Extech 407732 Operating Manual

Digital Sound Level Meter

Model 407732

USER GUIDE

Introduction

Thank you for selecting the Extech Model 407732. 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.

Safety

Read the following safety information carefully before attempting to operate or service the
meter. Use the meter only as specified in this manual; otherwise, the protection provided by
the meter may be impaired.

Environmental Conditions

 Altitude up to 2000 meters

 Relative Humidity: 90% max.

 Operating Temperature: 0 to 40

Maintenance and Cleaning

 Repair or servicing not covered in this manual should only be performed by qualified

personnel.

 Periodically wipe the case with a dry cloth. Do not use abrasives or solvents.

o

C (32 to 104oF)

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Meter Description

1. Microphone

2. 4-digit LCD Display

3. ON-OFF button

4. LCD Backlight button

5. Frequency weighting selection button

6. Response time selection button

7. Range selector button

8. Max Hold / Data Hold selector button

9. Battery compartment on rear

10. Calibration pots in battery compartment

11. Windscreen

Measurement Considerations

1. Wind blowing across the microphone increases the noise 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.

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

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