User's Guide Digital Sound Level Meter
Contents
1. Storage temperature 20 to 60 C 4 to 140 F Dimensions weight 230 x 57 x 44mm 9 x 2 3 x 1 7 172g 60z Copyright 2014 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form www extech com 5 407730 en EU_V1 9 7 142. B level exceeds the range of the meter or the range of a selected range HI will appear in the display If the measured dB level is lower than the selected range LO will appear in the display 1 Press the RNG button to manually select the range MANU will be indicated on the display The four ranges are 40 70 60 90 80 110 and 100 130 Press the RNG button to step through the ranges 2 Press and Hold the RNG button for 2 seconds to exit the manual range mode MAX HOLD In this mode the meter only updates the LCD when a higher reading than the one presently on the display is detected 1 Press the MAX HOLD button to enter the Max Hold mode The MAX HOLD icon will appear in the display 2 Press the MAX HOLD button again to exit this mode 3 407730 en EU_V1 9 7 14 MAXMIN Recording In this mode the meter records the Maximum and Minimum readings and stores them into memory 1 Press the REC button to enter the RECORD mode The REC icon will appear in the display 2 Press the REC button again to display the minimum value recorded since the mode was entered The MIN icon will appear in the display The meter is not recording during this time 3 Press the REC button again to display the maximum value recorded since the mode was entered The MAX icon will appear in the display The meter is not recording during this time 4 Press the REC button again to display the present dB level and continue r
3. EXTECH User s Guide INSTRUMENTS Digital Sound Level Meter Model 407730 Introduction Congratulations on your purchase of the Extech 407730 Digital Sound Level Meter The 407730 measures and displays sound pressure levels in dB from 40 to 130dB User selectable features include Frequency Weighting A and C Response Time Fast and Slow Max Hold and Max Min recording Careful use of this meter will provide years of reliable service Meter Description Microphone LCD Display ON OFF button A C weighting selection button Min Max Record button Range selector button F S response selection button 407730 Max Hold selector button FAST Calibration adjustment G00 O Os AQ OW ABS Jr IN a gt AC analog output jack Windscreen Record icon Auto or Manual range 7 8 9 10 Range indicator 1 Bargraph REC MAX HOLD MIN FAST SLOW 6 A or C weighting AUTO Low bat icon manu E l E m 5 A Max level indicator L E Hold indicator 3 SPL JER Min indicator 4 To a Pe Fast or Slow weighting 20 dB display 2 2oONnNoahon O 2 407730 en EU_V1 9 7 14 Operation 1 Power the meter 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 away from the body 3 View the measurement on the meter
4. e end of its lifecycle Tripod Mount A camera tripod mount is located on the rear of the meter for increased stability and elimination of body reflections 4 407730 en EU_V1 9 7 14 Measurement Considerations 1 Wind blowing across the microphone increases the noise measurement Use the supplied windscreen to cover the microphone when applicable 2 Calibrate the instrument before each use if possible Especially if the meter has not been used for a long period of time 3 Do not store or operate the instrument in areas of high temperature or humidity 4 Keep meter and microphone dry 5 Avoid severe vibration 6 Remove the battery when the meter is to be stored for long periods of time Specifications Display LCD with bargraph Microphone 10mm 0 5 Electret condensor Measurement Bandwidth 300Hz to 8KHz Measurement Range 40 to 130dB A wtg 45 to 130dB C wig Frequency weighting A and C selectable Accuracy Resolution 2dB 1kHz under reference conditions 0 1dB Response time Fast 125 milliseconds Slow 1 second Calibration source 1KHz sine wave 94 or 114dB AC output 0 707Vrms full scale Power 4 AAA Batteries Battery life 30 hours typical low battery indicator alerts user Automatic power off After approx 20 minutes Operating temperature 0 to 50 C 32 to 122 F Operating humidity 10 to 90 RH
5. ecording 5 Press and hold the REC button until the REC icon clears to exit the mode Auto Power Off The meter will automatically shut off after 20 minutes of operation To disable this feature 1 With the meter OFF Press the and MAX HOLD buttons simultaneously 2 P will appear in the display 3 Release the O button and then release the MAX HOLD button 4 The meter will remain on until the power button is pressed Calibration To calibrate the meter an external calibrator such as the Extech 407744 or the Extech 407766 is required in addition to a small screw driver 1 Turn the meter ON 2 Select the 80 to 110dB range 3 Select A weighting and SLOW response 4 Place the microphone into the calibrator Set the calibrator to output a 1kHz sine wave 94dB 5 Adjust the calibration potentiometer for a display as close as possible to the calibrator s output Battery Replacement When theq__fl low battery icon appear replace the battery by removing the screw securing the rear battery compartment and replacing the 4 AAA batteries You as the end user are legally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at th
6. s display If the meter is in the autoranging mode the display may briefly indicate HI or LO if the noise level is above or below the currently selected range The meter will change the range as needed to display the dB level 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 C weighting is a much flatter response and is suitable for the sound level analysis of machines engines etc A or C icons will appear in the display Most noise measurements are performed using A Weighting and SLOW Response FAST and SLOW Response Time Use the F S 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 FAST or SLOW icons will appear in the display Select Slow response for most applications Auto or Manual Ranging The meter will turn on in the auto ranging mode and AUTO will be indicated on the display In this mode the meter will automatically select the best range for the noise level being measured If the measured d
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