Extech Instruments LT300 User manual

USER GUIDE

Digital Light Meter

Model LT300

www. .com information@itm.com1.800.561.8187

LT300-EU-EN V2.3 2/13

Introduction

Congratulations on your purchase of the Extech LT300 Digital Light Meter. The LT300 measures

light level (illuminance) to 400,000 Lux (40,000 Fc). The LT300 offers a backlit display, MAX/MIN,

Data Hold, Relative, Peak, and Reset features. This instrument 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 of this User Guide, Product Updates, and

Customer Support.

Meter Description

1. Sensor cable

2. Analog bargraph

3. Numerical display

4. RANGE button

5. ON/OFF button

6. MAX/MIN button

7. RESET button

8. LCD Backlight button

9. LUX button

10. Fc foot candle button

11. Protective rubber jacket

12. RELATIVE button

13. Data HOLD button

14. PEAK button

15. Photo sensor dome

Notes: Protective sensor cap not shown. Battery compartment, Tilt Stand, and Tripod Mount

are located on the rear of the instrument. The protective rubber jacket must be removed

from meter to access battery compartment.

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LT300-EU-EN V2.3 2/13

Operation

Light sensor

1. The light sensor is permanently attached to

the meter by the coiled cable.

2. Remove the protective cap by unsnapping it

to expose the white domed light sensor.

When the 

sensor s protective cap is removed, the white domed light sensor lens will begin to

capture light. Replace the cap when the meter is not in use.

Turn Power ON or OFF

Press the button to turn power on or off. If the display does not switch on, check that the 9V

battery is installed and is fresh.

Selecting Lux or Foot candle units of measure

Press the LUX button to select lux units or the Fc button to select foot candle units.

Measurement Procedure

1. Remove the protective cap from the sensor so that the white domed light sensor is exposed

to the light. For overhead lighting, the sensor can be placed on a desk or table top. A tripod

mount and a tilt stand are located on the rear of the meter for convenience.

2. The display will indicate the light level in Fc or Lux.

3. Press the RANGE button to select the range that provides the maximum resolution. If the

 

OL appears the light measurement is out of range. Select another range using the RANGE

button.

4. Press the backlight button to illuminate the LCD display if needed.

MAX/MIN

The Max/Min function allows for recording and display of the maximum and minimum light

levels over time.

1. Press the MAX/MIN button. The MAX display icon will appear and meter will now display

and hold only the highest reading. The display will update only when a higher reading is

measured.

2. Press MAX/MIN button. The MIN display icon will appear and meter will now display and

hold only the lowest reading. The display will update only when a lower reading is measured

3. Press MAX/MIN again. The MAX MIN display icons will appear flashing and meter will now

display the current reading, but will continue to record the highest and lowest values.

4. Press MAX/MIN again to cycle through MAX and MIN displays.

5. To exit the MAX MIN mode, press and hold the MAX/MIN button until the MAX and MIN

icons completely disappear.

Data Hold

Press the HOLD button to freeze the displayed reading. The MANU 

HOLD hold icon will appear

on the display. Press the HOLD button again to return to normal operation. When the Data Hold

function is enabled the analog bar graph will continue to display level changes.

www. .com information@itm.com1.800.561.8187

LT300-EU-EN V2.3 2/13

www. .com information@itm.com1.800.561.8187

LT300-EU-EN V2.3 2/13

Maintenance

Cleaning and storage

1. The white plastic sensor dome should be cleaned with a damp cloth when necessary. Use

only a mild soap if needed. Do not use solvents, abrasives, or harsh detergents to clean the

dome.

2. Store the meter in an area with moderate temperature and humidity (refer to the operating

and storage range in the  

Specifications section).

Battery Replacement

When the battery power begins to fail the low battery symbol  will appear on the LCD. Replace

the 9V battery by first removing protective jacket that encases the meter. Remove the rear

(center) battery compartment screw to access the battery compartment. Ensure that the

compartment cover is securely fastened and that the protective jacket is properly installed

before using the meter.

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.

Other Battery Safety Reminders

Never dispose of batteries in a fire. Batteries may explode or leak.

Never mix battery types. Always install new batteries of the same type.

www. .com information@itm.com1.800.561.8187

LT300-EU-EN V2.3 2/13

Specifications

Ranges and Resolution Accuracy

Lux

40.00, 400.0, 4000, 40.00k, 400.0kLux ± (5% Rdg + 0.5% Full Scale)

Foot candle (Fc)

40.00, 400.0, 4000, 40.00kFc ± (5% Rdg + 0.5% Full Scale)

General Specifications

Display Multi function 3 3/4 (3999) digit LCD with Bargraph indicator

Over range indication LCD displays  

Spectral response CIE photopic (CIE human eye response curve)

Spectral accuracy CIE V function (f16%)

Measurement Repeatability ±2%

Temperature coefficient ±0.1% per oC

Sampling rate 13.3 times per second (bargraph); 1.3 times per second (digital

display)

Photo detector Silicon photo diode with spectral response filter

Peak Hold Capture light peaks to 10µS

Operating conditions Temperature: 0 to 40oC (32 to 104oF); Humidity: < 80% RH

Storage conditions Temperature: 10 to 50oC (14 to 140oF); Humidity: < 80% RH

Dimensions 165 x 76 x 43mm (6.5 x 3.0 x 1.7")

Weight Approx. 403g (14.2 oz.) with battery installed

Low battery indication   appears on the LCD

Power supply 9V battery

ISO 9001 Certified

www. .com information@itm.com1.800.561.8187

LT300-EU-EN V2.3 2/13

Appendix

Typical Light Levels

Lux Foot

Candles

Lux Foot

Candles

Factories Home

20 75 2 7 Emergency Stairs, Warehouse 100 150 10 15 Washing

75 150 7 15 Exit/Entrance Passages 150 200 15 20 Recreational

Activities

150 300 15 30 Packing Work 200 300 20 30 Drawing Room,

Table

300 750 30 75 Visual Work: Production Line 300 500 30 50 Makeup

750 1,500 75 150 Typesetting: Inspection Work 500 1,500 50 150 Reading, Study

1,500 3,000 150 300 Electronic Assembly, Drafting 1,000 2,000 100 200 Sewing

Office Restaurant

75 100 7 10 Indoor Emergency Stairs 75 150 7 15 Corridor Stairs

100 200 10 20 Corridor Stairs 150 300 15 30 Entrance,

Wash Room

200 750 20 75 Conference,

Reception Room

300 750 30 75 Cooking Room,

Dining Table

750 1,500 75 150 Clerical Work 750 1,500 75 150 Show Window

1,500 2,000 150 2000 Typing, Drafting

Store Hospital

75 150 7 15 Indoors 30 75 3 7 Emergency Stairs

150 200 15 20 Corridor/Stairs 75 100 7 10 Stairs

200 300 20 30 Reception 100 150 10 15 Sick Room,

Warehouse

300 500 30 50 Display Stand 150 200 15 20 Waiting Room

500 750 50 75 Elevator 200 750 20 75 Medical Exam Room

750 1,500 75 150 Show Window,

Packing Table

750 1,500 75 150 Operating Room

1,500 3,000 150 300 Storefront, Show Window 5,000 10,000 500 1000 Eye Inspection

Spectral Sensitivity

400 450 500 550 600 650 700

Wavelength (nm)

- - - - - Light Meter Response _____ CIE Response

0.8

0.6

0.4

0.2

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