Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968 b 2.1-1 (a)
Original description
Perforated gypsum board, 12.5 mm thick, 20.2% open area, 12/20 mm holes
ISO 354 – reverberation chamber
αp nach ISO 11654
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Method (354): Measured
