Extech Instruments LT40 User Manual Download Page 1 | Manualshive

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USER

GUIDE

LED

Light

Meter

Model

LT45

netzerotools.com

netzerotools.com

netzerotools.com

Extech LT40 LED Light Meter

Extech LT45 Color LED Light Meter

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Summary of Contents for LT40

Page 1: ...USER GUIDE LED Light Meter Model LT45 netzerotools com netzerotools com netzerotools com Extech LT40 LED Light Meter Extech LT45 Color LED Light Meter ...

Page 2: ...se will provide years of reliable service Please visit our website 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...

Page 3: ...e 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 arr...

Page 4: ...rger digits e g 399900 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 P...

Page 5: ...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 lo...

Page 6: ...ce 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 s...

Page 7: ...nd 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 th...

Page 8: ...incandescent lamp 2856 o K at an ambient temperature of 23 o C 6 for other visible light sources 30 2 60 6 Angle deviation from cosine characteristics 80 25 LED Types Meter measures white red yellow green blue purple LED light Operating conditions Temperature 5 to 40 o C 41 to 104 o F Humidity 80 RH Storage Temperature RH 10 to 60 o C 14 to 140 o F Humidity 70 RH Battery status indication Battery ...

Page 9: ...00 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 Wareho...

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