Extech Instruments 407735 Manual de usuario

User's Guide

Digital Sound Level Meter

Model 407735

Introduction

Congratulations on your purchase of the Extech Model 407735 Digital Sound Level Meter.

This professional meter, with proper care, will provide years of safe reliable service.

407735 Ver. 2.1 04/2006

Specifications

Display 3-1/2 digit (2000 count) LCD

Display update rate 0.5 seconds

Microphone 0.5” Electret condensor

Measurement Bandwidth 31.5Hz to 8KHz

Dynamic range 65dB

Measurement Range 35 to 130dB (Low: 35 to 90; High: 65 to 130dB)

Frequency weighting ‘A’ and ‘C’ (selectable)

Accuracy / Resolution ± 2.0dB @1kHz / 0.1dB

Maximum Hold decay time <1dB / 3min

Response time Fast: 125 milliseconds / Slow: 1 second

Built-in calibration check 1KHz internal sine wave @ 94dB

AC Analog output 0.65VAC rms (full scale); 600Ωoutput impedance

DC Analog output 10mVDC / dB; 100Ωoutput impedance (approx).

Power 9V Battery

Battery life 50 hours (typical); Low battery indicator alerts user

Operating temperature 32 to 104oF (0 to 40oC)

Operating humidity 10 to 90% RH

Dimensions/weight 9.45 x 2.68 x 1” (240 x 68 x 25mm) / 6.75oz (210g)

Meter Description

1. Microphone

2. LCD display

3. POWER OFF & RANGE select switch

4. RESPONSE & HOLD select switch

5. A/C weighting and Calibration switch

6. Calibration adjust screw for 94dB

7. Reset key (resets max hold reading)

8. AC/DC analog output 3.5mm phone jack

9. Battery compartment and Tripod mount are located

on back of meter

Measurement Considerations

1. Wind blowing across the microphone adds extraneous noise to the measurement.

Use the supplied windscreen to cover the microphone when applicable.

2. Calibrate the instrument before each use if possible. Especially if the meter has not

been used for a long period of time.

3. Do not store or operate the instrument in areas of high temperature or humidity.

4. Keep meter and microphone dry.

5. Avoid severe vibration when using the meter.

6. Remove the battery when the meter is to be stored for long periods of time.

407735 Ver. 2.1 04/2006

Operation

1. Power the meter by moving the RANGE switch to the LO or HI position. The meter will

begin displaying sound levels. If the LCD does not display, check that the battery is

good.

2. Place the meter on a tripod or hold the meter in hand facing the microphone toward the

source of the sound to be measured. Note that the tripod mount is on the back of meter.

3. View the measurement on the meter’s LCD. An indication of ‘OVER’ means that the

measurement is out of range. Select another measurement range in the event of an

over-range condition.

‘A’ and ‘C’ Frequency Weighting

Use the FUNCT (function) switch to select ‘A’ or ‘C’ frequency weighting. Use ‘A’ weighting

to have the meter simulate the response of the human ear (the human ear boosts and cuts

sound levels at specific points over the frequency spectrum). ‘A’ weighting is used for

environmental measurements, OSHA regulatory testing, law enforcement, and workplace

design. Select ‘C’ weighting for flat response measurements (no boosting or dampening

across the frequency spectrum). ‘C’ weighting is suitable for the operational maintenance

and analysis of machinery, motors, pumps, engines, etc.

FAST/SLOW Response Time

Use the RESPONSE switch to select FAST (125 ms) or SLOW (1 second) response time.

The application at hand (and any directives or standards) will dictate which response to

select. For example, most hearing conservation or OSHA related testing is done using

SLOW mode and ‘A’ weighting.

MAX HOLD

In this mode, the meter only updates the LCD when a higher reading than the one

presently on the display is detected. Select MAX HOLD using the RESPONSE switch. The

LCD shows ‘MAX HOLD’ in this mode. Press RESET to reset the MAX HOLD reading.

Analog Outputs

The meter includes an AC and a DC analog output for use with chart recorders,

dataloggers, etc. The AC output is 0.65V rms full scale and the DC output is 10mV per dB.

The 3.5mm output jack is located on the right side of the instrument. Use a stereo mini-

plug as shown in the diagram below to connect the meter to a datalogger or other recorder.

Battery Replacement

When the low battery message appears on the LCD replace the 9V battery as soon as

possible. The battery compartment cover resides at the bottom, rear of the meter. Slide

the battery compartment cover off, change the battery, and replace the compartment

cover.

Calibration Check

This meter provides a built-in calibration adjustment. The calibration adjustment

potentiometer is located on the front panel beneath the FUNCT switch. Put the FUNCT

switch to the CAL 94dB position and adjust the potentiometer for a display of exactly

94dB. For calibration with an external sound level calibrator, refer to the instructions

accompanying the calibrator.

Tip: AC Output

Ring: DC Output

Sleeve: Ground

Stereo plug

407735 Ver. 2.1 04/2006

Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

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. 210 for authorization or visit our

website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA

number). 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.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for

most products. Call the Customer Service Department for information on calibration services available for this

product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy.

Typical “A” Weighted Sound Pressure Levels

50HP Siren (100')

130

120

110

100

140

Jet takeoff (200')

dBA

Riveting machine

Chain saw

Subway (20') Boiler room

Pneumatic drill (50') Freight train (100')

Vacuum cleaner (10') Speech (1')

Large store Large Office

Small office Residence

Night residential area

Whisper (5'0) Sound studio

Threshold of hearing

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