LT300

LT300 EXTECH | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 6

Technical content

LT300 V2.0 6/06 2 9 10 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument 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 becom e necessary to return the instrument for service during or beyond the warranty period, c ontact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visi t our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in trans it. 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 r epair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, i ndirect, incidental or consequential damages. Extech'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. Introduction Congratulations on your purchase of the Extech LT300 Digital Light Meter. The LT300 measures light level (illuminance) to 200,000 Lux (20,000 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. 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.

LT300 V2.0 6/06 3 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.

LT300 V2.0 6/06 4 Peak Hold The Peak Hold feature allows the meter to captures light pulses that rise or fall down to 10µs. 1. Press and hold the PEAK button until CAL appears in the display. 2. Momentarily press the PEAK button. The ‘PMAX’ icon will appear on the LCD. The meter will then measure and display any light pulses. The display will hold the results until a higher pulse appears. 3. Press the PEAK button again to display the “PMIN” values. 4. To exit the Peak Hold mode, press and hold the PEAK button until the ‘PMAX’ or ‘PMIN’ icon disappears. Relative mode Measurements can be displayed as a difference between the measured light level and a stored reference value. To store a reading as a reference, press the REL button when the desired reference measurement is on the LCD (the REL icon will switch on). All subsequent displayed readings will be “relative” to the stored reference value. For example, if the reference value is 100 and the actual light level is 125, the meter will display 25. To view the reference value, press the REL button again so that the REL icon begins to flash. The displayed value will be the reference value. To exit the Relative mode, press and hold the REL button until the REL icon disappears. RESET Press the RESET button to clear the memory and exit from REL, HOLD, PEAK and MAX/MIN. The RESET will also reset the auto power off timer. Backlight Press the “ “ button to turn the backlight on. Press again to turn it off. 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.

LT300 V2.0 6/06 5 Support line (781) 890-7440 Technical support: Extension 200; E-mail: support@extech.com Repair & Returns: Extension 210; E-mail: repair@extech.com Product specifications subject to change without notice For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 Specifications Ranges and Resolution Accuracy Lux Foot candle (Fc) 40.00, 400.0, 4000, 20.00kFc ± (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 ‘OL’ Spectral response CIE photopic (C IE human eye response curve) Spectral accuracy CIE V function (f 1 ï 6%) Measurement Repeatability ±2% Temperature coefficient ±0.1% per o C 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: 32 to 104 o F (0 to 40 o C); Humidity: < 80% RH Storage conditions Temperature: 14 to 140 o F (-10 to 50 o C); Humidity: < 80% RH Dimensions 6.5 x 3.0 x 1.7" (165 x 76 x 43mm) Weight Approx. 14.2 oz. (403g) with battery installed Low battery indication “ ” appears on the LCD Power supply 9V battery Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. Copyright © 2006 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.

LT300 V2.0 6/06 6 Appendix Typical Light Levels Lux Foot Candles Lux Foot Candles Factories Home 20-75 2-7 Emergency St airs, 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 Wo rk: 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 R e l a t i v e R e s p o n s e 0.8 0.6 0.4 0.2