407730 Guide Datasheet by FLIR Extech

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User's Guide
Digital Sound Level Meter
Model 407730
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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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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
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
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
2. Press and Hold the RNG button for 2 seconds to exit the manual range mode.
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.
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.
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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