Extech Instruments 401021 (Fc) Manual

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4 Model 401020 and 401021-EN v2.0 8/13

4.OPERATION

4.1InsurethatafreshbatteryisinstalledbymovingthePower/RangeSelectswitchfromtheOFF

positiontooneoftherangeselectpositions;ifthePowerONlightdoesnotswitchONoriftheLow

BatteryLEDdoesswitchON,pleasecheckthebattery.

4.2Connecttheadapter

bananaplugstotheCOMMONandVOLTAGEinputsofamultimeter.The

polarityoftheconnectionshouldbereversedifanegativelightlevelreadingisindicatedonthe

multimeter.

4.3SetthemultimetertothemV(orhigher)DCvoltageposition.Adjusttherangetosuitthe

displayneeds

oftheapplication.Iftheoptionisavailabledonotusethemultimeterauto ‐range

function.

4.4SelectthemaximumrangeontheadapterusingtheRangeSelectSwitchandthenmovelower

inrangeasneeded.

4.5HoldtheLightSensorsothatitfaces(inaperpendicularorientation)thelightsourcetobe

measured.Themultimeterdisplaywill

indicatethelightlevelreadings.RefertoSections5and6

foradditionalmeasurementconsiderations.

5.CORRECTIONFACTORFORVARIOUSLIGHTINGTYPES

Thelightadapteriscalibratedusingaprecisestandardtungstenlightsourceof2856

K.Ifthe

adapteristomeasureadifferenttypeoflighting,thecorrectionfactorshownintheaccompanying

tableshouldbeappliedtothereadings.Multiplythemultimeterreadingbythefactorlistedinthe

rightcolumnofthetableforthelightingtypeshownintheleftcolumn.



Lighting Type Multiplication Factor

MERCURY LAMP x1.14

FLUORESCENT LAMP x1.08

DAYLIGHT x1.00

SODIUM x1.22

METAL HALIDE x1.00