Extech Instruments 407706 User Manual

User’s Manual

Model 407706
Analog Sound Level Meter

Introduction

Congratulations on your selection of the Extech Analog Sound Level Meter, a versatile device which measures
sound pressure level in any acoustic environment. Sound/Noise Levels that are loud or soft, high or low -pitched,
broadband, intermittent, or continuous can easily be measured in factories, schools, offices, airports, sound
studios, theaters, auditoriums, automobiles, and in the home. This precisely calibrated meter features a large,
easy-to-read analog indicator and is battery powered for portable use.

Specifications

Ranges 50 to 126dB in 7ranges of 12dB, referenced to 0.00002 bar
Resolution Analog Continuous
Accuracy ±2 dB at 94 dB sound level
Microphone type Condenser Electret
Analog output AC: 0.707Vrms (@ full scale)
Power Meter powered by 9V battery ;120 hour battery life
Dimensions/Weight 2.7x7.1x1.4" (68 x 180 x 36mm) / 5.1 oz. (160g)

Front Panel Description

1 Microphone 2 Range switch
3 MAX HOLD switch 4 SLOW FAST switch
5 A/C weighting switch 6 Meter
7 Battery compartment (rear) 8 AC output jack

Operation

Weighting A / C

Slide the Weighting switch to select A or C weighting. Use ‘A’ weighting to
have the meter respond as the human ear would with regard to frequency
response (the human ear boosts and cuts amplitude over the frequency
spectrum therefore it is not ‘flat’ 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.