Extech Instruments 407744 User manual

User’s Manual

Model 407744 and 407766

Sound Level Calibrators

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

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407744/407766 Page

Page 2 Models 407744 & 407766 - Version 5.0 - May2005

Introduction

Congratulations on your purchase of Extech’s Sound Level Calibrator. Extech Calibrators

accommodate Sound Level Meters with 0.5” and 1” microphones. The Calibrator’s die-cast

aluminum housing is built for ruggedness and durability. The 407744 provides a 94dB

calibration output signal while the 407766 provides both 94dB and 114dB outputs. This

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

Specifications

Output signals 407744: 94dB

407766: 94dB and 114dB

Output signal accuracy 407744: ± 0.5dB;

407766: ± 0.5dB (94dB), ±0.8dB (114dB)

Output signal frequency 1KHz sine wave

Accuracy of output signal frequency ± 5%

Compatible microphones sizes 0.5” and 1” microphones

Total Harmonic Distortion (THD) <2%@94dB, <5%@114dB (407766)

Operating temperature 32 to 122oF (0 to 50oC)

Power supply Two (2) 9V batteries

Power consumption Approx. 10mA DC

Battery check Status LED

Dimensions 2.2” diameter x 5.7” length (50 x 145mm)

Weight 0.75 lbs. (340g)

Page 3 Models 407744 & 407766 - Version 5.0 - May2005

Description

Note that only the 407766 is pictured.

1. ½” Microphone adaptor *

2. 407766: OFF-94dB-114dB switch

407744: OFF-BATTERY TEST-94dB switch

3. 407766: POWER-ON / LOW-BATTERY status LED

407744: BATTERY OK LED

4. Battery compartment cap

* To remove the ½” adaptor, pull straight down

as shown in diagram below.

Operation

Theory of Operation

The 407744 sound level calibrator generates a 94dB sine wave at 1 KHz. The 407766

generates a 94dB and a 114dB sine wave at 1kHz. When a microphone from a sound level

meter is inserted into the calibrator, the sound level meter picks up the signal and displays

the signal in dB (decibel) units. The sound level meter should be adjusted (if necessary) to

match the calibrator’s output signal as closely as possible (see diagram).

Procedure

1. Insert the microphone into the calibrator’s microphone cavity as shown; ensure that it is

fully inserted. Use the ½” microphone adaptor (supplied attached to

the calibrator) for ½” microphones. Remove the adaptor (remove as

shown in the Description section) for 1” microphones.

2. On the 407744, slide the function switch to the ‘I’ (Power On) position.

As soon as the unit is powered, the calibration tone is generated. On

the 407766, slide the function switch to the 94dB or the 114dB

position as desired. The calibrator generates its signal as soon as the

switch is set.

3. Read the sound level meter’s display. The sound level meter should

read 94dB or 114dB depending on the calibrator’s setting. If the sound

level meter does not match the calibrator’s signal (within

specification), adjust it as explained in the Operation section (typically

a front or side-panel pot adjustment). Refer to diagram at right.

4. Slide function switch to the OFF position, and remove the microphone.

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

FAX 781.665.0780 - TestEquipmentDepot.com

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