Extech Instruments 407730 Manuale utente

User's Guide

Digital Sound Level Meter

Model 407730

Model 407730 Version 1.3 June 2004

REC MAX HOLD MIN

AUTO

MANU

SPL

FAST

SLOW

+10

+0 +20 +30

78910

Introduction

Congratulations on your purchase of the Extech 407730 Digital Sound Level Meter. The

407730 measures and displays sound pressure levels in dB from 40 to 130dB. User

selectable features include Frequency Weighting (‘A’ and ‘C’), Response Time (Fast and

Slow), Max Hold, and Max/Min recording. Careful use of this meter will provide years of

reliable service.

Meter Description

1. Microphone

2. LCD Display

3. ON-OFF button

4. A/C weighting selection button

5. Min/Max Record button

6. Range selector button

7. F/S response selection button

8. Max Hold selector button

9. Calibration adjustment

10. AC analog output jack

11. Windscreen

1. Record icon

2. Auto or Manual range

3. Range indicator

4. Bargraph

5. A or C weighting

6. Low bat icon

7. Max level indicator

8. Hold indicator

9. Min indicator

10. Fast or Slow weighting

11. dB display

Model 407730 Version 1.3 June 2004

Operation

1. Power the meter by pressing the power button. The meter will begin displaying

sound level readings. If the LCD does not switch on, check the 9V battery located in the

rear battery compartment.

2. Hold the meter away from the body.

3. View the measurement on the meter’s display. If the meter is in the autoranging mode,

the display may briefly indicate “HI” or “LO” if the noise level is above or below the

currently selected range. The meter will change the range as needed to display the dB

level.

‘A’ and ‘C’ Frequency Weighting

Use the ‘A/C’ button to select ‘A’ or ‘C’ frequency weighting.

With ‘A’ weighting selected, the frequency response of the meter is similar to the response

of the human ear. ‘A’ weighting is commonly used for environmental or hearing

conservation programs such as OSHA regulatory testing and noise ordinance law

enforcement. ‘C’ weighting is a much flatter response and is suitable for the sound level

analysis of machines, engines, etc. “A” or “C” icons will appear in the display.

Most noise measurements are performed using 'A' Weighting and SLOW Response.

‘FAST’ and ‘SLOW’ Response Time

Use the ‘F/S’ button to select FAST (125 ms) or SLOW (1 second) response time. Select

FAST to capture noise peaks and noises that occur very quickly. Select the SLOW

response to monitor a sound source that has a consistent noise level or to average quickly

changing levels. “FAST” or “SLOW” icons will appear in the display.

Select Slow response for most applications.

Auto or Manual Ranging

The meter will turn on in the auto-ranging mode and “AUTO” will be indicated on the

display. In this mode the meter will automatically select the best range for the noise level

being measured. If the measured dB level exceeds the range of the meter or the range of

a selected range, “HI” will appear in the display. If the measured dB level is lower than the

selected range, “LO” will appear in the display.

1. Press the RNG button to manually select the range, “MANU” will be indicated on the

display. The four ranges are: 40-70, 60-90, 80-110 and 100-130. Press the RNG button

to step through the ranges.

2. Press and Hold the RNG button for 2 seconds to exit the manual range mode.

MAX HOLD

In this mode the meter only updates the LCD when a higher reading than the one presently

on the display is detected.

1. Press the MAX HOLD button to enter the Max Hold mode.. The “MAX HOLD” icon will

appear in the display.

2. Press the MAX HOLD button again to exit this mode.

Model 407730 Version 1.3 June 2004

MAX/MIN Recording

In this mode the meter records the Maximum and Minimum readings and stores them into

memory.

1. Press the REC button to enter the RECORD mode. The “REC” icon will appear in the

display.

2. Press the REC button again to display the minimum value recorded since the mode was

entered. The “MIN” icon will appear in the display. The meter is not recording during this

time.

3. Press the REC button again to display the maximum value recorded since the mode

was entered. The “MAX” icon will appear in the display. The meter is not recording

during this time.

4. Press the REC button again to display the present dB level and continue recording.

5. Press and hold the REC button until the “REC” icon clears to exit the mode.

Auto-Power Off

The meter will automatically shut off after 20 minutes of operation. To disable this feature:

1. With the meter OFF, Press the and MAX HOLD buttons simultaneously.

2. will appear in the display

3. Release the button and then release the MAX HOLD button.

4. The meter will remain on until the power button is pressed.

Calibration

To calibrate the meter, an external calibrator such as the Extech 407744 or the Extech

407766 is required in addition to a small screw-driver.

1. Turn the meter ON

2. Select the 80 to 110dB range

3. Select ‘A’ weighting and ‘SLOW’ response

4. Place the microphone into the calibrator. Set the calibrator to output a 1kHz sine wave

@ 94dB

5. Adjust the calibration potentiometer for a display as close as possible to the calibrator’s

output

Battery Replacement

When the low battery icon appear replace the battery by removing the screw securing

the rear battery compartment and replacing the 4 AAA batteries.

Tripod Mount

A camera tripod mount is located on the rear of the meter for increased stability and

elimination of body reflections.

Measurement Considerations

1. Wind blowing across the microphone increases the noise measurement. Use the

supplied windscreen to cover the microphone when applicable.

2. Calibrate the instrument before each use if possible. Especially if the meter has not

been used for a long period of time.

3. Do not store or operate the instrument in areas of high temperature or humidity.

4. Keep meter and microphone dry.

5. Avoid severe vibration.

6. Remove the battery when the meter is to be stored for long periods of time.

Model 407730 Version 1.3 June 2004

Specifications

Display LCD with bargraph

Microphone 0.5” (10mm) Electret condensor

Measurement Bandwidth 300Hz to 8KHz

Measurement Range 40 to 130dB (A wtg), 45 to 130dB (C wtg)

Frequency weighting ‘A’ and ‘C’ (selectable)

Accuracy / Resolution ± 2dB (under reference conditions) / 0.1dB

Response time Fast: 125 milliseconds / Slow: 1 second

Calibration source 1KHz sine wave @ 94 or 114dB

AC output 0.707Vrms full scale

Power 4 AAA Batteries

Battery life 30 hours (typical); low battery indicator alerts user

Automatic power off After approx. 20 minutes

Operating temperature 32 to 122oF (0 to 50oC)

Operating humidity 10 to 90% RH

Storage temperature -4 to 140oF (-20 to 60oC)

Dimensions/weight 9 x 2.3 x 1.7” (230 x 57 x 44mm) / 6oz (172g)

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 to 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 www.extech.com for contact

information. A Return Authorization (RA) number must be issued before 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.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

Model 407730 Version 1.3 June 2004



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]m

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Typical A-Weighted Sound Levels

50HP Siren (100')

130

120

110

100

140

Jet takeoff (200')

dBA

Riveting machine

Chain saw

Subway (20') Boiler room

Pneumatic drill (50') Freight train (100')

Vacuum cleaner (10') Speech (1')

Large store Large Office

Small office Residence

Night residential area

Whisper (5'0) Sound studio

Threshold of hearing

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