EEVblog 1745 – How LOUD is the Continuity Tester

Testing the loudness of a new version of the BM2257 multimeter firmware using the CRY2851 Class 1 sound level meter.
https://www.crysound.com/product/cry2851-sound-level-meter/
COUPON CODE: LOUD for 10% off the BM2257
Hardware Store: https://eevblog.store/

00:00 – BM2257 Firmware changes
01:58 – Crysound CRY2851 Class 1 Sound Level Analyser
06:26 – Lab baseline dBA measurement
07:39 – dBA vs dBC vs dBZ weighting
08:51 – BM2257 Buzzer measurements
10:06 – Low frequency spectral analysis (How Low is Dave’s voice?)
11:00 – Designing and building a DIY acoustic test chamber
11:57 – BM2257 frequency spectrum analysis
14:04 – Different angle and distance repeat measurement
15:09 – Conclusion
17:26 – Bonus ventilation fan measurement

Forum: https://www.eevblog.com/forum/blog/eevblog-1745-how-loud-is-the-continuity-tester/

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