General Tools DSM402SD User Manual
CLASS 2 SOUND LEVEL METER WITH
EXCEL-FORMATTED DATA LOGGING
SD CARD
USER’S MANUAL
DSM402SD
Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
What's in the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 –6
Calibrating the Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 –7
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 10
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 –8
Holding and Storing Measurements . . . . . . . . . . . . . . . . . 8
Automatic vs. Manual Data Logging . . . . . . . . . . . . . 8 –9
Transferring Data from the SD Card
to a Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 – 10
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 – 11
Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
INTRODUCTION
Thank you for purchasing General Tools & Instruments’ DSM402SD Class 2 Sound Level
Meter with Excel-formatted Data Logging SD Card. Please read this user’s manual carefully
and thoroughly before using the instrument.
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 timestamping 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.
KEY FEATURES
• Big (2.5 in. diagonal) front-panel green backlit LCD is easy to read
• Makes measurements in autoranging mode or within any of three manual ranges
• Displays maximum and minimum readings and holds any reading
• Performs automatic data logging at sampling time settable from 1 second to 1 hour
• Also supports continuous manual data logging and changing of card storage location
• Outputs Excel-compatible data logs
• Accepts SD memory cards of up to 16 GB capacity
• Auto power off function that can be disabled to enable long-term data logging
• Powered by six “AA” batteries or optional 9V AC/DC adapter
3
WHAT’S IN THE CASE
The DSM402SD comes fully assembled in a hard carrying case along with a sound wind
shield ball, a 2 GB SD memory card and this user’s manual.
Optional accessories available from General Tools & Instruments include a 94 dB or
94/114 dB sound calibrator and a 9VDC adapter for a 110V power supply. See the Optional
Accessories section of this manual on p. 11 for more details.
PRODUCT OVERVIEW
Figure 1 shows all of the controls and indicators on the front, right side, back and bottom of
the DSM402SD. Familiarize yourself with the positions and functions of these controls,
indicators and connectors before moving on to the Setup Instructions.
TOP
FRONT
BOTTOM
RIGHT
SIDE
BACK
Fig. 1. The DSM402SD’s controls and indicators and other physical features
1-1 LCD
1-2 POWER/ESC button
1-3 HOLD/NEXT button
1-4 REC/ENTER button
▲
button
1-5
▼
button
1-6
1-7 SET button
4
1-8 LOGGER button
1-9 Microphone
1-10 AC OUT jack
1-11 94dB CAL screw
1-12 RS232 output jack
1-13 DC9V jack
1-14 Threaded tripod
attachment fitting
1-15 Battery compartment
cover screws
1-16 Flip-up stand
1-17 Battery compartment
cover
1-18 SD card socket
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