Community Research and Development Information Service - CORDIS


Calibrations of three types of sound calibrators by means of seven different microphone types at seven EEC standards laboratories have been compared. The intercomparison was radially organised with PTB (Germany) as the pilot laboratory and included CSIC (Spain), DTH (Denmark), INM and LNE (France), NPL (United Kingdom) and VSL (Netherlands). For a precision type of sound calibrator, the sound pressure levels determined by the laboratories span about 0.09 dB. The corresponding values for ordinary types of sound calibrators are much higher (0.23 dB). The lowest scattering ranges between laboratories were measured with ordinary microphones of type 4134 with a protection grid and type 4144 or 4145 with a coupler ring, but not as might be expected with the laboratory standard microphones (types 4160, 4134M). At frequencies of 250 Hz and 1000 Hz, the sensitivity levels of non-standard microphones (types 4176, MK 221) were found to span 0.2 dB.

Additional information

Authors: RICHTER U, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);GÖSSING P, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);DOWSON S P, National Physical Laboratory, Teddington (GB);SANDERMANN OLSENE, Technical University of Denmark, The Acoustics Laboratory, Lyngby (DK);RASMUSSEN K, Technical University of Denmark, The Acoustics Laboratory, Lyngby (DK);LECOLLINET M, Institut National de Métrologie, Paris (FR);BANGET-MOSSAZ G, Laboratoire National d'Essais, Paris (FR);CHINCHURRETA F J, Instituto de Acustica, Madrid (ES);SIGUERO M, Instituto de Acustica, Madrid (ES);JOL L, Van Swinden Laboratorium, Delft (NL);DE VREEDE J P M, Van Swinden Laboratorium, Delft (NL)
Bibliographic Reference: EUR 14405 EN (1992) 255 pp., MF, ECU 12
Availability: (2)
Record Number: 199210914 / Last updated on: 1994-12-02
Original language: en
Available languages: en