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Summary of Contents for General DSM8925
- Page 1 DIGITAL SOUND METER WITH JUMBO DISPLAY USER’S MANUAL DSM8925 Please read this manual carefully and thoroughly before using this product.
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Page 2: Table Of Contents
TABLE OF CONTENTS Introduction ..... . 3 Key Features ..... 4 What’s in the Box . -
Page 3: Introduction
INTRODUCTION Thank you for purchasing General Tools & Instruments’ DSM8925 Digital Sound Meter with Jumbo Display. Please read this user’s manual carefully and thoroughly before using the instrument. The DSM8925 uses an integrated condenser microphone to measure the noise level of an... -
Page 4: Key Features
Physical features of the DSM8925 include an analog output jack for connecting to a data logger or chart recorder, a tripod mounting socket, and an adjustment screw for calibrating the meter to a standard 94 dB input. The DSM8925 includes a wind shield ball and is powered by four “AAA”... -
Page 5: What's In The Box
WHAT’S IN THE BOX The DSM8925 comes fully assembled in a box along with a wind shield ball, four “AAA” batteries and this user’s manual. PRODUCT OVERVIEW Figure 1 shows all of the controls, indicators and connectors on the front and right side of the DSM8925. - Page 6 F. REC—Enters/exits Recording mode G. RNG—Selects autoranging or manual ranging H. F/S—Selects fast or slow time response I. MAX HOLD button J. Calibration adjustment screw K. Analog output jack Figure 2 shows all text and icons that could appear in the display window at various times. 2.
- Page 7 FAST Meter is applying fast time weighting to inputs SLOW Meter is applying slow time weighting to inputs AUTO Meter is automatically choosing measurement range with best resolution MANU Meter is using user-selected measurement range BA Reserved for future use SPL Abbreviation of sound pressure level (the parameter measured) Meter’s battery is very low on charge...
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Page 8: Setup Instructions
SETUP INSTRUCTIONS INSTALL FOUR BATTERIES The meter’s battery compartment is accessible from the back of the unit. Use a Philips-head screwdriver to remove the one screw holding the cover in place. Then install the four included “AAA” batteries so their + and –... -
Page 9: Autoranging Vs
AUTORANGING VS. MANUAL RANGING The DSM8925 has four measurement ranges: 40 to 70 dB, 60 to 90 dB, 80 to 110 dB, and 100 to 130 dB. When the meter is powered on, it automatically enters Autoranging mode. - Page 10 The meter can display its results more quickly because it does not have to first determine which range to use. To exit Autoranging Mode and enter Manual Ranging mode, briefly press the RNG button on the front panel. Note that when you press the button, the text MANU replaces AUTO on the left side of the display.
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Page 11: Time And Frequency Weighting Options
FAST to SLOW. To return to fast time weighting, press the F/S button again. As mentioned earlier, when the DSM8925 is powered on it begins operating with “A” frequency weighting. The shape of the “A”... -
Page 12: Storing And Recalling Min And Max Readings
A to C. To switch back to “A” frequency weighting, press the A/C button again. STORING AND RECALLING MIN AND MAX READINGS The DSM8925 can also operate in “Recording” mode, for the purpose of tracking and displaying minimum and maximum sound level measurements. -
Page 13: Operating In Max Hold Mode
session. While the digital display is showing the minimum sound value, the meter continues to measure real-time sound level inputs and to display its results on the analog bar graph. To display the maximum sound level measured since entering Recording mode, press the REC button briefly one more time. -
Page 14: Disabling Auto Power Off
However, the digital display is updated only when the meter detects a louder sound. To enter MAX HOLD mode, press the MAX HOLD button at the lower right of the front panel. To exit this mode, press the MAX HOLD button again DISABLING AUTO POWER OFF By default, the meter powers off automatically... -
Page 15: Calibrating The Meter
94 dB. Using a small Philips- head screwdriver, turn the calibration adjustment screw on the right side of the DSM8925 until its display shows the same reading as the calibrator’s, ±0.1 dB. -
Page 16: Specifications
SPECIFICATIONS Measurement Range 40 to 130 dB over four ranges Measurement Accuracy ±2 dB Digital Display Resolution 0.1 dB Digital Display Refresh 160 milliseconds Period Analog Bar Graph 1 dB Resolution Analog Bar Graph 40 milliseconds Refresh Period Frequency Range 31.5 Hz to 8 kHz Display Window Size 1.18 (W) x 1.38 (H) in. -
Page 17: Maintenance Tips
General determines to be from an attempted repair by non-authorized personnel or misuse, alterations, normal wear and tear, or accidental damage. The defective unit must be returned to General Tools & Instruments or to a General-authorized service center, freight prepaid and insured. -
Page 18: Return For Repair Policy
Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product. In no event shall General be liable for any incidental, special, consequential or punitive damages, or for any cost, attorneys’... - Page 19 NOTES ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________...
- Page 20 New York, NY 10013-3567 PHONE (212) 431-6100 FAX (212) 431-6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com DSM8925 User’s Manual Specifications subject to change without notice ©2011 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS. MAN#DSM8925 6/20/11...
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