Iskra MC330 - Explanation of Basic Concepts; Sample Factor − MV; Average Interval − MP; Power and Energy Flow

MEASUREMENTS

Measuringcentres–M
C
320,MC330,MC350&MC350H ‐ User’sManual 41

WARNING!

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
V
),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
P
)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.



PLEASENOTE

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).