How it Works
Extech Instruments
Loading...
LT250W
User manual
14 pgs739.33 Kb0
Table of contents
Loading...

Extech Instruments LT250W User manual

Download
User Manual
LT250W Light Meter
Bluetooth®Connectivity with the ExView®Mobile App
www.GlobalTestSupply.com
Table of contents
1 Introduction..... ................. ..... ..... ..... ...................... ..... ..... ... 1
2 Safety ... ..... ..... ................. ..... ..... ..... ................. ..... ..... ..... ... 2
3 FCC Compliance ........... ..... ........................... ..... .................3
4 Product Description .... ..... ..... ................. ..... ..... ..... ..............4
4.1 Meter Description ...... ........................... ..... .................4
4.2 Function Buttons ................... ..... ........................... ..... 4
4.3 Display Symbols....... ..... ..... ..... ...................... ..... ..... ... 5
5 Operation ... ..... ................. ..... ..... ..... ................. ..... ..... ..... ... 6
5.1 Powering the Meter ..... ..... ................. ..... ..... ..... ..... ...... 6
5.2 Auto Power Off (APO).. ..... ................. ..... ..... ..... ..... ...... 6
5.3 Taking Measurements ......... ..... ..... ..... ................. ..... ... 6
5.4 Changing Measurement Units .............. ..... ..... ..... .......... 7
5.5 Data Hold Function ... ................. ..... ..... ..... ................. . 7
5.6 LCD Backlight ... ................. ..... ..... ..... ................. ..... ... 7
5.7 MAX/MIN Readings ..... ..... ................. ..... ..... ..... .......... 7
5.8 Bluetooth Operation ............ ..... ........................... ..... ... 7
6 Maintenance.. ..... ..... ..... ..... ............ ..... ..... ..... ..... ................. 9
6.1 General Cleaning .. ................. ..... ..... ..... ................. .... 9
6.2 Battery Replacement.... ..... ........................... ..... ..... ..... 9
7 Specifications.......................... ..... ........................... ..... .... 10
7.1 General Specifications................ ..... ..... ..... ................ 10
7.2 Measurement Specifications .. ................. ..... ..... ..... ..... 10
7.3 Environmental Specifications ....... ..... ..... ..... ................ 10
7.4 Connectivity Specifications .... ..... ..... ..... ............ ..... ..... 11
8 Two-year Warranty..... ..... ................. ..... ..... ..... ................. .. 12
8.1 Calibration and Repair Services.... ..... ..... ..... ................ 12
#NAS100076; r. AA/78957/78963; en-US ii
www.GlobalTestSupply.com
1

Introduction

Thank you for selecting the Extech LT250W Light Meter. This meter measures illuminance and displays it in Lux or foot candle units on the backlit LCD. Light is captured by the built-in domed photo-cell, situated at the top of the meter.
The meter includes Bluetooth connectivity, MAX/MIN memory, selectable unit of measure, 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.
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
1
2
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 separately.
• Do not store the device in high temperature or humidity environments, in flammable or combustible areas, or where a strong electromagnetic field is present.
• This device is CE certified.

Safety

Please read all safety information before using this device
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
2
3
WARNING
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

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:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
3
4
1. Light sensor
2. Backlit LCD (detailed below)
3. Function buttons (detailed below)
4. Tripod mount
5. Battery compartment

4.2 Function Buttons

Power / Bluetooth button
Long press to switch the device on. Short press to switch off.
With meter powered, 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. MAX/MIN 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 data hold is active.
Long press to switch the LCD backlight on/off.

Product Description

4.1 Meter Description

#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
4
4
Unit of Measure button
Short press to toggle Lux and foot candle (fc) units. Lux is the standard measurement unit, Foot candle readings are calculated.
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.
1. Bluetooth active
2. Illuminance measurement
3. Maximum and Minimum reading modes
4. Data Hold
5. Low battery symbol
6. Unit of measure symbols
7. x10 and x100 indicators (multiply reading)
Product Description

4.3 Display Symbols

#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
5
5
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 low battery symbol
appears on the display, replace the batteries
immediately to ensure accurate readings.

5.2 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
indicates that APO is
enabled).
To switch the APO function off, with the meter switched on, long press the power
and data hold (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.

5.3 Taking Measurements

1. Long press the power button
to switch the meter on.
2. Hold the meter in hand, set it face-up on a table or desk, or mount it on a
tripod in the area under test.
3. For best results, allow the light to fully encompass the sensor dome. Also,
reduce the ‘angle of incidence’ as much as possible (angle at which the light strikes the dome).
4. Read the illuminance reading on the LCD. If the x10 or x100 display ap-
pears, multiply the displayed reading by 10 or 100 to obtain the actual measurement.
5. If the measurement is out of range, OL will appear on the display in place
of a typical reading.

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
#NAS100076; r. AA/78957/78963; en-US
6
www.GlobalTestSupply.com
5
CAUTION
Do not touch or otherwise obstruct the sensor.
Do not allow liquids to come in contact with the sensor.
to switch the display backlight on or off.
Excessive use of the backlight will shorten battery life.

5.7 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. MAX will show when the Maximum reading is displayed and MIN will show when the Minimum reading is displayed. 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).

5.8 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 use are available from the ExView product page on the Extech website (link below).
Operation

5.4 Changing Measurement Units

Short press the LUX / FC button to toggle the displayed unit of measure (Lux or foot candles).

5.5 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.

5.6 LCD Backlight

Long press the backlight button
#NAS100076; r. AA/78957/78963; en-US
7
www.GlobalTestSupply.com
5
and H buttons for 2 seconds (the APO symbol will switch off). This will pre­vent the meter from automatically switching off while you are logging data or monitoring readings in real time on your smart device.
Operation
Switch APO off when using Bluetooth by pressing and holding the power
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
8
6
CAUTION
Warning: Do not open the housing or sensor module. Service should only be performed by factory personnel, there are no user-serviceable components in this device.
, replace the batteries immediately, as explained below.
1. Switch the meter off and remove the rear battery compartment cover.
2. Replace the batteries, observing correct polarity. Always use batteries of
the same type.
3. Secure the battery compartment before use.
Do not dispose of used batteries or rechargeable batteries in house-
hold waste.

Maintenance

6.1 General Cleaning

Wipe the housing and sensor with a damp cloth as necessary to clean. Do not use abrasives or solvents to clean this device.

6.2 Battery Replacement

This device is powered by three (3) 1.5 V (AAA) batteries. When the low bat­tery symbol appears
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
9
7
appears when batteries are low
Reading update rate Two readings per second
Sensor Silicon photo-cell
Meter power Three (3) 1.5 V (AAA) batteries
Dimensions 6.4 x 2.2 x 1.1 in. (163 x 55 x 28 mm)
Weight 4.2 oz. (118 g)

Specifications

7.1 General Specifications

Display 4 digit (9999) backlit multifunction LCD. Readings > 9999 are
accompanied by a x10 or x100 indicator
Over range indication OL is displayed when a measurement is out of range
Low battery indication Battery symbol

7.2 Measurement Specifications

Accuracy specifications apply for the following conditions:
Temperature: 73.4℉ ± 9℉ (23℃ ± 5℃); Relative Humidity: ≦ 80 %
Illuminance ranges Resolution Accuracy (% of reading)
0 to 9999 Lux
≧ 10,000 Lux
≧ 100,000 Lux
Notes:
The total range is 0 to 199,900 Lux
Foot candle (Fc) readings are converted from Lux measurements
Readings above 9999 are accompanied by a x10 or x100 indicator

7.3 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℃); < 75% RH
Drop-proof rating 3.3 ft. (1 m)
1 Lux
10 Lux
100 Lux
± (4% + 8 digits)
± (5% + 10 digits)
± (5% + 10 digits)
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
10
7
Specifications

7.4 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
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
11
8

Two-year Warranty

FLIR Systems, Inc. warrants this Extech brand instrument to be free of defects in parts and workmanship for two years from date of shipment (a six­month limited warranty applies to sensors and cables). To view the full war­ranty text please visit:

8.1 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:
#NAS100076; r. AA/78957/78963; en-US
www.GlobalTestSupply.com
12
Loading...
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use