Extech Instruments 407790 User Manual

User Manual

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Real Time Octave Band Analyzer

Model 407790

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

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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:

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

±1.5dB (ref 94dB @1kHz)

to

10 kHz

70dB (20 to 90dB, 30 to 100dB, 40 to 110dB, 50
to 120dB, 60 to 130dB

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Model 407790 Ver. 1.1 7/02L

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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)

Storage type

Mode

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 3070 data sets

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. 2hours

Operating Temperature/Humidity: 32 to 104

Storage Temperature/Humidity: 14 to 140

o

F (0 to 40℃); 10 to 90%RH

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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, 9 pin to 25 pin adapter, adjustment screw driver, Windscreen,

3.5mm plug, and AC adaptor

Optional accessories: Microphone extension cable (5m or 10m), Sound level calibrator

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Model 407790 Ver. 1.1 7/02L

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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

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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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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. 1.1 7/02L

FAX [phone] - TestEquipmentDepot.com

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 :

24h1s3s10s30s1m5m8m10m15m
30m1h8h



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 3s10s 30s1m5m8m10m15m 30m1h62.5ms

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.

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Model 407790 Ver. 1.1 7/02L

STORE button

In manual dataloggin 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”.

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Model 407790 Ver. 1.1 7/02L