407706 Datasheet, PDF (1/2 Pages) Extech Instruments Corporation. – Analog Sound Level Meter

User’s Manual
Model 407706
Analog Sound Level Meter
Introduction
Congratulations on your selection of the Extech Analog Sound Level Meter, a versatile
device that measures sound pressure level in any acoustic environment. Sound/Noise
Levels that are high or low volume, 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
Resolution
Accuracy
Microphone type
Analog output
Meter power
Dimensions/Weight
54 to 126dB in 7 ranges (referenced to 0.00002 bar)
Analog Continuous
±2 dB @1kHz at 94 dB sound level
Condenser Electret
AC: 0.707Vrms (full scale)
9V battery (120-hour battery life)
2.7 x 7.1 x 1.4" (68 x 180 x 36mm) / 5.1 oz. (160g)
Front Panel Description
1 Microphone
2 Range switch
3 MAX HOLD button
4 SLOW/FAST switch
5 A/C weighting switch
6 Analog display
7 Battery compartment
8 AC analog 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 flat response
(especially at lower frequencies). ‘C’ weighting is suitable for the sound level analysis of
machines, engines, etc.
Fast (F) and Slow (S) Response
Slide the Fast or Slow switch to select the response. Selection of Fast or Slow is
determined by the 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.