EXTECH SL250W Sound Meter User Manual
- June 6, 2024
- EXTECH
Table of Contents
SL250W Sound Meter
User Manual
Introduction
Thank you for selecting the Extech SL250W Sound Meter. This meter measures
sound level with its built-in microphone, situated at the top of the meter.
Sound level measurements are shown on the backlit LCD in decibel (dBa) units.
The meter includes Bluetooth connectivity, MAX/MIN memory, selectable
Fast/Slow response, auto power-off, data hold, backlit LCD, and tripod mount.
Using the Extech ExView mobile app, you can pair your smart devices with the
meter using Bluetooth. The app and the W Series meters were developed together
for seamless integration. Download the free app from the App Store (iOS®) or
from Google Play (Android™).
This quality instrument is designed to provide years of reliable service, high
accuracy, and simple operation. Please visit the Extech website for additional
information and world-class support.
Safety
Please read all safety information before using this device
CAUTION
- Check for damage to the device’s housing, sensor, display, and battery compartment before use. If obvious damage or abnormalities are noticed, please discontinue use and return the device for service.
- Do not attempt to open the meter housing or access the sensor module. There are no user-serviceable components in this device.
- Replace the batteries immediately after the low battery symbol appears. If the device is to be stored for a period of months, please remove the batteries and store them separately.
- Do not store the device in high temperature or humidity environments, inflammable or combustible areas, or where a strong electromagnetic field is present.
- This device is designed and produced following the strict requirements of SJ/T 10423 General Specification for Sound Level Meters.
- This device is CE-certified.
FCC Compliance
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
WARNING
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
Product Description
Meter Description
| 1. Microphone with windscreen attached | 4. Tripod mount |
|---|---|
| 2. Backlit LCD (detailed below) | 5. Battery compartment |
| 3. Function buttons (detailed below) |
Function Buttons
| Power / Bluetooth button
Long press to switch the device on. Short press to switch off.
With the meter powered, a long press to switch Bluetooth on/off.
Short press to switch the meter off directly from the Bluetooth mode.
---|---
| MAX/MIN button
Short press to cycle through MAX/MIN readings. The memories are cleared each
time meter power is cycled.
| Data Hold / Backlight button
Short press to freeze/unfreeze the displayed reading. HOLD will display when
the data hold is active.
Long press to switch the LCD backlight on/off.
| FAST / SLOW button
Short press to toggle the Fast and Slow modes. In Fast mode (125 ms) sounds
that peak very quickly, such as a firework ignition or a rifle discharge, can
be captured. Slow mode (1 second) is intended for sounds that are continuous,
such as the drone of machinery.
APO ON/OFF| With the meter on, long-press the power and H buttons to
switch APO on/off. The APO symbol
is displayed when APO is enabled. APO is reset each time the meter power is
cycled.
Display Symbols
| 1. Bluetooth active | 6. Battery status icon |
|---|---|
| 2. A-weighted (dBa) sound level reading | 7. Slow response mode |
| 3. Maximum reading | 8. Fast response mode |
| 4. Minimum reading | 9. Auto Power Off (APO) symbol |
| 5. Data Hold mode |
Operation
5.1 Powering the Meter
The meter operates on three (3) 1.5 V (AAA) batteries, installed in the rear
compartment.
Long press the power button to switch the meter on. Short press the power
button to switch the meter off. If the meter does not switch on, check the
batteries for proper orientation.
When the battery icon appears on the display, replace the batteries
immediately to ensure accurate readings.
Auto Power Off (APO)
The meter switches OFF automatically five (5) minutes after the last button
press.
The default mode for APO is ON (the APO symbol on the display indicates that
APO is enabled).
To switch the APO function off, with the meter switched on, long-press the
power and H buttons. The APO symbol will switch off, indicating that the
function is disabled. APO is reset each time the meter’s power is cycled.
Repeat this process to switch APO back on manually.
Taking Measurements
- Long press the power button to switch the meter on.
- Hold the meter in hand, set it on a desk or table, or mount it on a tripod in the area under test.
- Read the sound level measurement on the LCD. Sound level measurements are presented in A-weighted decibel units. A-weighted measure- ments simulate the response curve of the human ear to sound.
- If the measurement is over range, OL will appear on the display in place of a typical reading. If the measurement is under range, UN will appear.
CAUTION
Do not touch or otherwise obstruct the microphone.
Do not allow liquids to come in contact with the microphone.
Do not allow dust or other particles to enter the microphone.
Use the windscreen to cover the microphone in windy environments.
Fast/Slow Response
Short press the Fast/Slow button to toggle the meter’s response time. Use the
Fast response mode (125 ms) to capture sounds that peak very quickly such as
fireworks. Use the Slow response mode (1 second) to monitor consistent sounds
such as the hum, or drone, of machinery.
Data Hold Function
Short press the Data Hold (H) button to freeze/unfreeze the displayed
readings.
While Data Hold is active, HOLD will appear on the LCD.
LCD Backlight
Long press the backlight button to switch the display backlight on or off.
Excessive use of the backlight will shorten battery life.
MAX/MIN Readings
When the device is switched on, it begins tracking the highest (MAX) and
lowest (MIN) readings.
Short press the MAX/MIN button to step through the MAX/MIN memories.
The memories are cleared each time the meter power is cycled.
Press the MAX/MIN button again to exit this mode (MAX and MIN symbols switch
off when you exit).
Bluetooth Operation
Long press the Bluetooth button with the meter on, to switch Bluetooth on or
off. This communication symbol is shown when Bluetooth is on.
The Bluetooth utility allows you to remotely monitor readings on an iOS or
Android smart device using the Extech ExView mobile app designed for use with
this meter.
Download the ExView mobile app from the App Store for iOS devices or from
Google Play for Android devices. Instructions for mobile app users are
available from the ExView product page on the Extech website (link below).
http://www.extech.com
Switch APO off when using Bluetooth by pressing and holding the power and H
buttons for 2 seconds (the APO symbol will switch off). This will pre-vent the
meter from automatically switching off while you are logging data or
monitoring readings in real-time on your smart device.
Maintenance
CAUTION
Warning: Do not open the housing or microphone module. Service should only be
performed by factory personnel, there are no user-serviceable components in
this device.
General Cleaning
Wipe the housing with a damp cloth as necessary to clean. Do not use abrasives
or solvents to clean this device. Do not allow moisture to enter the
microphone
or the meter housing.
Battery Replacement
This device is powered by three (3) 1.5 V (AAA) batteries. When the low
battery symbol appears, replace the batteries immediately, as explained below.
- Switch the meter off and remove the rear battery compartment cover.
- Replace the batteries, observing correct polarity. Always use batteries of the same type.
- Secure the battery compartment before use.
Do not dispose of used batteries or rechargeable batteries in the household waste.
Specifications
General Specifications
| Display | 4 digit (9999) backlit multifunction LCD |
|---|---|
| Over range indication | OL is displayed when measurements are above the |
specified measurement range. UN is displayed when sounds are below the
specified range.
Low battery indication| Battery symbol appears when batteries are low
Reading update rate| Fast mode: One reading every 125 ms Slow mode: One
reading per second
Microphone type| Condenser 1.3 cm (0.5 in.)
Meter power| Three (3) 1.5 V (AAA) batteries
Dimensions| 6.1 x 2.2 x 1.1 in. (154 x 55 x 28 mm)
Weight| 4.1 oz. (116 g)
Measurement Specifications
Accuracy specifications apply for the following conditions:
Temperature: 73.4℉ ± 9℉ (23℃ ± 5℃); Relative Humidity: < 90 %
Temperature coefficient: 0.1 x accuracy /℃
| Measurement range | 30 to 130 dB (A-weighted) |
|---|---|
| Display resolution | 0.1 dB |
| Measurement accuracy | ± 1.5 dB |
| Frequency Response | 31.5 Hz to 8 kHz |
Environmental Specifications
For indoor use only
| Altitude | 6562 ft. (2000 m) maximum |
|---|---|
| Pollution degree | 2 |
| Operating conditions | 32 to 104℉ (0 to 40℃); < 80% RH |
| Storage conditions | –4 to 140℉ (-20 to 60℃); < 80% RH |
| Drop-proof rating | 3.3 ft. (1 m) |
Specifications
Connectivity Specifications
| Connectivity | Bluetooth (with ExView app) |
|---|---|
| ExView app compatibility | iOS 13.0 and Android 9.0 or higher |
| Transmission distance | Up to 295.3 ft. (90 m) with no line-of-sight |
obstruction
Two-year Warranty
FLIR Systems, Inc. warrants this Extech brand instrument to be free of defects
in parts and workmanship for two years from the date of shipment (a six month
the 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
FLIR Systems, Inc. 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:
repair@extech.com
Technical Support: https://support.flir.com
Website
http://www.flir.com
Customer support
http://support.flir.com
Copyright
© 2021, FLIR Systems, Inc. All rights reserved worldwide.
Disclaimer
Specifications are subject to change without further notice. Models and
accessories are subject to regional market considerations. License procedures
may apply. Products described herein may be subject to US Export Regulations.
Please refer to exportquestions@flir.com
with any questions.
Publ. No.: NAS100077
Release: AA
Commit: 78958
Head: 78963
Language: en-US
Modified: 2021-08-26
Formatted: 2021-08-26
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