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407750-EN v2.2 07/13
2
Introduction
Congratulations on your purchase of the Extech 407750. This device measures sound level in dB
and the measurement range can be set automatically or manually. The 407750 offers selectable
frequency weighting (‘A’ and ‘C’) and Time Response (Fast and Slow). The built-in RS-232 PC
interface allows the user to record readings onto a PC in real-time. Careful use of this meter will
provide years of reliable service.
Specifications
Display Backlit 2000 count LCD with analog bargraph
Display update rate Main LCD digits: 0.5 seconds; Bargraph: 50mS
Analog Bargraph 1dB steps with 50dB display range
Microphone Electret condenser (0.5” diameter)
Measurement Bandwidth 31.5Hz to 8KHz
Measurement Range A weighting: 30 to 130dB; C weighting: 35 to 130dB
6 ranges in 10 dB steps: 30 to 80dB, 40 to 90dB, 50 to
100dB, 60 to 110dB, 70 to 120dB, 80 to 130dB
Accuracy / Resolution ± 1.5dB / 0.1dB
Time response selections Fast (125ms) and Slow (1 second)
AC and DC Analog outputs 0.707VAC rms at full scale; 10mVDC / dB;
3.5mm output jacks
Standards Meets ANSI and IEC Type 2
External Calibrator Extech models 407766 or 407744
Power 9V Battery; 20 hour battery life (typical) with low battery
indication
Dimensions/weight 3.2 x 10.1 x 1.5” (80 x 256 x 38mm) / 8.5 oz. (240g)