INTRODUCTION
Thank you for purchasing General Tools & Instruments’ HHSL402SD Sound Level Meter with
Datalogging SD Card. Please read this user’s manual carefully and thoroughly before using
the instrument.
The HHSL402SD is a general-purpose handheld instrument that measures the noise level of
an environment or the sound level 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 liquid-crystal display.
Several features and capabilities enhance the meter’s versatility. Among them are
autoranging, 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 HHSL402SD can be calibrated by an
optional laboratory instrument.
Because it is microprocessor-based, the HHSL402SD 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 datalogging), 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 HHSL402SD has a backlit 2-1/2 in. diagonal display and is powered by six “AA”
Alkaline batteries or an optional 9V AC/DC adapter.
KEY FEATURES
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Measures sound levels of machinery or an environment
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Big (2.5 in. diagonal) front-panel green backlit LCD is easy to read
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Makes measurements in autoranging mode or within a manually settable range
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Displays maximum and minimum readings and holds any reading
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Performs automatic datalogging at sampling time settable from 1 second to 9 hours
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Also supports manual logging and changing of card storage location
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Outputs Excel-compatible data logs
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Accepts SD memory cards of up to 16 GB capacity
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Auto power off function
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Powered by six “AA” batteries or optional 9V AC/DC adapter
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