Extech Instruments SL510 User manual

USER MANUAL

Digital Sound Level Meter

Model SL510

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Introduction

Thank you for selecting the Extech Model SL510. The SL510 measures sound levels in decibels. This

device is shipped fully tested and calibrated and, with proper use, will provide years of reliable

service. Please visit our website ( ) to check for the latest version and translations

of this User Manual, Product Updates, Product Registration, and Customer Support.

Features

• Standard 0.5” microphone head

• A/C frequency weighting

• LCD with backlight

• Light weight, compact design

• Wristlet for convenient, one-handed operation

Safety

Please read the entire Quick Start and User Manual before operating this device. Use the meter

only as specified and do not attempt to service or open the meter housing. Do not allow children to

handle the meter or the windscreen. Please dispose of batteries and meter responsibly and in

accordance with all applicable laws and regulations.

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Meter Description

1. Microphone with windscreen

2. LCD Display

3. ON-OFF button

4. LCD Backlight button and ▲button

5. A/C weighting selection button

6. Hold button

7. Max/Min Record button

8. SET, Peak capture and ▼button

9. Fast/Slow response selection button

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.

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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 batteries located in the rear battery

compartment.

2. Hold the meter in hand facing the microphone toward the source of the sound to be

measured.

3. View the measurement on the meter’s LCD

‘A’ and ‘C’ Frequency Weighting

Press the A/C button to select A or C frequency weighting. The A or C icon will appear in the

display to indicate the weighting selected.

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.

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

‘FAST’ and ‘SLOW’ Time Weighting

Use the button to select FAST (125 ms) or SLOW (1 second) time weighting. The For Sicon

will appear in the display as selected.

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.

Select FAST response for most applications.

Data Hold

To freeze a displayed reading, press the Hbutton. The Hicon will appear and the most recent

reading will appear in the display. Press the Hbutton to exit the mode and return to normal

operation

Backlight

The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. Press the

backlight button to turn the backlight on. The backlight will automatically turn off after 10

seconds.

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Peak Hold

The Peak mode is used to capture and hold the peak sound level measurement.

1. Press the ▼SET/PEAK button to enable the peak capture mode. The peak icon will

appear on the display.

2. The meter will now display the highest peak reading during the measurement period.

3. Press the ▼SET/PEAK button to exit the peak capture mode

MAX-MIN Recording

In this mode, the meter records the maximum and minimum values over time.

Note: A/C, Fast/Slow, Hold and the Power buttons are not operational in the Record mode.

1. Short press the Rbutton to enter the Record mode. The record icon will appear on the

display. The maximum and minimum values will be recorded and updated during the

measurement period.

2. Short press the Rbutton to stop the Max-Min recording. The icon and the MAX value

that occurred during the recording period will be displayed.

3. Short press the Rbutton to display the icon and the MIN value that occurred during the

recording measurement period.

4. Short press the Hbutton to clear the memory and start a new max/min measurement

period.

5. Long press the Rbutton to exit the record mode.

Auto Power OFF (APO)

In order to conserve battery life, the meter will automatically shut off after approximately 10

minutes of inactivity. The APO icon is active in the display when APO is selected.

To turn APO ON or OFF as the default condition:

1. Press and Hold the ▼ button for 2 seconds. The yes or no icon will appear:

2. Press the ▲button to turn the APO ON (YES) or press the ▼button to turn the APO OFF

(NO).

3. Press the Rbutton to save the selection.

4. Short press the power button or wait approximately 10 seconds for the meter to return to

normal operation.

Note: APO is not operational in the Record mode.

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Calibration

To calibrate the SL510, an external calibrator that can provide a 94.0dB signal at 1 kHz is required.

1. Turn the meter ON

2. Put the meter in the ‘A’ weighting mode.

3. Put the meter in the ‘FAST response mode.

4. Place the microphone into the calibrator. Set the calibrator to

output a 1kHz sine wave @ 94dB.

5. When the reading is stable, simultaneously press and hold the A/C

and Fast/Slow buttons until a second lower dB display appears.

6. Press the ▼or ▲buttons to adjust the upper display to match the

calibrator output (94.0dB).

7. Press the Rbutton to save the calibration and return to normal operation.

Maintenance

WARNING: To avoid electrical shock, disconnect the meter from any circuit and turn OFF

the meter before opening the case. Do not operate with an open case.

Battery Replacement

1. Power OFF the meter.

2. Remove the flat head screw that secures the battery compartment at the back of the

meter.

3. Open the battery compartment and replace the 3 AAA batteries observing correct polarity.

Re-assemble the meter before use

Safety: Please dispose of batteries responsibly; never dispose of batteries in a fire, batteries may

explode or leak. If the meter is not to be used for 60 days or more, remove the battery and store

separately.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are

sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or

solvents.

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Specifications

Display Backlit LCD

Microphone 0.5” Electret condenser

Input Overload Display “----“

Measurement Range 35 to 130dB

Resolution 0.1dB

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

Accuracy / Resolution ± 1.0 dB @ 1kHz / 0.1dB

Frequency 31.5 to 8000 Hz

Response time Fast: 125 milliseconds / Slow: 1 second

Calibration source

required

1KHz sine wave @ 94dB

Tripod mount On back of meter

Power 3 x 1.5V AAA batteries

Power Consumption Approx. 7.2mA DC

Automatic power off After approx. 10 minutes of inactivity

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

Operating humidity 10 to 80% RH

Storage temperature -10 to 60oC (14 to 140oF)

Storage humidity 10 to 75% RH

Dimensions/weight 167 x 57 x 25mm (6.6 x 2.3 x 1.1”) /146g (5.1oz)

±1dB high accuracy meets Class 2 standards (IEC 61672-2013 and ANSI/ASA

S1.4/Part 1

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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

ISO-9001 Certified

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