Instruction Manual - Cole
Contents
1. Extech specifically 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 Copyright 2000 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 407727 V1 2 10 002. User s Manual EXTECH Model 407727 Digital Sound Level Meter Introduction Congratulations on your purchase of Extech s Digital Sound Level Meter This professional meter with proper care will provide years of safe reliable service Specifications Measurement ranges Auto range from 40 to 130dB A Weighted Dee all Auto range from 45 to 130dB C Weighted 160ms LCD 40ms bargraph Time weighting Fast Slow Response selectable Frequency weighting A and C weighting selectable Analog output AC 0 707Vrms Microphone type Condenser Electret Meter powered by 9V battery 120 hour battery life Dimensions Weight 2 7x7 1x1 4 68 x 180 x 36mm 5 1 oz 160g Front Panel Description Microphone LCD Display Analog Bargraph Display ON OFF key Range key A C Weighting selection key Min Max Record key Fast Slow selection key Maximum Hold activation key OAN OAR O N gt Note Battery compartment and Tripod mount are on the rear of the meter The Analog output jack is located on the left side of the meter Operation LCD Display with Analog Bargraph Sound levels are displayed both digitally and in bargraph format When the ON OFF key is pressed to power the meter the LCD will display all characters and then it will count down to zero After countdown the meter dipslays sound pressure levels SPL in units of dB Point the microphone toward the source of the sound being measured and
3. ample most hearing conservation or OSHA related testing is done using SLOW and A weighting Maximum Hold Press the Max Hold key to display the maximum reading during the measurement period In the Max position the LCD will hold the highest reading measured and will update only if a higher reading is measured The bargraph will continue normal measurements Press the key again to return to normal operation Low Battery Indication If the low battery icon BAT appears on the display replace the 9V battery as soon as possible See the battery replacement section for further information Analog Output A 3 5mm phono output jack is provided on the meter for connection to external test equipment An AC rms voltage is provided 0 707V maximum which is a linearized representation of the analog pointer reading Connect this output to a datalogger chart recorder etc for datalogging purposes Data Recording To begin recording the MIN and MAX sound level readings press the RECORD key REC will appear on the LCD To recall the stored minimum reading press the RECORD key again MIN will appear on the LCD along with the recorded measurement data To view the stored maximum reading press RECORD again To resume normal meter operation press RECORD key a final time NOTE The bargraph displays continues to work while in the Data Recording mode Auto Power Off The meter automatically shuts down after 20 minutes of non use to preserve battery life To
4. override this feature press the ON OFF and MAX HOLD keys simultaneously from a power off condition When the display appears release only the MAX HOLD key a lower case n will appear on the LCD Now Release the ON OFF key Note The Auto Power Off feature will be re activated the next time the meter is manually powered down Battery replacement Remove the battery compartment cover on the rear of the meter by removing the cover screw Replace 9V battery and compartment cover Typical A Weighted Sound Levels Subway 20 90dB Night residential area 42dB Freight train 100 80dB Whisper 5 32dB Vacuum cleaner 10 72dB Sound studio 24dB Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and wakmanship for one year from date of shipment a six month limited warranty applies on 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 for authorization 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
5. read the measurement on the LCD Auto and Manual Ranging The default mode of operation is Auto Range To manually select a range press the RANGE key MANU will appear on the LCD Press the RANGE key until the desired range is displayed Note that the two digit number to the left of the bargraph changes to reflect the new range Tripod Mount A threaded insert on the rear of the meter permits attachment to a tripod stand for increased stability and accuracy eliminates hand noise and minimizes the effects of sound reflected from the user s body Weighting A C Press the Weighting key to select A or C weighting The LCD will reflect which weighting mode is currently selected Use A weighting to have the meter respond as the human ear would with regard to frequency response the human ear boosts and cuts amplitude over the frequency spectrum therefore it is not flat responding A weighting is used for environmental measurements OSHA regulatory testing law enforcement and workplace design Select C weighting for a flatter response measurement especially for lower frequencies C weighting is suitable for the sound level analysis of machines engines etc Fast F and Slow S Response Press the Fast or Slow key to select the response The LCD will reflect the currently selected mode Selection of Fast or Slow is determined by the application and any directives or standards related to that application For ex
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