Table 4.
Specifications of equipment used for cab interior noise measurement and analysis.
| 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: ( 2 dB) 3.15 to 20,000 Hz Dynamic range: 147 dB(A) |
| Preamplifier | PCB 426E01 |
Temperature range: − 40 to 80 °C Output voltage: 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) |