Digital Light Meter
Contents
1. General Specifications Display Over range indication Spectral response Spectral accuracy Multi function 3 3 4 3999 digit LCD with Bargraph indicator LCD displays OL CIE photopic CIE human eye response curve CIE VA function 6 Measurement Repeatability 2 Temperature coefficient Sampling rate Photo detector Peak Hold Operating conditions Storage conditions Dimensions Weight Low battery indication Power supply 0 1 per C 13 3 times per second bargraph 1 3 times per second digital display Silicon photo diode with spectral response filter Capture light peaks to 1018 Temperature 32 to 104 F 0 to 40 C Humidity lt 80 RH Temperature 14 to 140 F 10 to 50 C Humidity lt 80 RH 6 5 x 3 0 x 1 7 165 x 76 x 43mm Approx 14 2 403g with battery installed 4 appears the LCD 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 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest versio2. Reception 100 150 10 15 Sick Room Warehouse 300 500 30 50 Display Stand 150 200 15 20 500 750 50 75 Elevator 200 750 20 75 Medical Exam Room 750 1 500 75 150 Show Window 750 1 500 75 150 Operating Room Packing Table f 1 500 3 000 150 300 Storefront Show Window 5 000 10 000 500 1000 Eye Inspection Spectral Sensitivity 0 8 lt 0 0 6 0 4 050 0 500 o 400 450 500 550 600 650 700 Wavelength nm Light Meter Response CIE Response 6 LT300 V2 0 6 06
3. 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 button 7 RESET button 8 LCD Backlight button EXTECH 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 2 LT300 V2 0 6 06 Light sensor 1 The light sensor is permanently gm attached to the meter by the coiled cable 2 Remove the protective cap by unsnapping it to expose 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
4. 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 again to cycle through MAX and MIN displays 5 To exi
5. User Guide EXT INSTRUMENTS Digital Light Meter Model LT300 MANU HOLD 2 4 1 i 1 wi 3888 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 become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit 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 transit 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 Extech 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 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
6. n 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 Support line 781 890 7440 Copyright 2006 Extech Instruments Corporation rights reserved including the right of reproduction in whole or in part in any form 5 LT300 V2 0 6 06 Appendix Typical Light Levels LER LL IR Candles Candles 1 Fetres 2075 27 5 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 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 L fie J Restaurant 75 00 7 10 Indoor Emergency Stairs 75450 7 15 Corridor Stairs pem OL mam Wash Room LEE CEN UAE 8 Reception Room Dining Table 750 1 500 75 150 ClericalWork 750 1 500 75 150 ShowWindow 1 500 2 000 150 2000 Typing Drafing M o y L Store 1 Hospital 75 150 7 15 Indoors 3075 37 Emergency Stairs 150 200 1520 Corridor Stairs 75400 7 10 Stairs 200 300 20 30
7. t 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 3 LT300 V2 0 6 06 Peak Hold The Peak Hold feature allows the meter to captures light pulses that rise or fall down to 10us 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 values 4 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 but
8. ton 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 The RESET will also reset the auto power off timer Backlight Press the gg 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 Iwill 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 4 LT300 V2 0 6 06 Specifications Ranges and Resolution Accuracy Lux 40 00 400 0 4000 40 00 200 0kLux 5 Rdg 0 5 Full Scale Foot candle Fc 40 00 400 0 4000 20 00kFc 5 Rdg 0 5 Full Scale
Download Pdf Manuals
Related Search