Extech 407790 Operating Manual
User Manual
Real Time Octave Band Analyzer
Model 407790
FAST
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W A
dB
100
90
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31.5 500
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75.2 dB
8k 2k L W
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
(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:
Measurement Frequency range: 25Hz
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
Display warning indicators:
Memory capacity: See Table below (Manual/Auto storage blocks are separate)
±1.5dB (ref 94dB @1kHz)
OVER indicator (Input signal exceeds the upper limit)
UNDER indicator (Input signal under the lower limit)
Storage type
Mode
to
10 kHz
70dB (20 to 90dB, 30 to 100dB, 40 to 110dB, 50
to 120dB, 60 to 130dB
Manual Auto
E
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 3070 data sets
Model 407790 Ver. 2.1 9/07 2
AC output: 2 Vrms at FS (full scale); Output impedance approx. 600Ω
DC output: 10mV/dB; Output impedance approx. 100Ω
Power: Four (4) C size 1.5V alkaline batteries
External DC power supply: 6 Vdc, 1A
Battery life: Approx. 2 hours
o
Operating Temperature/Humidity: 32 to 104
Storage Temperature/Humidity: 14 to 140
F (0 to 40℃); 10 to 90%RH
o
F (-10 to 60℃); 10 to 90%RH
Environment conditions: Altitude up to 2000 meters
Safety symbol
Complies with EMC
Dimensions & Weight: 13.6 (H) x 4.0 (W) x 2.4 (D)” (34.5 × 10 × 6cm); Approx.33.5 oz.
(950g) including batteries
Accessories: Four (4) C 1.5V batteries, hard-shell carrying case, CD-ROM Windows
software, RS-232 cable, adjustment screw driver, Windscreen, 3.5mm plug, and AC
adaptor
Optional accessories: Microphone extension cable (5m or 10m), Sound level calibrator
TM
Model 407790 Ver. 2.1 9/07 3
Meter Description
Refer to the diagram below for the following descriptions.
1. Windscreen
9. AC analog output jack
2. Microphone
3. Display
4. Operation keys
5. Power switch
6. Calibration adjust knob
7. 6VDC adapter jack
8. DC analog output jack
10. LCD contrast adjust knob
11. LCD backlight on/off switch
12. Hand strap
13. RS-232 interface connector
14. Battery compartment
15. Tripod mounting screw
FAST
L
A W
100
dB
80
60
40
20
2k
31.5Hz 500125
[ 1 / 3 OCT ] 01 / 06 / 19 14:26:39
65.2 dB
W8k L
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6
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SOUND ANALYZER
1/1 & 1/3 OCTAVE BAND
IEC 651 IEC 804 TYPE 2
IEC 1260 CLASS2
ACCURACY : ¡Ó1.5dB
IEC LR14 1.5V X 4
Model 407790 Ver. 2.1 9/07 4
Operation Buttons
Refer to the diagram on the next page for the following button descriptions.
MODE button
Press to display the following: Sound pressure level (L), equivalent continuous sound
pressure level (Leq), Sound exposure level (LE), maximum sound pressure level
(Lmax), and minimum sound pressure level (Lmin).
FREQ WGHT button
Selects the frequency weighting. “A” weighting (A), “C” weighting (C), and flat
frequency response (P).
TIME CONST button
Selects the response time “FAST” and “SLOW”.
LEVEL
Press to select the sound pressure level ranges in 1/1 and 1/3 octave band frequency
analysis mode. (20~90dB, 30~100dB, 40~110dB, 50~120dB and 60~130dB)
SLM/ 1/1/ 1/3 button
Press to select the operation mode: Sound level meter (SLM), 1/1-octave frequency
analysis (1/1), and 1/3-octave frequency analysis (1/3).
MEAS TIME button
Sets the Leq, LE, Lmax and Lmin measurement time :
24h1s3s10s30s1m5m8m10m15m
30m1h8h
2nd + MEAS TIME : Enter to setting the date and time mode.
MEMORY button
Enter to memory mode.
2nd + MEMORY : Enter to data record interval time setting : 0 (no record)
1s 3s10s 30s1m5m8m10m15m 30m1h62.5ms
ENTER button
Stores the new date and time (also starts the real-time calendar clock)
Cursor button
Press to move the octave frequency band marker during frequency analysis.
2nd+ Cursor : Use in recall mode to select the memory address in which to
store the measurement data.
START/STOP button
Press to start or stop the Leq, LE, Lmax and Lmin sound pressure level
measurement.
PAUSE/CONT button
Press to temporarily pause ( display) or resume (display )
2nd button: Press to change the buttons to their secondary functions.
Model 407790 Ver. 2.1 9/07 5
STORE button
In manual datalogging mode, press to store the measurement data.
RECALL button
In manual memory mode, press to recall the stored memory data.
STORE + RECALL key (Erase memory data)
Turn off the meter, press and hold the STORE and RECALL buttons and then turn
on the meter. Release buttons when the LCD displays “All memory erased”.
Model 407790 Ver. 2.1 9/07 6
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