Extech Instruments 407790 Manuel utilisateur

[ 1 / 3 OCT ] 01 / 07 / 27 14:26:39

100 WA

Hz 125

31.5 500

FAST 75.2 dB

8k2k LW

User Manual

Real Time Octave Band Analyzer

Model 407790

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

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407790 Product Page

Model 407790 Ver. 1.1 7/02L

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for one year from date of shipment (a six month limited warranty applies on sensors and

cables). If it should become necessary to return the instrument for service during or beyond the warranty

period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our

website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA

number). A Return Authorization (RA) number must be issuedbefore any product is returned to Extech. The

sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in

transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper

wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.

Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and

will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited

to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,

whether written or oral, is expressed or implied.

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), LE

(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

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

Model 407790 Ver. 1.1 7/02L

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 104oF (0 to 40℃); 10 to 90%RH

Storage Temperature/Humidity: 14 to 140oF (-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 WindowsTM

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

Model 407790 Ver. 1.1 7/02L

Meter Description

Refer to the diagram below for the following descriptions.

1. Windscreen

2. Microphone

3. Display

4. Operation keys

5. Power switch

6. Calibration adjust knob

7. 6VDC adapter jack

8. DC analog output jack

9. AC 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

[ 1 / 3 OCT ] 01 / 06 / 19 14:26:39

31.5Hz 500125

100 A W

W8k L

65.2 dB

IEC 1260 CLASS2

OFFON

POWERCAL

IEC LR14 1.5V X 4

ACCURACY : ¡ Ó1.5dB

OFFON

DCAC

CONTRAST

OUTPUT

DC6VLIGHT

SOUND ANALYZER

IEC 651 IEC 804 TYPE 2

1/1 & 1/3 OCTAVE BAND

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

FAX 781.665.0780 - TestEquipmentDepot.com

Model 407790 Ver. 1.1 7/02L

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.

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”.

Model 407790 Ver. 1.1 7/02L

Measurement Screens

1. Sound pressure level measurement screen

[ SLM ] 01 / 07 / 27 14:26:39

30 80

FAST dB

130

2. 1/1-octave analysis screen

The staircase shape on the display represents the 1/1-octave analysis result. From left,

the bars correspond to 31.5, 63, 125, 250, 500, 1k, 2k, 4k, 8kHz. To read the levels at

these frequencies, use the Cursorkey to move the cursor to the desired point.

The frequency and level are then shown on the upper of the screen.

68.4 dB

[ 1 / 1 OCT ] 01 / 07 / 27 14:26:39

31.5 125Hz

30 8k2k500

100

FAST 2k Hz

L W

3. 1/3-octave analysis screen

The staircase shape on the display represents the 1/3-octave analysis result. From left,

the bars correspond to 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500,

630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10kHz. To read the levels at

these frequencies, use the Cursorkey to move the cursor to the desired point.

The frequency and level are then shown on the upper of the screen.

[ 1 / 3 OCT ] 01 / 07/ 27 14:26:39

31.5Hz30

2k500125 8k L W

FAST

dB LW 75.2 dB

100

Calibration

Use a standard acoustic calibrator such as the Extech 407744 or

407766. Acoustic calibration if often performed on a daily basis to

compensate for any possible changes in microphone sensitivity.

1. Configure the following switch settings.

Display: SLM (LA)

Time weighting: FAST

2. Insert the microphone carefully into the insertion hole of the

calibrator.

3. Turn on the calibrator and adjust its CAL potentiometer so

that the display matches the calibrator output.

4. Note that the 407790 is fully calibrated before shipment.

5. Recommended full recalibration cycle: 1 year.

Measurement Preparation

1. Battery loading: Remove the rear battery cover and insert four 1.5V ‘C’ size batteries.

Take care to observe battery polarity.

2. Battery replacement: When the battery voltage drops below operating voltage,

3. LBATT flashes on the display.

4. AC adaptor connection: Insert the adaptor in the DC 6V jack on the side panel.

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

FAX 781.665.0780 - TestEquipmentDepot.com

Model 407790 Ver. 1.1 7/02L

Setting the Calendar Clock

Date and time information is stored with each record saved. Set the date and time as follows:

1. Press the 2nd button once and then press the MEAS TIME button to enter the date and

time mode. The display screen in the second function location will flicker.

2. Press the LEVELbutton to increment/decrement the values.

3. Use the Cursorbutton to scroll through year/month/day/hour/minute/second

setting locations (location will flash when it is ready to be programmed).

4. Press the LEVELbutton to set the value.

5. When the settings are correct, press the ENTER button to exit this mode. The calendar

clock will start running.

Note: When no changes are made to the date and time or the ENTER button is not

pressed within one minute, the date and time settings will not change and the unit

returns to normal operating mode automatically.

Sound Pressure Level

Technical notes

1. The decibel (dB)

The range over which the human ear responds to sound pressure (noise) is extremely

large; in Pascals (Pa) it is 20µPa (the threshold of hearing) to 100 Pa (the threshold of

pain). The measurement of sound pressure has been made more convenient by the

use of the decibel, which is logarithmic. However, decibels are non-linear and

therefore cannot be added together. A simple rule is that doubling the amplitude of the

noise under test causes the level to rise by 3dB.

2. SLM-sound level meter: Instantaneous sound pressure level (SPL) is used for spot

checks to establish instantaneous noise levels. SPL is defined by the logarithmic

equation:

SPL (in dB): 20 log10

Where P = rms measured sound pressure level

P0= rms reference sound pressure level (20µPa)

3. Leq-level equivalent (continuous): Leq is used to assess the rms average noise level

over a preset period of time, often the starting point of a noise assessment. To take a

Leq measurement the period of time over which it is to be made must be selected.

The longer the period of measurement time, the more accurate the Leq reading will be,

a typical period is 8 hours (the length of a working day).

4. LE– Sound exposure level

LEmeasurements are almost identical to Leq measurements but normalised or

compressed to 1 second. This allows the total sound energy of an event, such as train

passing a platform, to be evaluated. Another event, such as the next train, which lasts

for a different amount of time, can be measured in the same way. The two readings

can be compared to assess how much total noise the passengers standing at the

platform were exposed to by each train. To make an LEmeasurement either a preset

time period must be selected on the instrument, or the PAUST/CONT key must be

used to stop and start the measurement of a specific event.

Model 407790 Ver. 1.1 7/02L

Instantaneous sound pressure level measurement (LA, LC, LP)

To perform a measurement, carry out the following steps.

1. Set the power switch to ON and wait until the measurement screen appears.

ID No: 00001358 Ver: 0.10

SOUND LEVEL METER

1/1 & 1/3 Octave Band

Real-Time Analyzer

Self-Testing... [ SLM ] 01 / 07 / 27 14:26:39

30 80

FAST dB

130

2. Press the SLM/ 1/1/ 1/3 button to select the desired SLM, 1/1 or 1/3 octave band

sound pressure level measurement screen.

500

[ 1 / 1 OCT ] 01 / 07 / 27 14:26:39

125Hz 31.5

8k L W2k

FAST L

dB 75.2 dBW

100

[ 1 / 3 OCT ] 01 / 07/ 27 14:26:39

31.5Hz30

2k500125 8k L W

FAST

dB LW 75.2 dB

100

3. Use the FREQ WGHT button to select the desired LA, LCor LPfrequency weighting

setting.

4. Use the TIME CONST button to select the desired FAST or SLOW time constant

setting. Normally, the “FAST” setting should be used.

5. Use the

LEVELbutton to select the range. Choose a setting in which the “OVER”

and “UNDER” indications do not appear. In SLM mode, the dynamic range is

30~130dB so the LEVELbutton is not used.

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