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407790A: Real Time Octave Band Analyzer

Type 2 integrating sound level meter with Octave and 1/3 Octave Band real time display

View Datasheet > 407790A


Extech’s Type 2 Integrating Sound Level Meter with Octave and 1/3 Octave Band Real Time is displayed on a large 3.5″ 320×240 TFT color backlit LCD.

Additional information

Applicable standards

ANSI S1.4 Type 2, EN IEC 60651, EN IEC 60804, and EN IEC 1260-1995


±1.5dB (ref 94dB @ 1kHz)

Measurement functions

Lp, Leq, LE, Lmax, Lmin, L05, L10, L50, L90, L95

Frequency range

25Hz ~ 10kHz

Frequency Weighting

A, C, and Z


3.5" (89mm) 320×240 TFT color backlit LCD; Displays 1/1, 1/3, and 1/1 & 1/3

1/1- 1/3 Analyzer level range

5 ranges in 10db steps: 20 to 90dB, 20 to 100dB, 20 to 110dB, 30 to 120dB, 40 to 130dB

1/1 Octave and 1/3 Octave

1/1 Octave band center frequencies: (9 bands); 1/3 Octave band center frequencies: (27 bands)

Signal output

AC output: 1 Vrms (at full scale); DC output: 3.0V, 25mV/dB


microSD card (included)

Measurement Time

1s to 23h 59m 59s


Four type C size 1.5V batteries, External DC power: 6V, 1A


13.6 x 3.9 x 2.4" (345 x 100 x 60mm)/ 33.5oz (950g)

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