User`s Guide Digital Sound Level Meter Model 407740
Contents
1. 1 Microphone 2 LCD Display 3 Calibration potentiometer Note Adjust pot only while using an acoustic Calibrator 4 Selector Switches 5 Maximum Hold reset button 6 Analog output jack The battery compartment and tripod mount are located on the rear of the instrument Sound Lavel Meter Operation Powering the Meter and Configuring the Analog Output Slide the POWER switch to the ON DC or ON AC position The AC or DC determines the type of signal present at the analog output jack Basic Measurements Point the microphone toward the source of the sound to be measured The meter can be held in hand or mounted on a tripod tripod mount on rear of instrument The meter will now display the sound level in dB Selecting A or C Weighting Use the Weighting selector switch to select A or C frequency weighting Use A weighting to have the meter simulate the response of the human ear the human ear boosts and cuts sound levels at specific points over the frequency spectrum A weighting is used for environmental measurements OSHA regulatory testing law enforcement and workplace design Select C weighting for flat response measurements the readout does not boost or dampen the measurement across the frequency spectrum C weighting is suitable for the operational maintenance and analysis of machinery motors pumps engines etc Selecting FAST or SLOW response Use the RESPONSE s2. CE gt e 28 a 3B z 8cB 3cB as 28 Typical A Weighted Sound Levels 88 dB 40 SOHP Siren 100 30 Jet takeoff 200 20 Riveting machine D 00 Chain saw Subway 20 0 Boiler room Pneumatic drill 50 80 Freight train 100 Vacuum cleaner 10 70 Speech 1 Large store 60 Large Office Small office 0 Residence Night residential area 40 Whisper 5 0 0 o Sound studio 10 0 Threshold of hearing 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 Copyright 2003 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 4 Model 407740 version 1 6 8 05
3. User s Guide EXTECH INSTRUMENTS Digital Sound Level Meter Model 407740 Sound Level Meter EE A AT A A A A E A Introduction Congratulations on your purchase of the Extech 407740 Digital Sound Level Meter This device measures sound in decibels dB Useful features include A C Weighting Fast Slow Response Time and Maximum Reading HOLD 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 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 ext 210 for authorization or visit our website at www extech com click on Contact Extech and go to Service Department to request an RA number 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 specificall
4. witch to select Fast or Slow The setting is determined by the application and any directives or standards related to the application For example most hearing conservation or OSHA related testing is done using the SLOW setting with A weighting To capture quick sound peaks however use the FAST setting Selecting the Measurement Range Select the measuring range using the dB selector switch If the high 4 or low Y indicators appear on the display select a lower range for A or higher range for Y Maximum Hold Function Select MAX HOLD using the RESPONSE selector switch to capture the maximum dB level The meter response will be set to FAST The display will only display the highest reading in this mode To reset the Maximum Hold display press the black reset button on the bottom of the meter next to the analog output jack Calibration Frequent calibration using an acoustic calibrator is recommended Follow the instruction provided with the calibrator 3 Model 407740 version 1 6 8 05 Battery Replacement The low battery indication BAT appears on the LCD when the 9V battery is nearing depletion Reliable readings can be obtained for several hours after the first appearance of the low battery indication To replace the battery slide the battery compartment cover off the rear of the instrument and replace the 9V battery Secure the cover before use Reference Information Frequency Weighting Characteristics
5. y 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 Specifications Display 2000 count multi function LCD Input Signal Range A Weighting 30 to 130dB C Weighting 30 to 130dB Response Time Fast Response 125ms Slow Response 1s Resolution 0 1 dB Standards Compliance ANSI and IEC Type 2 Accuracy at 23 5 C 1 5dB at 1KHz 94dB Frequency 31 5 to 8 000Hz Microphone Electric condenser microphone 0 5 12 7mm Range Selector Switch 30 to 80dB 50 to 100dB 80 to 130dB External Calibrator Use Extech model 407744 or 407766 Analog Output Signal AC 0 5Vrms full scale of selected range DC 0 3 to 1 3VDC 10mV dB Analog output impedance 600 ohms Analog Output Terminal 3 5mm phone jack Operating Temperature 32 F to 122 F 0 C to 50 C Operating Humidity Max 90 RH 0 to 35 C Power Supply 9V battery Dimensions Weight 10 x 2 8 x 1 1 255 x 70 x 28mm 10 oz 280 g Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com 2 Model 407740 version 1 6 8 05 Meter Description
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