User Manual

LT40-en-GB_V3.0 10/17

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. ZeroCalibrationbutton

3. Maximum/Average/Minimummemorybutton

4. Dataholdbutton

Operation

PowerON/OFF 

LongpressthePowerbuttontopowerthemeter.TopowerthemeterOFF,short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=10.76lux),displayingthismeasuredvalueonitsLCD.

3. Positionthemeterandlightsourcesothatthelightstrikesthesensordomestraighton

(perpendicular)withaslittleanangleaspossible.

4. Themeter’sdisplaycanshowavalueupto9999.However,

forreadingsthatrepresent

measurementshigherthanthis,themeterusesx10orx100feature.Forexample,to

representameasurementof11,000fcthemeterwilldisplay1100withthex10indicator.