I.S. EN ISO 140-12:2000

Foreword
1. Scope
2. Normative references
3. 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 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 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 method to measure the airborne and impact sound insulation of an access floor with a plenum of defined height mounted below an acoustical barrier which separates two rooms of a specified test facility.