Amprobe SM-20A Sound Meter

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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).

Microphone1/2 Electret condenser microphone
Standard appliedIEC 651 Type 2, ANSI 1.4 Type 2
Dynamic range50 dB
Time weightingFast (125 mS), Slow (1 sec)
Frequency range31.5 Hz ? 8 kHz
Measuring level range(Auto Range) A-Weighting: 30 dB ? 130 dB
C-Weighting: 35 dB ? 130 dB
DataData holdMin/max
Internal memory14,000 records
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