Extech Instruments 407706 Manuale utente

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

1Microphone 2Range switch

3MAX HOLD switch 4SLOW FAST switch

5A/C weighting switch 6Meter

7Battery compartment (rear) 8AC 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.

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.

Setting the Range

Start with the highest range setting (120 dB) and work downward in range using the Rotary Switch until

there is significant deflection of the meter's pointing needle. For greatest accuracy, always use the lower of

any two possible settings. For example: If the RANGE is set to 80 dB and meter reads approx. -5, reset the

RANGE to 70 dB and the meter will read +3, for actual sound level of 73 dB.

Max Hold

Maximum Hold permits the user to freeze the meter's maximum reading by locking the needle indicator at

the sound level peak. Press the Max. button to activate Max. Hold. Press again to release.

Low Battery Indication

Place the Rotary Select switch to the 'BAT' position and observe the analog pointer for status of the battery

voltage. Replace the battery when the pointer indicates a weak battery. Remove power to the meter

whenever it is not being used to preserve battery life.

Analog Output

A Phono-type 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 logging purposes.

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).

Battery replacement

Remove the battery compartment cover on the rear of the meter by removing the cover screw. Replace 9V

battery and compartment cover.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For periodic

calibration, NIST certification or repair of any Extech product, call customer service for details on services

available. Ex tech recommends that calibration be performed on an annual basis to insure calibration

integrity.

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

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. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is

responsible for shipping charges, freight, insurance and proper packaging 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 consequential damages.

Extech's total liability is limited to repair or replacement of the product.

The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

in whole or in part in any form.

407760 V1.2 10/00

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