User manual

407790A-en-US_v2.0 8/16
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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.
