Extech Instruments 407780A - Calibration Procedure

407780A‐EU‐ENv1.34/14
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Calibration
CalibratingtheIntegratingSoundLevelDataloggerrequiresanacousticalcalibratorsuchasthe
ExtechModel407766or407744.
1. Configurethemeteras follows:
• Display:SPL(dBA)
• Timeweightingmode:FAST
2. Insertthemicrophoneintotheopeningoftheacousticalcalibrator.
3. SwitchthecalibratorON.
4. Adjust
themeter’scalibrationpotentiometerasshowninthe
accompanyingdiagramuntilthemeter’sdisplaymatchesthe
acousticalcalibratoroutputsignal(typically94or114dB).
5. SwitchthecalibratorOFF.
6. Removethecalibratorfromthemicrophonevery slowlytoavoid
damagingthemicrophone.
7. Incaseswhereadjustingthepotentiometer
doesnotaffectthe
displayedreading,orwheretheadjustmentcannotproducethe
appropriatedisplayedreading,pleasereturntheunitforservice.

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