Dawson DSM141
Contents
1. FAST Real time value SLOW Average Value HOLD Data Hold MAX Maximum UNDER Sound Level Below Range OVER Sound Level Over Range A A Weighting Mode C C Weighting Mode dB Decibel SONE Sound Unit Sone CA Low Battery Indicator 9 Using the Meter Preparation If the battery voltage is lower than 4 5V the EI symbol will appear and the batteries should be replaced Cover the metal microphone with microphone cover that s included Auto gear level 30 130 dB is not suitable for measuring impact noise Readings Hold Press H button to hold the readings of current measurement Press H button again to release the hold Backlight To light up the LCD press key to turn on backlight The light will be on for 6 seconds 10 Sound Level Measurement dB Basic Functions Press the power button the default measurement range is 40 90dB The measured ambient sound level is displayed within this range If UNDER or OVER is displayed on the LCD the ambient sound is either lower or higher than the 40 90 dB range limit These numbers are located on upper left right sides of the screen If so the measurement value is not guaranteed Click A Up or Y Down key to set the proper measurement range NOTE Make sure the ambient sound level measured is between the range 11 Selecting the weighting mode A mode To measure the sound level within the h2. Dawson DSM141 Digital Sound Level Meter User s Manual Kai gem Den sing 80 Mg TABLE OF CONTENTS LIMITED WARRANTY AND LIMITATION OF LIABILITY ss 3 Out of the BO siss ka 3 A GCESSOFIES dissa Safety Information Certification ense INTRODUCTION eee 7 OVERVIEW see deed netstat hie avin dln ies 7 Figures and Components en 7 Buttons and Components 7 Display Description annen 9 USING THE METER ee PreparatiOn nanne nene vene ne neve nenenenn Backlight eenen Sound Level Measurement dB Basic Functions rr Selecting the weighting mode FAST and SLOW mode Sound Units ddr 12 Maximum Value 13 SPECIFICATIONS aaan nonenenennen 13 MAINTENANCE AND REPAIR TO 610 AOE EEA A E AA E EASE Meter Calibration anneer Replacing Batteries CONTACT DAWSON onee FEATURES issi LIMITED WARRANTY AND LIMITATION OF LIABILITY This instrument from Dawson Tools Inc will be free from defects in workmanship and material for three years from the date of original purchase This warranty does not cover defects resulting from damage caused by the user such as drops neglect misuse unauthorized alteration usage outside of specified conditions contamination or improper repair maintenance To receive service on the instrument if it becomes necessary during the warranty period contact your nearest Dawson authorized service center at 800 898 6991 or visit www DawsonTools com t
3. ensure extended life of the Meter Use only the batteries indicated in the Technical Spec Avoid exposing batteries to humidity Replace batteries as soon as the low battery indicator appears Please keep the original packing for future shipping purposes ex Calibration After opening the box check for any damage during delivery Safety Symbols on the Meter A Important safety information please refers to the user manual A Important Safety Information Repair or maintenance should be implemented by trained personnel Certification e CE The Meter is compiled to EMC requirements H IEC651 Type 2 This meter has meet IEC651 Type 2 Sound level Meter standard H ANSI SL A Type2 This meter has meet ANSI 1 4 Type2 Sound level Meter standard Introduction Overview The DSM141 is a basic portable multifunction digital sound level meter It measures ambient sound level ranging from 30dB to 130dB with frequency range of 30Hz 8 kHz Figures and Components Buttons and Components LCD Liquid Crystal Display Power Button HOLD Button A C Button Panel Backlight Button Fast Slow Button dB SONE Button Maximum Button 0 200 OY SOR eB CIN eg n o Up Down Button KA Microphone Front Panel O wn CH Display Description FAST SLOWI See B8 udin 88 wi Ro UNDER MAX MIN OVER OO D ELEN De Display symbols Description
4. g Batteries Follow these steps to replace batteries 16 Turn off the Meter Loosen the battery compartment door screw and remove the door from the case bottom Remove the batteries and replace the batteries with new batteries Reattach the battery compartment door to the case bottom and tighten the screw Reattach the battery compartment door to the case bottom and tighten the screws Contact Dawson Dawson Tools Inc 1142 S Diamond Bar Blvd 858 Diamond Bar CA 91765 Phone 310 728 6220 www DawsonTools com X Do not recycle 17 Back page Features LCD Display Auto and manual Range Auto Power Off MAX MIN Display Decibel SONE Back Light Data Hold Low Battery Indicator 18
5. ment range 30 80 dB 40 90 dB 50 100 dB 60 110 dB 70 120 dB 80 130 dB 6 ranges in total Automatic shifting microcomputer will automatically select the best gear level in the range from 30 to 130 dB Below or above limit prompt indicated by UNDER or OVER Power supply 4x 1 5V AAA Operating temperature 32 F to 104 F 0 40 C Operating humidity 10 80 RH Storage temperature 10 F to 140 C 10 60 F Storage humidity 10 70 RH Outside measurement 7 6 L x 2 4 W x 1 14 H 193 L x 60 W x 29 H mm Weight about 7 oz 200 g including batteries Maintenance and Repair Repair Please follow these steps closely if the Meter is not functioning properly 15 Check batteries replace with new batteries if low battery indicator E appears Follow User s Manual to confirm all procedures Before sending Meter back for repair include a description of the problems encountered Remove batteries and pack Meter well to avoid damage in delivery Dawson does not cover damage due to delivery Repair or service not covered in this manual should be performed only by the authorized service center or qualified personnel Meter Calibration After sound level meter have been used extensively the measurement accuracy may be reduced over the time the Meter should be calibrated once a year A standard sound source is required for calibration Please contact Dawson for more details Replacin
6. o obtain a return authorization within the US only A return authorization is necessary before returning any instrument to Dawson no service will be provided without a return authorization The user is responsible for properly packing the unit and charges such as shipping freight and insurance charges The extent of Dawson s liability is limited solely to the repair replacement of the instrument The above warranty in its entirety is inclusive and no other warranties written or oral are expressed or implied Out of the Box Check the Meter and accessories thoroughly before using the Meter Contact your local distributor if the Meter or any components are damaged or malfunction 3 Accessories z Microphone cover 1pc 1 5 AAA Batteries Apc Case 1pc User s Manual Safety Information WARNING TO REDUCE THE RISK OF FIRE ELECTRICAL SHOCK PRODUCT DAMAGE OR PERSONAL INJURY PLEASE FOLLOW THE SAFETY INSTRUCTIONS DESCRIBED IN THE USER MANUAL READ THE USER MANUALS BEFORE USING THE METER A WARNING TO ENSURE SAFE OPERATION AND LIFE OF THE METER DO NOT PLACE THE METER IN ANY ENVIRONMENT WITH HIGH PRESSURE HIGH TEMPERATURE DUST EXPLOSIVE GAS OR VAPOR Avoid shaking dropping or any kind of impacts when using or transporting the Meter To avoid electric shock or personal injury repairs or servicing not covered in this manual should be performed only by qualified personnel Avoid direct exposure to sunlight to
7. uman audible range select A weighting mode simulates the hearing characteristics of human ears This is the default mode C mode MN Press the A C key to select C mode C is displayed on the right side of the screen MN To measure the actual sound level select C weighting mode Press the A C key to return to A mode FAST and SLOW mode MN To read real time sound level select FAST high speed To obtain the average sound level select SLOW low speed Press FAST SLOW key to select FAST or SLOW Sound Units MN Press dB SONE to choose between dB decibel or SONE 12 Maximum Value To obtain the maximum sound level press MAX to have maximum sound level displayed Press MAX key again to return to the normal measurement mode Specifications 13 Microphone type polarized capacitive microphone Sound pressure accuracy 1 5 dB sound pressure standard 94 dB 1 KHz Sound pressure frequency response 30Hz 8 KHz Dynamic range of sound pressure 50 dB for each measurement gear level Sound pressure measurement scope 30 130 dBA 35 130 dBC Sound pressure frequency weighting characteristics A and C Dynamic characteristic of sound pressure FAST 125ms SLOW 1sec Digital display 4 digit resolution 0 1 dB sampling rate 2 times sec Analog bar display Each analog bar represents 1 dB sampling rate is 20 times sec 14 Measure
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