Extech Instruments 407730 Manuale utente

User's Guide

Digital Sound Level Meter

Model 407730

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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

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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. 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.

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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.

You, as the end user, are legally bound (Battery ordinance) to return all used batteries

and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators at collection points in your

community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

Tripod Mount

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

body reflections.

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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.

Specifications

Display LCD with bargraph

Microphone 10mm (0.5 ) 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 @1kHz (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 0 to 50oC (32 to 122oF)

Operating humidity 10 to 90% RH

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

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

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