Extech Instruments 407790A, User Manual

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1. Introduction
Congratulations on your purchase of the Extech 407790A Real Time Octave Band
Analyzer. This auto ranging Type 2 integrating sound level meter features 1/1 and 1/3
Octave Band real-time noise analyses. The 407790A offers five measurement
parameters: SPL (Sound Pressure Level), Leq (Equivalent Continuous Sound Pressure
Level), SEL
(Sound Exposure Level), Lmax (Maximum Sound Pressure Level), and Lmin
(Minimum Sound Pressure Level). The built-in memory stores 12,280 data records in
sound level mode and 1024 records in Octave mode. The stored data can be easily
transferred to a PC with the 407790A software and USB cable. This meter permits
choice of ‘A’, ‘C’, or Flat ’Z’ weighting and Slow / Fast /impulse response times. AC and
DC analog output signals are available for chart recorders and other external recording
devices. Careful use of this device will provide years of reliable service.