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The HHSL402SD is a generalpurpose handheld instrument that measures the noise level of an environment or the sound level produced by a piece of machinery. Using an integrated 13 mm (0.5') 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). 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 timestamping and storing the measurements on an SD card plugged into the instrument, 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 points 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 64 mm (2.5') diagonal display and is powered by six “AA” alkaline batteries or an optional 9V AC/DC adaptor.
Display Type: LCD with green backlight
Display Size: 52 x 38 mm (2.05 x 1.5')
Parameter Measured: dB
Frequency Range: 31.5 Hz to 8 kHz
Measurement Range: 30 to 130 dB in autoranging mode
User can also select fixed range of 30 to 80 dB, 50 to 100 dB, or 80 to 130 dB
By Frequency: Frequency weighing uses “A” or “C” standard
By Time: Time weighting is fast or slow (200 or 500 ms response time)
Measurement Accuracy: With “A” frequency weighting: ± 3.5 dB @ 31.5 Hz, 2.5 dB @ 63 Hz, 2 dB @ 125 Hz, 1.9 dB @ 250 Hz, 1.9 dB @ 500 Hz, 1.4 dB @ 1 kHz, 2.6 dB @ 2 kHz, 3.6 dB @ 4 kHz, 5.6 dB @ 8 kHz
Measurement Resolution: 0.1 dB
Data Logging Sampling Time: 1 second to 1 hour
Settable Parameters: Date, time, auto power off, beep sound, sampling time, decimal point or comma decimal division, “A” or “C” frequency weighting, fast or slow time weighting
Storable/Recallable Readings: Maximum, minimum
SD Card Capacity: 1 to 16 GB
Operating Temperature: 0 to 50°C (32 to 122°F)
Operating Relative Humidity: 0 to 85%
Power Supply: Six alkaline “AA” batteries or optional 9 Vdc AC adaptor
• 8 mADC (normal operation, with backlight off and SD card not saving data)
• 30 mADC with backlight on and card saving data
• 44 mADC with backlight on and card saving data
Dimensions of Meter: 245 x 68 x 45 mm (9.65 x 2.68 x 1.77')
Weight of Meter: 489 g (1.08 lbs)