â·ÃÊͺ¶ÒÁÃÒ¤Ò The Extech SL355 is a low cost, lightweight, and easy to use personal noise dosimeter for measuring total sound exposure. SL355: Personal Noise Dosimeter/Datalogger Compact, lightweight meter with USB interface Features: Perform OSHA and IEC Noise accumulation surveys One user-defined measurement setup Adjustable Criterion Level, Exchange Rate, and Threshold Measures frequency weighted noise exposure and peak sound level simultaneously Datalogs up to 12,000 readings when used as a sound level meter with sampling times between 1sec and 1hr In sound level mode, meter displays sound level, time-averaged sound level (Leq), peak, and sound exposure level (SEL) Stores up to 20 dosimeter surveys including Start/Stop Time, %Dose, %Dose projected for an 8 hour period, and peak level when used in the Dosimeter mode UBS Interface. Includes Windows® compatible software to control setup and retrieve/analyze stored data. Applications include: personal accumulated noise exposure measurement, workplace noise assessment, OSHA and other regulatory agency compliances Complete with belt clip and clip-on 0.5" microphone with 2.6ft (0.8m) cable, 3 AAA batteries, mini screwdriver and carrying case, PC software, and USB cable Specifications: Standards: IEC61252 ,ANSI S1.25(1992) for dose and sound exposure meters IEC 60651-1979 Type 2 for sound level meters ANSI S1.4-1983 Type S (1) for sound level meters Ranges: 60 - 130 dB / 70 to 140dB (A/C Weighting) 60 to 130dB / 93 to 133dB (C or Z (Linear) Peak) 70 to 140dB / 103 to 143dB (C or Z (Linear) Peak) Digital Display: LCD 0.01-9999% Criterion Level: 80, 84, 85, or 90dB Exchange Rate: 3, 4, 5 or 6 dB Threshold Level: 70 to 90 (1dB steps) High Level Detector/Peak Flag: 115dB, 130dB and 140dB Response Rate: Fast or Slow Measurement Duration: 5, 10, 15, or 30 minutes 1, 2, 4, 8, 12, or 24 hours Microphone: 1/2 inch electret condenser with 31” cable Battery Life: >35 hrs Event Storage: 20 surveys USB Interface: yes Real time clock/calendar: yes Dimensions/Weight: 3.8 x 2 x 1.4” (97 x 51 x 35mm) 4.2oz. (120g) incl.batteries Extech SL355 Sound Level Meter Sound Meter à¤Ã×èͧÇÑ´¤ÇÒÁ´Ñ§àÊÕ§ à¤Ã×èͧÇÑ´àÊÕ§