5 Test arrangement
      5.1 Requirements for the laboratory
             5.1.1 Construction of the test facility
             5.1.2 Dimensions of the test facility
             5.1.3 Dividing wall
             5.1.4 Access floor height
             5.1.5 Plenum lining
      5.2 Installation of access floor
6 Test procedure and evaluation
      6.1 Generation of sound field in the source room
             6.1.1 Airborne noise
             6.1.2 Impact sound pressure level
      6.2 Measurement of the average sound pressure level
             6.2.1 General
             6.2.2 Microphone positions
             6.2.3 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 Maximum value of normalized flanking level
             difference
7 Precision
8 Expression of results
9 Test report

Covers a laboratory procedure for measuring airborne and impact sound insulation of an access floor with a plenum of specified height mounted below an acoustical barrier separating two rooms of a defined test facility. The procedure uses a laboratory space arranged so that it simulates a pair of horizontally adjacent rooms or offices sharing a common access floor system, plenum space and dividing wall. The wall extends from ceiling to upperside of floor system which at the junction is continuous or discontinuous. The procedure may be extended to the study of the additional sound insulation that can be attained by auxiliary systems, for instance material used as backing for all, or part of the floor, or as plenum barriers.