The standard tapping machine has five hammers placed in a line. Each hammer is lifted and dropped in turn, creating 20 impacts per second on the floor. In the room below or adjacent, a sound level meter is used to measure the sound level created by the impacts. Because the force and frequency of the impacts is known, the impact insulation provided by the floor can be determined from the sound level.
- ISO 140-7 Acoustics — Measurement of sound insulation in buildings and of building elements — Part 7:Field measurements of impact sound insulation of floors
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