Extech Instruments LT510 User manual

USER MANUAL
Light Meter
Model LT510
Additional User Manual Translations available at www.extech.com

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Introduction
Thank you for selecting the Extech Model LT510. The LT510 measures light intensity in foot-candles
and Lux units. This device is shipped fully tested and calibrated and, with proper use, will provide
years of reliable service. Please visit our website (www.extech.com) to check for the latest version
and translations of this User Manual, Product Updates, Product Registration, and Customer
Support.
Features
•Light sensor with cosine correction filter
•Backlit LCD
•Light weight, compact, design
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 protective cover. Please dispose of batteries and meter responsibly and in
accordance with all applicable laws and regulations.

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Meter Description
1. Light Sensor
2. LCD Display
3. ON-OFF button
4. LCD Backlight button and ▲button
5. Units button
6. Hold button
7. Max/Min Record button
8. SET and ▼button
9. ZERO button
Note: Protective sensor cover not shown. Battery
compartment and Tripod mount
on rear

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Operation
1. Power the meter by pressing the power button. The meter will begin displaying light
intensity readings. If the LCD does not switch on, check the batteries located in the rear
battery compartment.
2. Remove the sensor cover.
3. Aim the light sensor at the light source for the most accurate readings.
4. View the measurement on the meter’s LCD
Unit Button
Press the UNIT button to select Lux or Ft-cd. The units will be indicated in the display.
Zero Function
To zero the display, place the light sensor cover over the sensor and press the ZERO button.
Data Hold
Short press the hold (H) button to freeze or unfreeze a reading on the display. The Hold function
is not operational in record mode.
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.
MAX-MIN Recording
In this mode, the meter records the maximum and minimum values over time.
Note: The Hold and 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 MIN value that occurred during the
recording period.
4. Press the Hbutton to clear the memory and start a new max/min measurement period.
5. Long press the Rbutton for to exit the record mode.

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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 appears in the display when APO is selected.
To turn APO ON or OFF as the default condition:
1. Long press the ▼/SET button. The lower display will show ‘PoFF’.
2. Short press the ▲or ▼button to enable APO (YES) or disable APO (NO) as shown in the
upper display.
3. Short press the Rbutton to save the selection.
4. The meter will return to normal operating mode after approximately 10 seconds or by
pressing the power button.
Maintenance
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 35 x 30mm (1.38 x 1.18”)
Light sensor Photo sensor with cosine correction filter
Measurement Units LUX and Ft-cd (Foot – Candle)
Input Overload Display “----“
Tripod mount On back of meter
Power 3 x 1.5V AAA batteries
Power Consumption Approx. 5mA DC
Automatic power off After approx. 10 minutes of inactivity
Operating temperature 0 to 50oC (32 to 122oF)
Operating humidity 80% RH max
Storage temperature -10 to 60oC (14 to 140oF)
Storage humidity 10 to 75% RH
Dimensions/weight 141 x 57 x 25mm (5.5 x 2.3 x 1.1”) /136g (4.8oz)
Electrical Specifications (23±5°C)
Lux (autorange)
Unit Range Resolution Accuracy
Lux 0 to 2,200 1
±5%rdg ±8dgt
1,800 to 20,000 10
Ft-cd (autorange)
Unit Range Resolution Accuracy
Ft-cd 0 to 204.0 0.1
±5%rdg ±8dgt
170 to 1,860 1
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