DIN 45635-12:1978-03

1 Purpose and field of application
2 Other relevant Standards
3 Concepts, quantities
4 Instrumentation
      4.1 Sound level meter
      4.2 Filters
      4.3 Verification of test installation
5 Test conditions
      5.1 Objects to be tested
      5.2 Operating condition of the switchgear and
             control gear
      5.3 Installation of the switchgear and control gear
      5.4 Measurement surface, measuring distance,
             location and number of measuring points
      5.5 Test environment
6 Test procedure
      6.1 Measurement of the A-weighted impulse sound
             pressure level LaI
      6.2 Measurement of the impulse sound pressure
             spectrum
      6.3 Measurement of the background noise level
      6.4 Determination of the area of measurement surface
             S and of the measurement surface ratio Ls
7 Evaluation
8 Measurement uncertainty
9 Test report
10 Acoustical characteristic

Establishes the prerequisites for the determination of the noises radiated by switchgear and control gear to the surrounding air during the switching process (noise emission) in accordance with standardized methods, so that the results obtained are comparable.