Extech Instruments 407744 User Manual

Sound level calibrators

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User's Manual

Model 407744 and 407766

Sound Level Calibrators

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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Page 1 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Back to the Extech 407744/407766 Page User’s Manual Model 407744 and 407766 Sound Level Calibrators Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176...
Page 2: Specifications
Congratulations on your purchase of Extech’s Sound Level Calibrator. Extech Calibrators accommodate Sound Level Meters with 0.5” and 1” microphones. 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.
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.

407766