Introduction - Extech Instruments 400790A User Manual

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.
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