407790 Datasheet, PDF (2/18 Pages) Extech Instruments Corporation. – Real Time Octave Band Analyzer

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 analyses. The 407790 offers five measurement parameters:
SPL (Sound Pressure Level), Leq (Equivalent Continuous Sound Pressure Level), L_E
(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:
70dB (20 to 90dB, 30 to 100dB, 40 to 110dB, 50
to 120dB, 60 to 130dB
Frequency weighting: ‘A’, ‘C’, ‘P’ (Flat)
Time weighting (Response Time): Fast and Slow
Microphone: 1/2 inch electret condenser type
Display warning indicators:
OVER indicator (Input signal exceeds the upper limit)
UNDER indicator (Input signal under the lower limit)
Memory capacity: See Table below (Manual/Auto storage blocks are separate)
Mode
Storage type
Manual
Auto
Sound level meter
1024 data sets
10000 data sets
1/1-octave analysis
1024 data sets
6140 data sets
1/3-octave analysis
1024 data sets
2
3070 data sets
Model 407790 Ver. 2.1 9/07