User Manual
Model
407744 and 407766
Sound Level Calibrators
Additional User Manual Translations available at
www.extech.com
Page 1: ...User Manual Model 407744 and 407766 Sound Level Calibrators Additional User Manual Translations available at www extech com ...
Page 2: ...gedness 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 Microphone adaptor 2 407766 OFF 94dB 114dB switch 407744 OFF BATTERY TEST 94dB switch 3 407766 POWER ON LOW BATTERY status LED 4...
Page 3: ...ting 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 positi...
Page 4: ... 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 Copyright 2017 FLIR Systems Inc All rights...
