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MEASUREMENTS

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Measuringcentres–M

320,MC330,MC350&MC350H ‐ User’sManual 41

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WARNING!

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When,duetomodeofconnection,unsupportedmeasurementisselectedforcustomized

screenanundefinedvalueisdisplayed.

Explanationofbasicconcepts

Samplefactor−MV

A device measures all primary quantities with sample frequency which cannot exceed a certain number of

samplesinatimeperiod.Basedontheselimitations(65Hz∙128samples)asamplefactoriscalculated.Asample

factor(M

),depending on frequencyofameasuredsignal,definesanumberofperiodsforameasurement

calculationandthusanumberofharmonicsconsideredincalculations.

Averageinterval−MP

DuetoreadabilityofmeasurementsfromLCDandviacommunication,anAverageinterval(M

)iscalculatedwith

regardtothemeasuredsignalfrequency.TheAverageinterval(seechapterAverageintervalonpage41)defines

refreshrateofdisplayedmeasurementsbasedonasamplingfactor.

Powerandenergyflow

Figuresbelowshowaflowofactivepower,reactivepowerandenergyfor4uconnection.

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PLEASENOTE

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Displayofenergyflowdirectioncanbeadjustedtoconnectionandoperationrequirements

bychangingtheEnergyflowdirectionsettingsingeneral/connection(seepage28).

Iskra MC320 User Manual

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