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Summary of Contents for Extech Instruments 407744
- Page 1 User Manual Model 407744 and 407766 Sound Level Calibrators GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 2 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.
- Page 3 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.
- Page 4 1 KHz sine wave Accuracy of output signal frequency ± 5% Compatible microphones size 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.
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