Extech Instruments 407790A, User Manual

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407790A-EN_V2.4 1/20
1.2 Features
The Sound Level Meter complies with the requirements of IEC 61672-1:2003 standard for a
Class 2 instrument. See specifications section for more applicable standards that apply to this
meter.

1/1 octave band analysis from 31.5Hz to 8kHz

1/3 octave band analysis from 25Hz to 10kHZ

Can perform 1/1 and 1/3 octave band analysis simultaneously

4GB Micro SD card

USB interface

Datalogging function

AC/DC signal output available for level and graphic recorder

Comparator output function

External trigger input function

Real time clock with calendar

Main channel (sound meter, analyzer mode)

Sub Channel (sound level meter mode)
The 407790A allows the following quantity measurements.
Simultaneous measurements of all items with selected time weighting and frequency
characteristics.

Sound level Lp

Equivalent continuous sound Leg

Sound exposure level SEL

Maximum sound level Lmax

Minimum sound level Lmin

Percentile sound level L N (L05, L50, L90, L95) calculated from Lp

Frequency rating A, C, Z

Time weighting
Main Channel
Fast, Slow, 10ms, impulse
Sub Channel Fast, Slow, 10ms, impulse
Safety Symbol: Complies with EMC