USER GUIDE White LED Light Meter Model LT40
Introduction Congratulations on your purchase of the Extech LT40 LED Light Meter that measures light from white LED light, fluorescent, metal halide, high-pressure sodium and incandescent sources. The LT40 can measure light up to 400,000 Lux (40,000 Fc). The LT40 offers an overload indication, low battery indication, Data hold, maximum/average/minimum hold (MAX/MIN), Zero adjustment, auto power off with disable function, and auto ranging features.
Meter Description 1. Photo detector (remove protective cover to expose sensor) 2. Display (LCD) 3. Control push-buttons 4. Power Button: ON/OFF Battery compartment and tripod mount are located on rear of instrument Push-Button Description 1. Lux/Fc units selector 2. Calibration and ZERO button 3. Maximum/Average/Minimum memory button 4. Data hold button 3 LT40-EN v1.
Operation Power ON-OFF Press and hold the Power button for at least 2 seconds and then release to power the meter. To power the meter OFF, momentarily press the Power button. Taking Measurements 1. Switch the meter ON and remove the sensor’s protective cover to expose the light sensor dome. The display should switch ON, if not check that batteries are installed and fresh. 2. The meter measures the intensity of the light (illuminance) that strikes the sensor dome in foot candles and lux units (1 fc = 10.
MAX/MIN Button The meter can record the maximum, minimum, and average readings as described below: 1. Momentarily press the “MAX/MIN” button and the meter will begin to track the maximum/average/minimum measurements; the “MAX” icon will display at the top of the LCD window indicating that the meter is now showing the maximum reading. The reading will not change until a higher reading is registered. 2.
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 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.
Specifications Display 4-digit LCD (maximum display: 3999) with low battery icon, measurement overload, and other function indicators Sensor (detector) Silicon photodiode with spectral response filter and cosine correction Ranges and Resolution Lux: 399.9, 3999, *39 999, *399 999 Foot-candles: 39.99, 399.9, 3999, *39 999 * Readings above 3999 use a x10 or x100 multiplier (1 Fc = 10.
Appendices Typical Light Levels (1 Fc = 10.
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.
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.
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.
