407730 - Measurement Extech - Free user manual and instructions

Product Type	Digital Sound Level Meter
Model	407730
Brand	Extech
Measurement Range	40 to 130 dB (A weighting), 45 to 130 dB (C weighting)
Accuracy	±2 dB @ 1kHz (under reference conditions)
Resolution	0.1 dB
Frequency Weighting	Selectable 'A' and 'C'
Response Time	FAST (125 ms) and SLOW (1 second)
Display	LCD with bargraph
Microphone	0.5 inch (10 mm) Electret condenser
Measurement Bandwidth	300 Hz to 8 kHz
Calibration Source	1 kHz sine wave @ 94 or 114 dB
AC Output	0.707 Vrms full scale
Power Supply	4 AAA batteries (1.5V each)
Battery Life	Approximately 30 hours (typical)
Auto Power Off	After 20 minutes (can be disabled)
Operating Temperature	32 to 122°F (0 to 50°C)
Operating Humidity	10 to 90% RH
Storage Temperature	-4 to 140°F (-20 to 60°C)
Dimensions	9 x 2.3 x 1.7 inches (230 x 57 x 44 mm)
Weight	6 oz (172 g)
Warranty	2 years (limited on parts and workmanship)
Maintenance	Keep dry; avoid high temperature and humidity; remove battery for long-term storage
Safety	Dispose of batteries properly; do not incinerate; follow local regulations for disposal
Spare Parts / Reparability	Calibration and repair services available; contact Extech support

Frequently Asked Questions - 407730 Extech

How do I turn on the Extech 407730 sound level meter?

Press the ON-OFF button (labeled as Ⓐ) to power the meter. The LCD will turn on and begin displaying sound level readings.

How do I select A or C frequency weighting?

Press the A/C button to toggle between 'A' and 'C' weighting. The selected weighting icon will appear on the display. For most environmental measurements, use 'A' weighting.

What is the difference between FAST and SLOW response time?

FAST (125 ms) captures noise peaks and quick sounds, while SLOW (1 second) averages out fluctuations for steady sources. Use SLOW for most applications.

How do I change the measurement range manually?

Press the RNG button to switch from auto to manual ranging. The display shows 'MANU'. Each press steps through ranges: 40-70, 60-90, 80-110, and 100-130 dB. Press and hold RNG for 2 seconds to return to auto range.

What is MAX HOLD mode?

In MAX HOLD mode, the display only updates when a higher reading is detected. Press the MAX HOLD button to enter; press again to exit. The 'MAX HOLD' icon shows when active.

How do I record maximum and minimum values?

Press the REC button to start recording (REC icon appears). Press REC again to view the minimum (MIN icon), again for maximum (MAX icon), and again to return to real-time measurement. Press and hold REC to exit.

How can I disable the auto power off feature?

With the meter off, press and hold the power button (Ⓐ) and the MAX HOLD button simultaneously until a symbol appears, then release both. The meter will stay on until the power button is pressed again.

How do I calibrate the sound level meter?

Use an external calibrator (e.g., Extech 407744 or 407766) set to 1 kHz at 94 dB. Select the 80-110 dB range, 'A' weighting, and SLOW response. Place the microphone in the calibrator and adjust the calibration potentiometer with a small screwdriver until the display matches the calibrator output.

What type of battery does the Extech 407730 use?

It uses 4 AAA batteries (1.5V each). When the low battery icon appears, replace them. Dispose of used batteries according to local regulations.

What is the measurement range and accuracy of the meter?

The meter measures from 40 to 130 dB (A weighting) or 45 to 130 dB (C weighting). Accuracy is ±2 dB @ 1kHz under reference conditions with a resolution of 0.1 dB.

USER MANUAL 407730 Extech

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

12. 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.

13. Hold the meter away from the body.
14. 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.

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 ① 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.

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	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 @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	32 to 122°F (0 to 50°C)
Operating humidity	10 to 90% RH
Storage temperature	-4 to 140°F (-20 to 60°C)
Dimensions/weight	9 x 2.3 x 1.7"(230 x 57 x 44mm) / 6oz.(172g)

Two-year Warranty

Teledyne FLIR LLC warrants this Extech brand instrument to be free of defects in parts and workmanship for two years from date of shipment (a six-month limited warranty applies to sensors and cables). To view the full warranty text please visit: http://www.extech.com/support/warranties.

Calibration and Repair Services

Teledyne FLIR LLC offers calibration and repair services for the Extech brand products we sell. We offer NIST traceable calibration for most of our products. Contact us for information on calibration and repair availability, refer to the contact information below. Annual calibrations should be performed to verify meter performance and accuracy. Product specifications are subject to change without notice. Please visit our website for the most up-to-date product information: www.extech.com.

Contact Customer Support

Customer Support Telephone List: https://support.flir.com/contact

Calibration, Repair, and Returns: [e-mail]

Technical Support: https://support.flir.com

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