Extech Instruments NON-DISPLAY PORTABLE Dokumentacja Pobierz pdf (Strona 11)

CG204-EU-EN v2.2 8/13

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StatisticalAnalysisConsiderations

Themetercalculatesstatisticsfromamaximumof80readings(ForGroup1throughGroup4,amaximum

of400readingscanbestored).NotethatreadingscannotbestoredwheninDIRECTmode.However,

statisticsonthesereadingscanstillbecalculated.Whenthemeterispoweredofforif

theworkingmodeis

changed(intheprogrammingmenu),theDIRECTmodestatisticswillbelost.Thefollowingstatisticalvalues

canbecalculated:

 NO.:Numberofreadings

 AVG:Averagevalue

 Sdev.:Standarddeviation(squarerootofadataset’svariance)

 MAX:Maximumreading

 MIN:

Minimumreading

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StatisticalTerms

Averagevalue( x )isthesumofreadingsdividedbythenumberofreadings.

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StandardDeviation(Sdev)

Thesamplestandarddeviationisastatisticthatmeasureshowthesamplevalueisdistributedaround

thesamplemean.ThestandarddeviationofasetofnumbersistherootmeansquareofthevarianceS

2

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Thevarianceofalististhesquareofthestandarddeviationofthelist,thatis,theaverageofthe

squaresofthedeviationsofthenumbersinthelistfromtheirmeandividedbythe(numberofreadings‐

1)

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Variance:S

)1/()(

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Standarddeviation:S=

S 

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NOTE:

UsetheDELETEparameterfromtheprogrammingmenuimmediatelyafteranoutlierorerraticreading

hasbeentaken.RefertotheDeletefunctioninProgrammingMenu.

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StorageCapacityOverflow

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InGROUPmode,ifthestoragecapacityisexceeded,stat istics will not beupdated,although

measurementscanstillbemade.Ifthememoryisfull,subsequentreadingswillnotbeincludedinthe

statistics.Themeter’sdisplaywillshow“FULL”(intheSINGLEmeasurementmode).

InDIRECTmode,whenthememory

isfull,thenewestreadingwillreplacetheoldestreadingandthe

statisticswillbeupdated.

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