Extech Instruments 407727 User Manual Download | Manualshive

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User’s Manual

Model

407727

Digital Sound Level Meter

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Summary of Contents for 407727

Page 1: ...User s Manual Model 407727 Digital Sound Level Meter ...

Page 2: ...o range from 45 to 130dB C Weighted Resolution 0 1 dB Accuracy 2 dB at 94 dB sound level Display 3 1 2 digit LCD with analog bargraph Display update rate 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 Power Meter powered by 9V battery 120 hour battery life Dimensions...

Page 3: ...splay 4 ON OFF key 5 Range key 6 A C Weighting selection key 7 Min Max Record key 8 Fast Slow selection key 9 Maximum Hold activation key 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 ...

Page 4: ... 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 ...

Page 5: ... application and any directives or standards related to that application For example 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 ...

Page 6: ... 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 override this feature press the ON...

Page 7: ...tery and compartment cover Typical A Weighted Sound Levels 50HP Siren 100 135db Speech 1 68dB Jet Takeoff 200 120dB Large store 62dB Riveting machine 110dB Large office 58dB Chain saw 100dB Residence 48dB Subway 20 90dB Night residential area 42dB Freight train 100 80dB Whisper 5 32dB Vacuum cleaner 10 72dB Sound studio 24dB ...

Page 8: ...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 specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or cons...

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