Extech Instruments 407736 Manual de usuario

User'sGuide

Digital Sound Level Meter

MODEL 407736

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Introduction

Thank you for selecting the Extech Model 407736. This device is shipped fully tested and calibrated

and, with proper use, will provide years of reliable service. Please visit the Extech Instruments website

(www.extech.com) to check for the latest version of this User Guide.

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 the

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.

Lo = 35 ~ 100dB

HI = 75 ~ 130dB

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Meter Operation

Quick Start

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 per range and the DC output is 10mV per dB per range. 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.

1. Sleeve: ground

2. Ring: DC out

3. Tip: AC out

Calibration Check

Internal 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 switches to the F, Hi, A and

CAL 94dB positions 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.

External Calibration

Attach an external sound level calibrator (1kHz at 94.0dB) completely over the microphone.

Set the meter to F, Hi, and A, and adjust the potentiometer for a display of exactly 94.0dB.

If the internal and external settings are not within 1.5dB of each other, the meter will require an

internal calibration. Contact Extech

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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.

You, as the end user, are legally bound (EU Battery ordinance) to return all used

batteries, disposal in the household garbage is prohibited! You can hand over your

used batteries / accumulators at collection points in your community or wherever batteries

/ accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

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 offic e Residence

Night residential area

Whisper (5'0)

Sound studio

Threshold of hearing

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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 55dB

Measurement Range 35 to 130dB (Low: 35 to 100; High: 65 to 130dB)

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

Applicable standards IEC-651 & ANSI S1.4 Type 2

Accuracy / Resolution ± 1.5dB / 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 signal is electrical

and is injected after the microphone

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

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

Power 9V Battery

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

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

Operating humidity 10 to 90% RH

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

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