Extech Instruments LT505 User manual

USER MANUAL

LUX/FC Light Meter

Model LT505

Additional User Manual Translations available at www.extech.com

LT505-en-GB_V1.1 1/18

Introduction

Thank you for selecting the Extech Model LT505 LUX/FC Light Meter. The LT505 measures light

from fluorescent, metal halide, high-pressure sodium and incandescent sources in lux and foot-

candles. 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

Measure intensity of light (illuminance) in lux or foot-candles

Light sensor with cosine correction

Low battery indicator

Data hold

Auto-ranging

Auto Power OFF (APO)

Light weight, compact, design

Safety

Please read the entire 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 use the meter in the presence of explosive gas or vapor

Do not expose the meter to extremes in temperature or to high humidity

Please dispose of batteries and meter responsibly and in accordance with all applicable

laws and regulations

Do not allow children to handle the meter or the protective cover

Meter and LCD Description

1. Light Sensor (protective sensor cover not shown)

2. LCD

3. LUX-FC button

4. CAL-ZERO button

5. Power button

6. Data Hold button

7. MAX-MIN Record button

Note: Battery compartment and Tripod mount on rear of

meter

LT505-en-GB_V1.1 1/18

1. Battery status

2. Auto Power OFF (APO)

3. Data Hold

4. Maximum reading

5. Average reading

6. Minimum reading

7. Measurement

8. Units of measure

9. Calibration (ZERO)

Operation

Meter Power

Power the meter by long pressing the 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. Short press power button to turn OFF the meter.

Zero Calibrate the Sensor

1. Place the protective cover over the sensor and press the button to power on the meter.

2. If the display does not read ‘0.0’ short press the button.

3. The CAL icon will appear in the secondary display.

4. The CAL icon will switch OFF when the calibration has been completed.

5. If the protective cap is not covering the sensor when the button is pressed, the LCD

display will read “CAP”. In this case, please cover the sensor with the cap and restart this

procedure.

6. It is recommended that the meter be switched off and then on again when repeating the

zero calibration function.

Taking Measurements

Remove the sensor cover and aim the sensor toward the light source. View the measurement on

the meter’s display.

Selecting the Unit of Measure

Press the button to toggle the units between Lux and Foot-candles. The units will indicate in

the display.

Data Hold

Short press the button to freeze or unfreeze a reading on the display.

LT505-en-GB_V1.1 1/18

MAX/MIN Button

The meter records the maximum, minimum, and average readings as described below:

1. Short press the button and the meter will begin tracking the maximum, average, and

minimum measurements. The MAX icon will display at the top of the LCD indicating the

meter is now showing the maximum reading. The reading will not change until a higher

reading is registered.

2. Short press the button again to switch from MAX to AVG, where the meter will show

the average measurement value. The AVG icon will display in the LCD indicating the meter

is now showing the average reading.

3. Short press the button again to change the mode from AVG to MIN, where the meter

will show the minimum measurement value. The MIN icon will display in the LCD indicating

the meter is now showing the minimum reading.

4. Short press the button to step through MAX-AVG-MIN readings.

5. To exit this mode, long press the button. The MAX/AVG/MIN display icons will switch

off, and the meter will return to normal operating mode.

Auto Power OFF (APO)

In order to conserve battery life, the meter will automatically shut off after approximately 12

minutes of inactivity. The icon will appear in the display when APO is enabled.

To turn APO on or off, with the meter powered ON, long press the button. The icon will

appear in the upper LCD when APO is enabled and disappear when APO is disabled.

Measurement Considerations and User Tips

For maximum accuracy allow the light being measured to fall directly on the sensor as

perpendicular as possible with a minimal angle of incidence.

When the meter is not in use, please keep the protective cap over the light sensor. This will

prolong the life of the sensor.

When the meter is to be stored for long periods, please remove the batteries and store them

separately. Batteries can leak and cause damage to the meter’s components.

Avoid areas of high temperature and humidity when using this instrument.

LT505-en-GB_V1.1 1/18

Maintenance

Battery Replacement

1. Power OFF the meter.

2. Press the button that secures the battery compartment at the back of the meter while

sliding the battery compartment cover off in a downward motion.

3. Replace the two (2) ‘AAA’batteries observing correct polarity.

4. 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.

LT505-en-GB_V1.1 1/18

Specifications

Display

9999 count LCD

Sampling rate 2.5 times per second

Light sensor

Silicone photodiode with cosine correction filter

Measurement Units

LUX and FC (Foot candles)

Lighting source types

Fluorescent, metal halide, high-pressure sodium, and

incandescent

Input Overload Display

‘OL’

Tripod mount

On back of meter

Power

2 x 1.5V AAA batteries

Low battery indicator included

Automatic power off

After approx. 12 minutes of inactivity

Operating Temp/Humidity

5°C to 40°C (40°F to 104°F); <80%RH Max

Operating Altitude

2000 meters (7000ft) maximum

Storage Temp/Humidity

-10°C to 60°C (14°F to 140°F); <70%RH Max

Dimensions/Weight

133 x 48 x 23mm (5.3 x 1.9 x 0.9”) /250g (8.8oz)

Safety

For indoor use only. EMC: EN61326-1 (2006), IEC 61000-

4-2 (2008, IEC 61000-4-3 (2006) + (2007); Pollution

Degree 2.

LT505-en-GB_V1.1 1/18

Note: All ranges calibrated to a standard incandescent lamp at color temperature of 2856°K

Electrical Specifications (23±5°C)

Lux (autorange)

Unit

Range

Resolution

Accuracy

Lux

999.9

0.1

±3%rdg + 3 dgts

9 999

±3%rdg +10 dgts

99 990

400 000

100

Foot-candle (autorange)

Unit

Range

Resolution

Accuracy

99.99

0.01

±3%rdg + 3 dgts

999.9

0.1

±3%rdg +10 dgts

9 999

40 000

LT505-en-GB_V1.1 1/18

Appendices

Typical Light Levels (1 Fc = 10.76 Lux)

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

Peak sensitivity wavelength: 550nm;

Deviation from comparative luminosity

standard: JIS standard C1609-1993.

ISO-9001 Certified

www.extech.com

RELATIVE SENSITIVITY (%)

WAVELENGTH (nm)

LT505

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