Instruction Manual
Contents
1. by pressing the power button The meter will begin displaying sound level readings If the LCD does not switch on check the 9V battery located in the rear battery compartment 2 Hold the meter in hand facing the microphone toward the source of the sound to be measured 3 View the measurement on the meter s LCD An indication of OVER means that the measurement is out of range Toggle the Hi 65 to 130dB and Lo 35 to 100dB measurement ranges using the HI LO button For measurements in the 65 to 100dB region either range can be used A and C Frequency Weighting Use the A C button to select A or C frequency weighting With A weighting selected the frequency response of the meter is similar to the response of the human ear A weighting is commonly used for environmental or hearing conservation programs such as OSHA regulatory testing and noise ordinance law enforcement C weighting is a much flatter response and is suitable for the sound level analysis of machines engines etc Most noise measurements are performed using A Weighting and SLOW Response FAST and SLOW Response Time Use the F C button to select FAST 125 ms or SLOW 1 second response time Select FAST to capture noise peaks and noises that occur very quickly Select the SLOW response to monitor a sound source that has a consistent noise level or to average quickly changing levels Select Slow re2. 0z 210g T Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com 3 Model 407732 Version 1 4 J une 2004 Meter Description ee 2 te oO ee Ze eS O Microphone 4 digit LCD Display ON OFF button LCD Backlight button Frequency weighting selection button 1 Response time selection button Range selector button Max Hold Data Hold selector button Battery compartment on rear Calibration pots in battery compartment Windscreen INSTRUMENTS 407732 Sound Level Meter Lo 35 100dB CE Hi 65 130dB Me Measurement Considerations 1 a ek ae Wind blowing across the microphone increases the noise measurement Use the supplied windscreen to cover the microphone when applicable Calibrate the instrument before each use if possible Especially if the meter has not been used for a long period of time Do not store or operate the instrument in areas of high temperature or humidity Keep meter and microphone dry Avoid severe vibration Remove the battery when the meter is to be stored for long periods of time 4 Model 407732 Version 1 4 J une 2004 Operation 1 Power the meter
3. Extech 407766 is required in addition to a small screw driver 1 Se he gt Open the battery compartment and locate the two calibration potentiometers behind the 9V battery see diagram Turn the meter ON Put the meter in the A weighting mode Put the meter in the SLOW response mode Place the 407732 microphone into the calibrator Set the calibrator to output a 1kHz sine wave 94dB Put the meter in the low range Adjust the A Lo potentiometer for a display of 94 0 dB Put the meter in the high range CQ catosas C Adjust the A HI potentiometer for a display of 94 0 A HI A Lo dB Weighting eighting Battery Replacement When the low battery icon BAT appears on the LCD replace the 9V battery as soon as possible The battery compartment cover is located on the rear of the meter Remove the Phillips screw to loosen the cover Slide the battery compartment cover off change the battery and replace the compartment cover Typical A Weighted Sound Levels dBA 40 SOHP Siren 100 30 Jet takeoff 200 20 10 Riveting machine 00 Chain saw Subway 20 aia Boiler room Pneumatic drill 50 80 Freight train 100 Vacuum cleaner 10 70 Speech 1 Large store 60 Large Office Small office O Residenc Night residential area 40 Whisper 5 0 Sound studio 10 Threshold of hearing 0 Copyright 2004 Extech Instruments Corporation All rights reserved including the right of reproduction
4. User s Guide EXTECH INSTRUMENTS Digital Sound Level Meter Model 407732 Sound Level Meter Lo 35 100dB CE Hi 65 1300B Introduction Congratulations on your purchase of the Extech 407732 Digital Sound Level Meter The 407732 measures and displays sound pressure levels in dB from 35 to 130dB The LCD is backlit for viewing readings in dimly lit areas User selectable features include Frequency Weighting A and C Response Time Fast and Slow Max Hold and Range High and Low Careful use of this meter will provide years of reliable service Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifica
5. in whole or in part in any form 6 Model 407732 Version 1 4 J une 2004
6. lly disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Safety Read the following safety information carefully before attempting to operate or service the meter Use the meter only as specified in this manual otherwise the protection provided by the meter may be impaired Environmental Conditions Altitude up to 2000 meters Relative Humidity 90 max Operating Temperature 32 to 104 F 0 to 40 C Maintenance and Cleaning Repair or servicing not covered in this manual should only be performed by qualified personnel Periodically wipe the case with a dry cloth Do not use abrasives or solvents Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy 2 Model 407732 Version 1 4 J une 2004 Specifications Display 4 digit 4000 count backlit LCD Dimensions weight 9 45 x 2 68 x 1 240 x 68 x 25mm 6 75
7. sponse for most applications Hi and Lo Range Selections Use the Hi Lo button to select the appropriate range If the measurement is in the range of 35 to 100 dB use the Lo range If the measurement is between 65 and 130dB use the Hi range For measurements between 65 and 100dB either range can be used If the display flashes the OVER icon press the range button to toggle the range MAX HOLD In this mode the meter only updates the LCD when a higher reading than the one presently on the display is detected Select MAX HOLD by momentarily pressing the MAX HOLD button The meter displays the MAX icon when in the MAX HOLD mode Press the MAX HOLD button again to exit this mode the MAX indicator will switch off DATA HOLD To freeze a displayed reading press and hold the MAX HOLD button until the MAX and HOLD display icons appear To release the display and return to the normal operating mode press and hold the MAX HOLD button until the MAX and HOLD icons switch off Au Backlight button The LCD is equipped with backlighting for easier viewing especially in dimly lit areas Press the backlight button to turn the backlight on Press again to turn the backlight off The backlight does not have an automatic power down function judicious use will conserve battery life 5 Model 407732 Version 1 4 J une 2004 Calibration To calibrate the 407732 an external calibrator such as the Extech 407744 or the
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