Related Manuals for Extech Instruments 407744
Summary of Contents for Extech Instruments 407744
- Page 1 User Manual Model 407744 and 407766 Sound Level Calibrators Additional User Manual Translations available at www.extech.com...
- Page 2 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.
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Page 3: Battery Replacement
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. -
Page 4: Specifications
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.