Table 4 Specifications of equipment used for cab interior noise measurement and analysis.
From: Effect of sound insulation on noise reduction in an agricultural tractor cab
Equipment | Model | Specification |
|---|---|---|
Frontend | Siemens SCADAS Mobile | Maximum sampling rate: 204.8 kHz Dynamic range: 150 dB ADC technology: 24-bit delta-sigma |
Microphone | PCB 377B02 | Nominal diameter: 1/2″ (12.7 mm) Frequency range: (\(\pm\) 2 dB) 3.15 to 20,000 Hz Dynamic range: 147 dB(A) |
Preamplifier | PCB 426E01 | Temperature range: − 40 to 80 °C Output voltage: \(\pm\) 7 Vpk |
Acoustic calibrator | Larson Davis CAL200 | Operating frequency: 1000 Hz Sound pressure level: 94 or 114 dB(A) Distortion: less than 2% |
Tachometer | PCB LT-2 | Maximum speed: 100,000 rpm Operating range: 51 cm |
Sound camera | SM instruments SeeSV-S206 | 96 Ch. Digital MEMS microphone Frequency range: 25–12,800 Hz Signal to noise ratio: 64 dB(A) |
