User Manual
LT40-en-GB_V3.0 10/17
4
AutoPowerOFF
Tosavebatterylife,themeterpowersdownautomaticallyafterapproximately12minutesof
inactivity.
Enable/DisableAutoPowerOff
WhilethemeterisON,longpressthePowerbuttontodisabletheAutoPowerOFFutility(the
Clocksymbol
willswitchOFF).ToenabletheAutoPowerOFFutility,repeatthisprocess.
LUX/FCButton
PresstheLUX/FCbuttontotogglebetweenLuxandFC(foot‐candles)measurementunits.
MAX/MINButton
Themetercanrecordthemaximum,minimum,andaveragereadingsasdescribedbelow:
1. Shortpressthe“MAX/MIN”buttonandthemeterwillbegintotrackthe
maximum/average/minimummeasurements;the“MAX”iconwilldisplayatthetopofthe
LCDwindowindicatingthatthemeterisnowshowingthemaximumreading.Thereading
willnotchangeuntilahigherreadingisregistered.
2. Pressthe“MAX/MIN”buttonagaintoswitchfrom“MAX”to“AVG”,wherethemeterwill
showtheaveragemeasurementvalue.The“AVG”iconwillbedisplayedabovethedisplayed
value.
3. Pressthe“MAX/MIN”buttonagaintochange
themodefrom“AVG”to“MIN”,wherethe
meterwillshowtheminimumvaluemeasured.The“MIN”iconwillbedisplayed.
4. Pressthe“MAX/MIN”buttonagaintoswitchfrom“MIN”backto“MAX”.
5. Toexitthismode,holdthe“MAX/MIN”buttonforatleast2seconds.TheMAX/AVG/MIN
icons
shouldallbeswitchedOFFwhentheunitreturnstothenormaloperatingmode.
HOLDButton
PresstheHOLDbuttontofreezethecurrentreadingontheLCD.PresstheHOLDbuttonagainto
releasethereading.IntheDataHoldmode,HOLDisdisplayedontheLCD.
ZeroCalibrationProcedure
1. Ensurethattheprotectivecapisattachedtothelightsensor.
2. PowerthemeterandtheLCDshoulddisplay‘0’.
3. Shortpressthe“CALZERO”buttontoperformthezeroadjustment(CALwillappearonthe
display).
4. TheCALdisplaywillswitchoffwhenthecalibration
hasbeencompleted.
5. IftheprotectivecapisnotcoveringthesensorwhentheZerocalibrationisstartedtheLCD
displaywillreadCAP.Inthiscase,pleasecoverthesensorwiththecapandrestartthis
procedure.