Extech 407766 Bedienungsanleitung
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User Manual
Model and 407766 407744
Sound Level Calibrators
Addional User Manual Translaons available at www.extech.com
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Introduction
Congratulations on yo Extech Calibrators ur purchase of Extech’s Sound Level Calibrator.
accommodate Soun microphone die-cast aluminum d Level Meters with a 0.5” . The Calibrator’s
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
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Operation
Theory of Operation
The sound level calibrator generates a 94 sine wave at 1 KHz. The generates a 407744 dB 407766
94dB and sine wave at 1kHz. When a microphone from a sound level meter is inserted into a 114dB
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 microphone cavity as showncalibrator’s ;
ensure that (supplied it is fully inserted. Use the ½” microphone adaptor
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 . The sound level meter should read sound level meter’s display
94dB or 114dB depending on the . If the sound level calibrator’s setting
meter does not match the calibrator specication), adjust it ’s signal (within
as explained in the Operation section (typically a front or side-panel pot
adjust Refer to diagram at right. ment).
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 o 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.
Safety: Please dispose of batteries responsibly; never dispose of batteries in a re, batteries may
explode or leak. If the meter is not to be used for 60 days or more, remove the battery and store
separately.
Produktspezifikationen
| Marke: | Extech |
| Kategorie: | Messung |
| Modell: | 407766 |
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