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)