The Amprobe SM-20A Sound Meter has been designed to check compliance with safety regulations and perform acoustic analysis by safety engineers, health, industrial and safety offices as well as quality control. The SM-20A offers a PC interface.
They use two different weighting filters required by the IEC651 and ANSI S1.4 Type 2 for audio filtering. The A weighting is for general noise sound level and the C weighting is for measuring sound level of acoustic material control in various environments (ie 94 dB 1 kHz, etc).
| Features | SM-20A |
| Microphone | 1/2 Electret condenser microphone |
| Standard applied | IEC 651 Type 2, ANSI 1.4 Type 2 |
| Dynamic range | 50 dB |
| Time weighting | Fast (125 mS), Slow (1 sec) |
| Frequency range | 31.5 Hz → 8 kHz |
| Measuring level range | (Auto Range) A-Weighting: 30 dB → 130 dB |
| C-Weighting: 35 dB → 130 dB | |
| Data | Min/max |
| Internal memory | 14,000 records |
| Specifications | |
| Display: | 4 digits LCD |
| Microphone: | 1/2 inch Electret condenser microphone |
| Power supply: | 9V NEDA 1604, IEC 6F22, JIS 006P battery |
| Auto power off: | Approx. 5 min |
| Environment: | Indoor operation, < 2000 m |
| Standard applied: | IEC 651 Type 2, ANSI 1.4 Type 2 |
| Dynamic range: | 50 dB |
| Resolution: | 0.1 dB, display update: 0.5 sec. |
| Time weighting: | FAST(125mS), SLOW(1 sec) |
| Accessories: | Carrying case, windscreen, User manual and 9V battery |
