Добрый день! В сертификате к оверлокам данного бренда, указано:
Back ground noise:= $7 dB(A) AL=(tested noise)-(back ground noise) = 23
Measurement time per position 25_s (>= 15s of time interval of a processing cycle)
Measurement equipment: • Sound level meter or/and I Integrated sound level meter
_dB(must >=3dB)|
Sound pressure level measurement at work station: average of two maximum cycles 67,9 dB