Specifications - Extech Instruments 407790 User Manual

Introduction
Congratulations on your purchase of the Extech 407790 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 analysis. The 407790 offers five measurement parameters:
SPL (Sound Pressure Level), Leq (Equivalent Continuous Sound Pressure Level), L
(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 supplied software and RS-232 cable. This meter permits choice of 'A', 'C', or
'Flat' weighting and 'Slow' / 'Fast' 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.

Specifications

Applicable Standards: IEC 60651 type2, 60804 type 2, ANSI S1.4 type2, IEC 1260 (1995)
Display: Backlit LCD (160×160 dot matrix)
Sound level meter mode:
Numeric display: 4 digits; Update rate: 0.5 seconds; Resolution: 0.1 dB
Bar graph display: 100dB range; Update rate: 0.125S; Resolution: 1dB
Frequency analysis mode:
Numeric display: 4 digits; Update rate 0.5 seconds; Resolution: 0.1dB
Bar graph display: 70dB range; Update rate: 0.125S; Resolution: 1 dB
Accuracy: ±1.5dB (ref 94dB @1kHz)
Measurement Frequency range: 25Hz to 10 kHz
Dynamic range: 100dB (Sound level meter mode); 70dB (Frequency analysis mode)
Measurement range: 30dB to 130dB
Sound Pressure Level range: SLM mode: 100dB (30 to 130dB); Frequency analysis mode:
Frequency weighting: 'A', 'C', 'P' (Flat)
Time weighting (Response Time): Fast and Slow
Microphone: 1/2 inch electret condenser type
70dB (20 to 90dB, 30 to 100dB, 40 to 110dB, 50
to 120dB, 60 to 130dB
2 Model 407790 Ver. 1.1 7/02L
E