407736 V2.0 5/08

2

Introduction

Congratulations on your purchase of the Extech Model 407736 Digital Sound Level Meter.

This meter is shipped fully tested and calibrated and, with proper use, will provide years of

reliable service.

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.

1

2

35

4

7

8

9

6

Lo = 35 ~ 100dB

HI = 75 ~ 130dB