Extech Instruments IR267 - Measurement Guidance; Over-range Indicator Meanings; Locating Temperature HotCold Spots; Understanding Field of View

IR267‐en‐GB_v1.18/16
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Over‐rangeIndicators(O Land‐OL)
Ifthetemperaturemeasurementexceeds1112°F(600°C),thethermometerwilldisplayOLin
placeofatemperaturereading.Ifthe temperaturemeasurementisbelow‐58°F(‐50°C),the
thermometerwilldisplay‐OLinplaceofatemperaturereading.
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LocatingHotorColdSpots
Todetectahotorcoldspot,aimthethermometerataregionbeyondthetargetandthenscan
theentireregioninaslow,up/downmotion.Aimthelaserpointerapproximatelyahalfinch
belowthepointoftest.
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DistancetoSpotRatio(FieldofView)
Themeter’sfieldofviewis12:1(distancetospotratio).Forexample,ifthemeteris24inches 
fromthetarget(spot),thediameterofthetargetmustbeatleast2inches.Otherdistancesare
shownbelowinthefieldofviewdiagram.
Notethatmeasurementsshouldnormallybemade<2feetfromthetarget.Themetercan
measurefromfurtherdistancesbutthemeasurementmaybeaffectedbyexternalsourcesof
light.Inaddition,thespotsizemaybesolargethatitencompassessurfaceareasnotintended
tobemeasured.
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Itisnecessarytoensurethatthesizeofthetargetislargerthanthespotsize.Thesmallerthe
target,thecloserthedistanceshouldbe.Seetheaccompanyingdiagram.
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