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![General Tools DSM402SD [DSM402SD] Class 2 Sound Level Meter](image/cache/wp/gj/Products/General_DSM402SD-800x800.webp "General Tools DSM402SD [DSM402SD] Class 2 Sound Level Meter")
The DSM402SD is a general-purpose handheld instrument that measures the noise level of an environment or the amplitude of sound produced by a piece of machinery. Using an integrated 0.5 in. condenser microphone, the meter can measure sound levels from 30 to 130 dB with a resolution of 0.1 dB and show the results on a front-panel LCD.
Several features and capabilities enhance the meter’s versatility. Among them are the option to make measurements using autoranging or any of three manual ranges, the ability to hold readings and display maximum and minimum readings, and user-settable measurement parameters such as frequency weighting (using the “A” and “C” standards) and time weighting (fast or slow). The DSM402SD can be calibrated by an optional laboratory instrument.
Because it is microprocessor-based, the DSM402SD can make full use of the portability, reliability and large storage capacities that SD memory cards offer. Measurements can be made automatically at any sampling rate between one second and one hour. After time stamping and storing the measurements on an SD card plugged into the instrument (a process called data logging), the user can remove the card and plug it into to a laptop or desktop computer either directly or via a USB card reader. The data logs are stored on the card as files with the .xls extension, which can be opened by Microsoft’s Excel application. The DSM402SD has a backlit 2-1/2 in. diagonal display and is powered by six “AA” batteries or an optional 9V AC/DC adapter.
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