Acoustics Standards

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Calibrated Device
(1) Sound Calibrator
(2) Pistonphone
(3) Sound Level Meter
Range
(1) (90 to 120) dB re 20 μPa (31.5 Hz to 16 kHz)
(2) (90 to 130) dB re 20 μPa (250 Hz)
(3a) Frequecy: 250 Hz (124 dB) or 1 kHz (94 dB or 114 dB)
(3b) Frequecy: 31.5 Hz to 16 kHz(94 dB or 104 dB or 114 dB) 
Uncertainty
(1)(2) Comparison method: 0.14 dB,Insert-voltage method: 0.08 dB to 0.18 dB
(3a) 0.2 dB
(3b) 0.2 dB to 0.6 dB
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