Extech Instruments EA20 Manual

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EA20-EN V1.8 3/14

ManualDatalogging

ClearingTheMemory

1.Pressthebuttontopoweroffthemeter.

2.PressandholddowntheMEMkey,thenpressthekeytopoweronthemeter.Thedisplaywillshow

“CLr”indicatingthatthememoryhasbeenerased.



EnteringAReading

1. PresstheMEMkeytoenterareading.Thedisplaywillmomentarilyshowan“M”andthememorylocation

numberfrom1to99.

2. Whenthememoryisfull,thedisplaywillshow“FULL”.



DataRecall

1. Pressthe“READ”keytoentertheREADmode.TheLCDwillshowan“R”andthememoryaddressnumber.

2. Pressthe“

”keystoscrollthroughthememorylocations.

3. Press“DEW”or“WET”toviewthestoredDewPointorWetBulbtemperature.

4. Pressthe“READ”keytoexitthismode.



Relativemode

Measurementscanbedisplayedasadifferencebetweenactualhumidity/temperatureandstoredreference

values.Tostoreahumidity/temperaturereadinggroupasareference,presstheRELbuttonwhenthe

desiredreferencereadingsareontheLCD(thetriangleiconwillappearsteadyintheupperleft‐handcorner

oftheLCD).

Allsubsequentdisplayedreadingswillbe“relative”tothestoredreferencevalue.Forexample,

ifthereferencevaluesare50.0%&100°Fandtheactualreadingsare53.0%&105°F,themeterwilldisplay

3.0%&5°F.ToexittheRelativemode,pressandholdtheRELbuttonuntilthe

triangleicondisappears.



AutomaticPowerOFF

Themeterautomaticallyshutsoffafteraprogrammedperiodoftime.Toprogramthetimeperiodpressand

holdtheTIMEbuttonwhileturningthemeteron.ReleasetheTIMEbuttonafterthemeterfinishesitsself‐

test.PresstheTIMEbuttontoscrollthroughtheeighttimeselections(shownon

thesmallerdigitsatthe

centeroftheLCD).Selectfromthefollowinglist:0(disabled),1,3,5,10,15,30,or59minutes.PresstheH

buttontostorethedesiredtime.