Digital Light Meter - TRIO Test & Measurement
Contents
1. with battery installed appears on the LCD 9V battery Copyright 2011 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form 5 LT300 EU EN V2 2 2 112. User Guide EXT INSTRUMENTS A FLIR COMPANY Digital Light Meter Model LT300 MANU HOLD 20 ca 4 jo wi yy 7 Backlight 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 MAXMIN 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 2 LT300 EU EN V2 2 2 11 Operation Light sensor 1 The light sensor is permanently 3 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 th
3. e 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 Fe button to select foot candle units Measurement Procedure 1 Remove the protective cap 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 displa
4. egally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle 4 LT300 EU EN V2 2 2 11 Specifications Ranges and Resolution Accuracy Lux 40 00 400 0 4000 40 00k 200 0kLux 5 Rdg 0 5 Full Scale Foot candle Fc 40 00 400 0 4000 20 00kFc 5 Rdg 0 5 Full Scale 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 function f 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 10 5 Temperature 0 to 40 C 32 to 104 F Humidity lt 80 RH Temperature 10 to 50 C 14 to 140 F Humidity lt 80 RH 165 x 76 x 43mm 6 5 x 3 0 x 1 7 Approx 403g 14 2 oz
5. splayed 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 RA 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 f will appear 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 You as the end user are l
6. y 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 3 LT300 EU EN V2 2 2 11 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 To exit the Peak Hold mode press and hold the PEAK button until the Pmax or PIN 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 di
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