# Tapping machine

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{{For|thread cutting tools|tap and die}}
A '''tapping machine''' is a device used to test the impact [sound insulation](/source/sound_insulation) of floors, for measurements of impact noise (noise of footsteps) in the field of [building acoustics](/source/building_acoustics).

The standard tapping machine<ref>ISO 16283-2:2015(E) Acoustics — Field measurement of sound insulation in buildings and of building elements — Part 2: Impact sound insulation</ref> has five hammers placed in a line. Each hammer is lifted and dropped in turn, creating 10 impacts per second on the floor. In the room below or adjacent, a sound level meter is used to measure the [sound level](/source/Sound_intensity_level) created by the impacts. Because the [force](/source/force) and [frequency](/source/frequency) of the impacts is known, the impact insulation provided by the floor can be determined from the sound level.

== References ==

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Category:Acoustics

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Adapted from the Wikipedia article [Tapping machine](https://en.wikipedia.org/wiki/Tapping_machine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Tapping_machine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.