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Summary of Contents for Extech Instruments 407727
- Page 1 User’s Manual Model 407727 Digital Sound Level Meter...
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Page 2: Specifications
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) Auto range from 45 to 130dB ('C' Weighted) Resolution 0.1 dB Accuracy... -
Page 3: Front Panel Description
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 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: Operation
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. -
Page 5: Maximum Hold
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. -
Page 6: Analog Output
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). -
Page 7: Battery Replacement
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 50HP Siren (100’) 135db Speech (1’) 68dB Jet Takeoff (200’) 120dB Large store 62dB Riveting machine... -
Page 8: Warranty
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 for authorization.
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