Extech Instruments 407744 User manual

User Manual

Model 407744 and 407766

Sound Level Calibrators

Additional User Manual Translations available at www.extech.com

407744 & 407766-en-GB_v5.411/17

Introduction

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

accommodate Sound Level Meters with a 0.5” microphone. 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.

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

407744 & 407766-en-GB_v5.411/17

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.

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.

Battery Check

On the 407744, check the condition of the battery by moving the function switch to the ‘Battery test’

position. The Battery status LED should illuminate if the battery is OK. If it does not light, replace the

9V battery. On the 407766, the POWER-ON / LOW-BATTERY LED glows brightly when the battery

is fresh and dimly when the battery is weak.

Battery Replacement

Lift off battery compartment cap (shown in the Description section) to access the two (2) 9V

batteries. Remove the batteries and replace with new alkaline 9V batteries. Replace the cap.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate

collection sites, the retail store where the batteries were purchased, or wherever

batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

407744 & 407766-en-GB_v5.411/17

Specifications

Output signals 407744: 94dB

407766: 94dB and 114dB

Output signal accuracy 407744: ± 0.5dB;

(@ 23±5°C) 407766: ± 0.5dB (94dB), ±0.8dB (114dB)

Output signal frequency 1 KHz sine wave

Accuracy of output signal frequency ± 5%

Compatible microphones size 0.5” microphones

Total Harmonic Distortion (THD) <2%@94dB (407744 and 407766)

<5%@114dB (407766)

Operating temperature 0 to 50°C (32 to 122°F)

Power supply Two (2) 9V batteries

Power consumption Approx. 10mA DC

Battery check Status LED

Dimensions 50 x 145mm (2.0” diameter x 5.7” length)

Weight 340g (0.75 lbs.)

Standards meets IEC 60942 1997-11 class 2

Standards Meets IEC 60942 1997-11 class 2

www.extech.com

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