LED Light Meter

Model LT45

USER GUIDE

Introduction

Congratulations on your purchase of the Extech LT45 LED Light Meter that measures light from LED lamps in addition to fluorescent, metal halide, high-pressure sodium and incandescent sources.

The LT45 is capable of measuring the illumination of white, red, yellow, green, blue, and purple

LEDs up to 400,000 Lux (40,000 Fc).

The LT45 can also calculate luminous intensity (CD) using a distance-to-the-light value programmed by the user in meters or feet units.

The LT45 can store up to 99 readings for later recall and includes Overload indication, Battery status icon, Data hold, Maximum/Average/Minimum (MAX/MIN) tracking, push-button Zero calibration adjustment, Auto Power off (with disable function), and auto ranging 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.

Features



Overload Indication: LCD screen will show “OL” at the upper left-hand corner



Battery strength status indication



Display Update Rate: 2.5 times per second



Spectral response near CIE luminous spectral efficiency ratings



Cosine Angle corrected



Conforms to JIS C 1609:1993 and CNS 5119 general class A Specifications



Measures the intensity of illumination of white, red, yellow, green, blue, and purple LED light and all visible light in Lux or foot-candles



Calculates Luminous Intensity (CD)



Data hold freezes displayed reading



Maximum/Average/Minimum Memory Hold



Zero adjustment



Auto power off with disable function



Automatic range adjust optimizes accuracy and resolution



Manually store/recall up to 99 readings



Complete with light sensor, protective sensor cover, and coiled cable expandable to 59”

(1.5m), 9V battery, and hard shell case

2 LT45-EN v1.4 9/13

Safety



Do not operate the meter in environments where the following are present: explosive gases

(or materials), combustible gases (or materials), steam, or dust.



Please replace the battery immediately when the battery symbol appears on the LCD.



Do not touch the meter’s circuit board for any reason as static electricity or contamination could damage the sensitive components.



For Indoor use only. This instrument was designed for pollution degree 2.



Operation Altitude: Up to 2000m (7000’).

Meter Description

1. Display (LCD)

2. Lux/Fc/CD unit select button

3. MEM/READ button (for 99 reading memory)

4. Up arrow button and MAX/MIN/AVG button

5. Power and Auto Power OFF control button

6. Zero Calibration button

7. Data Hold and Light source select button

8. Down arrow button

9. Coiled sensor connection cable

10. Photo detector

Note: The battery and tripod mount are located on the back of the meter

3 LT45-EN v1.4 9/13

Operation

Power ON-OFF

Momentarily press the Power button to power the meter. To power the meter OFF, momentarily press the Power button again.

Taking Measurements

1. Switch the meter ON

2. Remove the sensor’s protective cover to expose the light sensor dome. The display should switch ON, if not check that fresh batteries are installed.

3. The meter measures the intensity of the light (illuminance) that strikes the sensor dome in foot candles and lux units (1 fc = 10.76 lux) displaying the measured value on the LCD.

4. Use the LUX/FC/CD button to select Lux or Foot candle units (CD, luminous intensity, is explained in the dedicated section ‘Luminous Intensity’). When ‘OL’ is displayed, the measurement exceeds the meter’s range capability.

5. Position the meter and light source so that the light strikes the sensor dome perpendicularly.

6. The meter’s LCD can show a value up to 3999 on the large digits and when more digits are needed to represent the reading two additional (smaller) digits appear to the right of the larger digits, e.g. 3999

00

.

LUX/FC/CD Units

Momentary presses of the LUX/FC/CD button toggles Lux and FC (foot-candles) units. Press and hold the button to enter the CD (luminous intensity) mode. Refer to ‘Luminous Intensity’ section for further information.

Auto Power OFF

To save battery life the meter powers down automatically after approximately 5 minutes of inactivity (no button presses).

Enable/Disable Auto Power Off

With the meter ON, press and hold the Power button until the APO clock symbol switches

OFF (the Auto Power OFF utility is now disabled and the user must manually switch the meter off). To re-enable the Auto Power OFF utility, repeat this process. The Clock symbol will switch

ON when the Auto Power OFF utility is re-enabled.

Zero Calibration

1. Ensure that the protective cover is attached to the light sensor.

2. Power the meter and the LCD should display ‘0’.

3. Momenarily press the “ZERO” button and the ADJ (adjusting) icon will switch ON indicating that the zero adjustment (calibration) is working. When the calibration is finished, the ADJ icon will switch OFF and the meter will return to the normal operating mode.

4. If the protective cap is not covering the sensor when the ZERO calibration is started the LCD display will read “CAP”. In this case, please cover the sensor with the cap and restart this procedure.

4 LT45-EN v1.4 9/13

MAX/AVG/MIN Memory Mode

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

1. Momentarily press the MAX/AVG/MIN button and the meter will begin to track the maximum/average/minimum measurements; the “MIN” icon will display on the LCD indicating that the meter is now displaying the minimum reading. The reading will not change until a lower reading is registered.

2. Press the button again to switch from “MIN” to “MAX” where the meter will show the maximum measurement value. The “MAX” icon will be displayed on the LCD.

3. Press the button again to change the mode from “MAX” to “AVG”, where the meter will show the average of the readings taken since the button was first pressed. The “AVG” icon will be displayed.

4. Press the button again to switch from “AVG” back to “MIN”.

To exit this mode, press and hold the button for at least 2 seconds. The MAX/AVG/MIN icons should all be switched OFF when the unit returns to the normal operating mode.

Memory Record/Read Mode

1. Momentarily press the Mem/Read button to store a reading. The LCD will display a small ‘M’ icon on the lower left-hand area of the LCD along with the memory location number (1 to

99) representing the storage location for the recorded reading. Up to 99 readings can be stored.

2. To review (read) the stored readings, press and hold the Mem/Read button until the ‘MEM’ icon appears at the top of the LCD. Now use the arrow buttons to scroll through the stored readings. The small ‘M’ icon and the memory location counter (1 to 99) will be shown on the lower left-hand corner of the LCD while the main display digits show the stored reading for the selected memory location.

3. To store an average (AVG) reading, first access the AVG mode (See MIN/MAX/AVG section of this guide) and while an average reading is displaying (AVG icon switched ON), momentarily press the Mem/Read button for one second. The LCD will display ‘AVG M’ and the memory location number (1 to 99) indicating that an average reading has been stored in the numbered memory location.

4. When a stored reading is an AVG value, the screen will display ‘AVG’ on the lower left-hand corner.

5. Momentarily press the Mem/Read button to exit the Memory mode and return to the normal operating mode.

6. To clear all 99 memory locations: With the meter switched OFF, press and hold the

Mem/Read and On/Off buttons simultaneously for two seconds. The meter will switch ON

and the screen will display “CLr” indicating that all of the 99 memory locations have been erased.

Data Hold

Press the Hold button to freeze the displayed reading (the ‘HOLD’ icon will switch ON). Press the button again to release the held reading (the ‘HOLD’ icon will switch OFF).

5 LT45-EN v1.4 9/13

Luminous Intensity (CD) Measurements

1. Press the On/Off button to turn power ON.

2. Press and hold the LX/FC/CD button until the meter’s unit designator switches to CD.

3. Use the arrow buttons to select ft (feet) or m (meter) units to represent the distance the sensor will be from the light source.

4. Momentarily press the LX/FC/CD button; the smaller digits (lower-right hand corner of LCD) will switch ON, these digits represent the distance to the light source.

5. Use the arrow buttons to set the distance from the center of the lamp to the measurement base level. Press and hold an arrow button to scroll quickly.

6. Momentarily press the LX/FC/CD button.

7. Remove the protective sensor cap and place the sensor perpendicular to the light at the programmed distance.

8. Read the Luminous Intensity calculation on the meter’s LCD display.

9. Press and hold the LX/FC/CD button to exit this mode.



Luminous Intensity = illumination (Lx) x distance (ft

2

or m

2

)



The programmable distance range is 0.01 ~ 30.47 m (0.01 ~ 99.99 ft.)

Light Source (L.S.) Selection

There are 10 light source selections (L0 – L9) each having a unique calibration correction factor

(multiplier). See the Light Source Factors list below. The multipliers for locations L0 through L6 are fixed for the lighting types listed. Locations L7 through L9 are extra locations that the user can customize (with a multiplier from 0.001 to 1.999). To change the light source (L.S.) selection:

1. Press and hold the Hold/LS button for 2 seconds. The light source code, at the bottom center of the LCD, will flash. Use the arrow buttons to select L0 through L9. The location’s multiplier

(correction factor) will be shown to the right of the Lx value (L8…1000, for example).

2. To customize a location, select L7, L8 or L9 and, once selected, momentarily press the

Hold/LS button to enter the multiplier programming mode. Now use the arrow keys to

change the multiplier. Press and hold an arrow button to scroll faster.

3. When finished, press and hold the Hold/LS button for at least 1 second to confirm the edit and exit this mode.

Light Source Factors

L0: Standard light source: 1.00.

L1: LED white daylight: 0.99.

L2: LED RED light: 0.516.

L3: LED AMBER (YELLOW) light: 0.815.

L4: LED GREEN light: 1.216.

L5: LED BLUE light: 1.475.

L6: LED PURPLE light: 1.148.

L7~L9: Programmable User Custom Locations (preset to 1.00)

6 LT45-EN v1.4 9/13

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 in place, covering the light sensor. This will prolong the life of the sensor.



When the meter is to be stored for long periods, please remove the battery and store it

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

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

Battery Replacement and 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 relative humidity.

Battery Replacement

When the battery power decreases to a critical level, the battery symbol will appear as empty on the LCD. Replace the 9V battery located in the rear battery compartment. The battery compartment slides easily downward for removal (in the direction of the printed arrow on the rear of the meter). Ensure that the compartment cover is securely fastened before using the meter.

Battery Safety Reminders

o Please dispose of batteries responsibly; observe local, state, national regulations. o Never dispose of batteries in a fire; batteries may explode or leak.

7 LT45-EN v1.4 9/13

Specifications

Sampling rate 2.5 times per second (digital display)

Display

Sensor (detector)

Ranges and Resolution

6-digit LCD with battery icon, measurement overload, and other function indicators

Silicon photodiode with spectral response filter and cosine correction

Lux: 399.9, 3999, *3999

9

, *3999

99

Foot-candles: 39.99, 399.9, 3999, *3999

9

*Above 3999, the LCD uses smaller digits on the right side

(1 Fc = 10.76 Lux)

Auto-range

Accuracy

Angle deviation from cosine characteristics

The meter automatically ranges the display

± (3% of reading + 3 digits) up to 500 Lux

± (3%) above 500 Lux

Calibrated to standard incandescent lamp 2856 o

K at an ambient temperature of 73 o

F (23 o

C)

±6% for other visible light sources

30

○

60

○

80

○

±2%

±6%

±25%

LED Types Meter measures white, red, yellow, green, blue, purple LED light

Operating conditions Temperature: 41 to 104 o

F (5 to 40 o

C); Humidity: < 80% RH

Storage Temperature/RH 14 to 140 o

F (-10 to 60 o

C); Humidity: < 70% RH

Battery status indication Battery symbol appears empty when battery voltage reaches critical level

Power supply

Auto Power OFF

Dimensions

9V battery

Meter powers down after 5 minutes of inactivity (can be defeated)

Meter: 1.5 x 2.2 x 5.1” (38 x 55 x 130mm)

Sensor: 9.8 x 2.2 x 3.1” (25 x 44 x 80mm)

Weight

Cable length: 4.9’ (1.5m)

Approx. 8.8 oz. (250g) with battery installed

8 LT45-EN v1.4 9/13

Warranty

FLIR Systems, Inc. warrants this Extech Instruments brand device to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department for authorization. Visit the website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transi t.

This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. FLIR Systems, Inc. specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. FLIR’s total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Calibration, Repair, and Customer Care Services

FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we

sell. NIST certification for most products is also provided. Call the Customer Service Department for information on calibration services available for this product. Annual calibrations should be performed to verify meter performance and accuracy. Technical support and general customer service is also provided, refer to the contact information provided below.

Support Lines: U.S. (877) 439-8324; International: +1 (603) 324-7800

Technical Support: Option 3; E-mail: [email protected]

Repair & Returns: Option 4; E-mail: [email protected]

Product specifications are subject to change without notice

Please visit our website for the most up-to-date information www.extech.com

FLIR Commercial Systems, Inc., 9 Townsend West, Nashua, NH 03063 USA

ISO 9001 Certified

Copyright © 2013 FLIR Systems, Inc.

All rights reserved including the right of reproduction in whole or in part in any form

www.extech.com

9 LT45-EN v1.4 9/13

Garantie

FLIR Systems, Inc. garantit que cet appareil Extech Instruments est exempt de défauts matériaux et de fabrication pendant un an à partir de la date d’envoi (une garantie limitée de six mois s’applique aux capteurs et aux câbles). Si le renvoi de l’appareil pour réparation devient nécessaire durant ou après la période de garantie, contactez le service client pour autorisation. Pour obtenir les coordonnées, visitez le site Web suivant : www.extech.com. Un numéro d’autorisation de retour (AR) doit être délivré avant tout retour de produit. L’expéditeur prend à sa charge les frais d’expédition, le fret, l’assurance et l’emballage correct de l’appareil afin de prévenir toute détérioration durant le transport. Cette garantie ne s’applique pas aux dommages imputables à l’utilisateur, tels que l’usage impropre ou abusif, un mauvais câblage, une utilisation non conforme aux spécifications, un entretien ou une réparation incorrecte, ou toute modification non autorisée. FLIR Systems, Inc. déclinera spécifiquement toute garantie ou qualité marchande ou aptitude à l’emploi prévu, et ne sera en aucun cas tenu responsable pour tout dommage conséquent, direct, indirect ou accidentel. La responsabilité totale de FLIR est limitée à la réparation ou au remplacement du produit. La garantie définie ci-dessus est inclusive et aucune autre garantie, écrite ou orale, n’est exprimée ou implicite.

Calibrage, réparation et services après-vente

FLIR Systems, Inc. offre des services de calibrage et de réparation pour les produits Extech

Instruments que nous commercialisons. Nous fournissons également une certification NIST pour la plupart des produits. Contactez notre service client pour toute information sur les services de calibrage disponibles pour ce produit. Un calibrage doit être effectué chaque année pour vérifier les performances et la précision du mètre. Nous offrons également une assistance technique et un service à la clientèle. Veuillez vous reporter aux coordonnées fournies ci-dessous.

Lignes d’assistance: États-Unis (877) 439-8324; international: +1 (603) 324-7800

Service d’assistance technique : Option 3 ; E-mail : [email protected]

Réparations et retours : Option 4 ; E-mail : [email protected]

Les spécifications produit sont sujettes à modifications sans préavis.

Pour les toutes dernières informations, veuillez visiter notre site Web. www.extech.com

FLIR Commercial Systems, Inc., 9 Townsend West, Nashua, NH 03063 USA

Certifié ISO 9001

Copyright © 2013 FLIR Systems, Inc.

Tous droits réservés, y compris la reproduction partielle ou totale sous quelque forme que ce soit.

www.extech.com

10 LT45-EN v1.4 9/13

Garantía

FLIR Systems, Inc., garantiza este dispositivo marca Extech Instruments para estar libre de defectos en partes o mano de obra durante un año a partir de la fecha de embarque (se aplica una garantía limitada de seis meses para cables y sensores). Si fuera necesario regresar el instrumento para servicio durante o después del periodo de garantía, llame al Departamento de Servicio a

Clientes para obtener autorización. Visite www.extech.com para Información de contacto. Se debe expedir un número de

Autorización de Devolución (AD) antes de regresar cualquier producto. El remitente es responsable de los gastos de embarque, flete, seguro y empaque apropiado para prevenir daños en tránsito. Esta garantía no se aplica a defectos resultantes de las acciones del usuario como el mal uso, alambrado equivocado, operación fuera de las especificaciones, mantenimiento o reparación inadecuada o modificación no autorizada. FLIR Systems, Inc., rechaza específicamente cualesquier garantías implícitas o factibilidad de comercialización o idoneidad para cualquier propósito determinado y no será responsable por cualesquier daños directos, indirectos, incidentales o consecuentes. La responsabilidad total de FLIR está limitada a la reparación o reemplazo del producto. La garantía precedente es inclusiva y no hay otra garantía ya sea escrita u oral, expresa o implícita.

Servicios de calibración, reparación y atención a clientes

FLIR Systems, Inc., ofrece servicios de reparación y calibración para los productos que vendemos

de Extech Instruments. Además ofrecemos certificación NIST para la mayoría de los productos.

Llame al Departamento de Servicio al Cliente para solicitar información de calibración para este producto. Para verificar el funcionamiento y precisión se debe realizar la calibración anual. Además se provee Soporte Técnico y servicios generales al cliente, consulte la información de contacto en seguida.

Líneas de soporte: EE.UU. (877) 439-8324; Internacional: +1 (603) 324-7800

Soporte Técnico Opción 3; correo electrónico: [email protected]

Reparación / Devoluciones: Opción 4; correo electrónico: [email protected]

Las especificaciones del producto están sujetas a cambios sin aviso

Por favor visite nuestra página en Internet para la información más actualizada www.extech.com

FLIR Commercial Systems, Inc., 9 Townsend West, Nashua, NH 03063 USA

Certificado ISO 9001

Copyright © 2013 FLIR Systems, Inc.

Reservados todos los derechos, incluyendo el derecho de reproducción total o parcial en cualquier medio

www.extech.com

11 LT45-EN v1.4 9/13

Appendix

Typical Light Levels

Lux

20-75

75-150

150-300

300-750

750-1,500

1,500-3,000

75-100

100-200

200-750

75-150

150-200

200-300

Foot

Candles

2-7

7-15

15-30

30-75

75-150

Factories

Emergency Stairs, Warehouse

Exit/Entrance Passages

Packing Work

150-300 Electronic Assembly, Drafting

7-10

10-20

20-75

7-15

Visual Work: Production Line

Typesetting: Inspection Work

Office

Indoor Emergency Stairs

Corridor Stairs

Conference,

Reception Room

750-1,500 75-150 Clerical Work

1,500-2,000 150-2000 Typing, Drafting

Indoors

Store

15-20 Corridor/Stairs

20-30 Reception

Lux

100-150

150-200

200-300

Foot

Candles

Home

10-15 Washing

15-20 Recreational

Activities

20-30 Drawing Room,

Table

300-500

500-1,500

30-50 Makeup

50-150 Reading, Study

1,000-2,000 100-200 Sewing

Restaurant

75-150

150-300

300-750

750-1,500

30-75

75-100

100-150

7-15 Corridor Stairs

15-30 Entrance,

Wash Room

30-75 Cooking Room,

Dining Table

75-150 Show Window

3-7

7-10

Emergency Stairs

Stairs

Hospital

10-15 Sick Room,

Warehouse

300-500

500-750

30-50

50-75

Display Stand

Elevator

750-1,500 75-150 Show Window,

Packing Table

1,500-3,000 150-300 Storefront, Show Window

150-200

200-750

750-1,500

15-20 Waiting Room

20-75 Medical Exam Room

75-150 Operating Room

5,000-10,000 500-1000 Eye Inspection

Spectral Sensitivity

Peak sensitivity wavelength: 550nm

LT45

12

WAVELENGTH (nm)

LT45-EN v1.4 9/13