Research Article
Experimental Investigations of Noise Control in Planetary Gear Set by Phasing
Table 12
Specifications of sound level meter.
| Frequency range | 31.5 Hz~8 KHz | Display | LCD | Measuring level range | 35~130 dB | Accuracy | ±1.5 dB (under reference conditions) | Dynamic range | 65 dB | Power supply | One 9 V battery, 006P or IEC 6F22 or NEDA 1604 | Calibration | Electrical calibration with the internal oscillator (1 kHz sine wave) |
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