| Zugriffsnummer | 25829 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Pattern approval tests of sound level meters: the influence of mechanical vibrations on their performance |
| Autor(in); Institution |
Ratschko, Dirk; 1.1, Masse, PTB-Braunschweig
Bork, Ingolf; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | Acta Acustica united with Acustica: 97 (2011), 2, 342 - 346 |
| ISSN | 1610-1928 (PRINT) ; 1861-9959 (ONLINE) |
| DOI | |
| Verlag | Stuttgart: Hirzel |
| Klassifikationscode | PACS: 43.40.At ; PACS: 43.40.Ey |
| Freie Schlagworte | Pattern Approval Tests ; Sound Level Meters ; Mechanical Vibrations |
| Zusammenfassung | Mechanical vibrations of a base which, during measurement, affect the sound level meter (SLM) via a tripod can have a considerable influence on the measuring value displayed. Especially vibrations along the main measuring direction of the microphone (reference direction) cause a mechanical stimulation of the microphone and a considerable reduction of the linear measuring range. To check the vibrational sensitivity, an automatic measuring assembly has been set up in which two sound level meters are exposed simultaneously to a sound field of constant frequency. The displayed A-weighted values of both meters are compared with each other while one of the two meters is stimulated by an electro-dynamic shaker to vibrate at a band limited acceleration of 1 m/s². The stimulation is applied in two directions: (1) in the reference direction of the microphone and (2) turned 90° in the direction perpendicular to the reference direction. The frequency of the stimulation varies between 31.5 Hz and 1 kHz. The result of the measurement shows that the lower limit of linearity under the specified conditions of mechanical vibration may be shifted to a level of up to more than 75 dB(A). |
