Extech Instruments LT45 User Guide

LT45-EU-EN v1.4 9/13
6
LuminousIntensity(CD)Measurements
1. PresstheOn/OffbuttontoturnpowerON.
2. PressandholdtheLX/FC/CDbuttonuntilthemeter’sunitdesignatorswitchestoCD.
3. Usethearrowbuttonstoselectft(feet)orm(meter)unitstorepresentthedistancethe
sensorwillbefromthelightsource.
4. MomentarilypresstheLX/FC/CDbutton;thesmallerdigits(lo
wer‐righthandcornerofLCD)
willswitchON,thesedigitsrepresentthedistancetothelightsource.
5. Usethearrowbuttonstosetthedistancefromthecenterofthelamptothemeasurement
baselevel.Pressandholdanarrowbuttontoscrollquickly.
6. MomentarilypresstheLX/FC/CDbutton.
7. Removetheprotectivesensorcapandplacethesensorperpendiculartothelightatthe
programmeddistance.
8. ReadtheLuminousIntensitycalculationonthemeter’sLCDdisplay.
9. PressandholdtheLX/FC/CDbuttontoexitthismode.
 LuminousIntensity=illumination(Lx)xdistance(ft
2
orm
2
)
 Theprogrammabledistancerangeis0.01~30.47m(0.01~99.99ft.)
LightSource(L.S.)Selection
Thereare10lightsource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seconds.Thelightsourcecode,atthebottomcenter
oftheLCD,willflash.UsethearrowbuttonstoselectL0throughL9.Thelocation’smultiplier
(correctionfactor)willbeshowntotherightoftheLxvalue(L8…1000,forexample).
2. To
customizealocation,selectL7,L8orL9and,onceselected,momentarilypressthe
Hold/LSbuttontoenterthemultiplierprogrammingmode.Nowusethearrowkeysto
changethemultiplier.Pressandholdanarrowbuttontoscrollfaster.
3. Whenfinished,pressandholdtheHold/LSbuttonforatleast1secondtoconfirmtheedit
andexitthismode.
LightSourceFactors
L0:Standardlightsource:1.00.
L1:LEDwhitedaylight:0.99.
L2:LEDREDlight:0.516.
L3:LEDAMBER(YELLOW)light:0.815.
L4:LEDGREENlight
:1.216.
L5:LEDBLUElig
ht:1.475.
L6:LEDPURPLElight:1.148.
L7~L9:ProgrammableUserCustomLocations(presetto1.00)
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Extech Instruments LT45 Specifications

General

Brand	Extech Instruments
Model	LT45
Category	Measuring Instruments
Language	English