digital sound level meter dsm8930
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1. Dimensions 8 1 X 2 4 x 1 6 in 210 x 61 x 40mm Weight 5 2 oz 1479 including battery Power Source 1 9V battery MAINTENANCE TIPS When the qT icon appears at the upper right of the display it s time to replace the 9V battery that powers the instrument although measurements will remain valid for several hours after the icon first appears To replace the battery follow the instructions on p 6 Remove the battery when storing the meter and when you do not expect to use it for an extended period of time months rather than weeks Do not drop or disassemble the meter or immerse it in water WARRANTY INFORMATION General Tools amp Instruments General s DSM8930 Digital Sound Level Meter is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship This warranty does not apply to damages that 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 amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contra2. horizontal analog bar graph Several features improve the meter s versatility Among them are A frequency weighting and fast 125 ms time response The meter can display real time readings or the minimum or maximum sound levels measured since being powered on Physical features of the DSM8930 include a wind shield ball and an analog output jack for connecting to a chart recorder The DSM8930 is powered by one 9V battery included KEY FEATURES e Measures sound level of a machine or an environment e Meets IEC651 TYPE 2 and ANSI S1 4 TYPE 2 standards e Large backlit LCD analog bar graph e A frequency weighting and fast time weighting e Autoranging e Tracks and displays maximum and minimum readings e 20 minute Auto Power Off e Analog output for chart recording e Includes wind shield ball e Powered by one 9V battery included WHAT S IN THE BLISTER PACK The DSM8930 comes fully assembled in a blister pack along with a wind shield ball one 9V battery and this user s manual PRODUCT OVERVIEW Figure 1 shows all of the controls indicators and connectors on the front bottom and right side of the DSM8930 Figure 2 shows all text and icons that could appear on the LCD Familiarize yourself with the positions and functions of these symbols and structures before moving on to the Setup Instructions Fig 1 The DSM8930 s controls display and connectors A Wind shield ball covering El
3. GENERAL DIGITAL SOUND LEVEL METER USER S MANUAL DSM8930 Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS Introduction ccc ec cece eens 2 3 Key Features ira roaa ana AEAEE cea 3 What s in the Blister Pack 000ceeeaee 4 Product Overview 00 c cece eee e eee ee 4 5 Setup Instructions 00 cece eee eee eee 6 Install Battery cis ci si lt thee thawed arbre ae 6 Operating Instructions 0000 eee 6 8 Making Basic Measurements 6 7 Tracking MIN and MAX Levels 7 8 Specifications soirassa ue R tesa TETEA 9 Maintenance TipS 0 cece eee eens 10 Warranty Information 0000 10 11 Return for Repair Policy 0cc ee eaee 11 INTRODUCTION Thank you for purchasing General Tools amp Instruments DSM8930 Digital Sound Level Meter Please read this user s manual carefully and thoroughly before using the instrument The DSM8930 uses an integrated condenser microphone to measure the noise level of an environment or the loudness of a machine typically in order to comply with health and or safety rules The meter has a measurement range of 40 to 130 dB over four ranges an accuracy of 2 dB 2 and a digital display resolution of 0 1dB Real time measurements are shown on a green backlit LCD in two forms as a three or four digit dB value and as a moving vertical line on a
4. ct for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for 10 any cost attorneys fees expenses or losses alleged to be a consequence of damage due to failure of or defect in any product including but not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address 11 Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street 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 DSM8930 User s Manual Specifications subject to change without notice 2012 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN DSM8930 8 16 12
5. ectret microphone 79 B LCD C ly Power on off MIN and MAX buttons D Battery compartment E Audio output jack MAX MIN OO LILI T fetal ested etal etal feta 0 10 20 30 Fig 2 All possible display indications and their meanings MAX MIN SPL dB 40 0 10 20 30 Digital readout is highest level recorded since meter was powered on Digital readout is lowest level recorded since meter was powered on Abbreviation of sound pressure level the parameter measured Meter s battery is very low on charge and should be replaced Sound level unit accompanies reading at its left Range Baseline low end of current measurement range in dB 40 indicates 40 to 70 dB range other possible numbers at this position are 60 for 60 to 90 dB range 80 for 80 to 110 dB range and 100 for 100 to 130 dB range Labels of analog bar graph scale Indicate amplitude of input in dB relative to low end of measurement range above left end of graph SETUP INSTRUCTIONS INSTALL BATTERY 1 The meter s battery compartment Fig 1 Callout D is accessible from the back of the unit near the bottom Use a Phillips head screwdriver to loosen the screw holding the yellow battery compartment cover in place Set the cover and screw aside Remove the 9V battery from the blister pack and plug it into the wired socket inside the compartment The terminals of the battery and the socket
6. mate in only one way with the smaller male terminal plugging into the larger female terminal Replace the battery compartment cover and tighten the screw to secure it to the housing N oo OPERATING INSTRUCTIONS MAKING BASIC MEASUREMENTS Press the button to power on the meter The display will take a few seconds to stabilize and then begin reading out real time sound level measurements Note how the digital numbers and the readings on the analog bar graph track each other At times the two displays may seem slightly out of sync and they are because they refresh at different rates Also note how the number above the left end of the bar graph the Range Baseline changes each time a much louder or softer sound is heard Each change confirms that 6 the meter is operating in Autoranging mode To demonstrate that autoranging is on in a quiet environment rub the windscreen with your hand to simulate a loud noise and watch the Range Baseline change to 100 dB To measure the loudness of a sound source point the microphone at it The measurement calculation reflects the meter s fixed settings A frequency weighting and fast time weighting The shape of the A frequency weighting curve simulates the response of the human ear so A weighting is suitable for measuring the sound level of an environment for the purpose of regulatory compliance workplace design or noise pollution control Fast time weighti
7. ng with a response time integration time constant of 125 milliseconds also simulates the response time of the human ear and is most suitable for measuring the volume of singular events If a sound level is below 40 dB the readout will be LO If a sound level is above 130 dB the readout will be HI TRACKING MIN AND MAX LEVELS After being powered on the DSM8930 automatically operates in Recording mode for the purpose of tracking and displaying minimum and maximum sound level measurements To display the minimum sound level measured since the meter was powered on press the MIN button The text MIN will appear on the top line of the display and the digital display will indicate the lowest sound volume measured since power on 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 the meter was powered on press the MAX button The text MAX will replace MIN on the top line of the display and the digital display will indicate the highest sound volume measured since power on While the digital display is showing the maximum sound value the meter continues to measure real time sound level inputs and to display its results on the analog bar graph To exit MIN or MAX display mode and return the digital display to showing real time values press whichever button cor
8. responds to the current display mode You cannot switch from MIN to MAX mode by pushing the opposite button You must first exit one mode before entering the other By default the meter powers off automatically after 20 minutes of inactivity by the end user no front panel buttons are pushed to extend the 9V battery s life This APO feature cannot be disabled As a result you cannot track sound levels for longer than 20 minutes by feeding the meter s 0 to 0 707VAC analog output signal from the jack on the right side of the meter Fig 1 Callout E into a chart recorder However 20 minutes is more than sufficient to perform and document a typical sound level check SPECIFICATIONS Measurement Range 40 to 130 dB over four ranges 40 to 70 dB 60 to 90 dB 80 to 110 dB 100 to 130 dB Measurement Accuracy 2 dB Display Size Type Digital Display Resolution 4 digit 4000 count LCD 0 1 dB Digital Display Refresh Period 160 milliseconds Analog Bar Graph Resolution Analog Bar Graph Refresh Period 1 dB 40 milliseconds Frequency Range Time Weighting Time Constant 100 Hz to 8 3 kHz 125 milliseconds Microphone Diameter Type 0 5 in 12 7mm Electret condenser Battery Life 30 hours typical Analog Output 0 to 0 707VAC Operating Temperature 32 to 122 F 0 to 50 C lt 80 R H Storage Temperature 4 to 122 F 20 to 50 C lt 90 R H
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