| Calibrated Device |
(1) Sound Calibrator
(2) Pistonphone
(3) Sound Level Meter
|
|---|---|
| Range |
(1) 90 dB re 20 μPa to 120 dB re 20 μPa (31.5 Hz to 16 kHz)
(2) 90 dB re 20 μPa to 130 dB re 20 μPa (250 Hz)
(3a) Frequency: 250 Hz (124 dB) or 1 kHz (94 dB or 114 dB)
(3b) Frequency: 31.5 Hz to 16 kHz (94 dB or 104 dB or 114 dB)
|
| Uncertainty |
(1)(2) Comparison method: 0.15 dB，Insert-voltage method: 0.09 dB to 0.18 dB
(3a) 0.2 dB
(3b) 0.3 dB to 0.6 dB
|