Extech Extech 407736-NIST Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Digital Sound Level Meter

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407736 Product Page

• 1.5 dB accuracy meets ANSI and IEC 651
Type II standards

• A/C weighting & Fast/Slow response

• Built-in calibration check

• 0.1dB resolution

INTRODUCTION

Congratulations on your purchase of the Extech Model 407736 Digital Sound Level Meter.
This professional meter, with proper care, will provide years of safe reliable service.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

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 90; High: 75 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

AC Analog output

DC Analog output

0.65VAC rms (full scale); 600Ω output impedance

10mVDC / dB; 100Ω output 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.

407736 Ver. 1.4 January 2002

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