Extech Instruments 407740 User Manual

Digital sound level meter

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User's Guide

Digital Sound Level Meter

Model 407740

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.

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Page 1 Model 407740 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...
Page 2: Specifications
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.
Page 3 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. Model 407740 version 1.6 8/05...
Page 4: Battery Replacement
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.