YOKOGAWA WT310EH - Page 64

4-10
IM WT310E-01EN
Crest Factor (CF U and CF I)
This instrument determines the voltage or current crest factor by dividing the peak value by the rms
value.
Crest Factor Equations and Displayed Values
• CFu1:TheresultofdividingtheU1peakbytheU1rmsvalueisdisplayed.
• CFu2:TheresultofdividingtheU2peakbytheU2rmsvalueisdisplayed(WT333Eonly).
• CFu3:TheresultofdividingtheU3peakbytheU3rmsvalueisdisplayed(WT332Eand
WT333E).
• CFi1:TheresultofdividingtheI1peakbytheI1rmsvalueisdisplayed.
• CFi2:TheresultofdividingtheI2peakbytheI2rmsvalueisdisplayed(WT333Eonly).
• CFi3:TheresultofdividingtheI3peakbytheI3rmsvalueisdisplayed(WT332EandWT333E).
Note
• Whenthermsvaluefallsto0.5%orless(1%orlessifthecrestfactorissetto6or6A)oftheratedrange
value, the crest factor will be displayed as an error (“Error”).
• YoucancomputethecrestfactorevenwhenthemeasurementmodeisVOLTAGEMEANorDC.
Basic Arithmetic
Therearesixdifferenttypesofcomputationthatyoucanperform(A+B,A–B,A×B,A÷B,A
2
÷B,A
÷B
2
).
ThevaluesofdisplayAanddisplayBareusedinthecomputation,andtheresultsofthecomputation
are shown in display C.
: A + B
: A×B
: A÷B
: A÷B
: A ÷B
2
2
: A – B
Note
• Themeaningsofthedisplayedsymbolsareexplainedbelow.
: + (Addition)
: − (Subtraction)
: × (Multiplication)
: ÷ (Division)
: ^ (exponentiation)
• WhenthefunctiondisplayedindisplayAistheelapsedintegrationtime(TIME),thecomputedresultis
displayed using the no data indication (------).
• Indivision,ifthevalueofthedisplayBfunctionislessthanorequalto0.0001%oftheratedvalue,the
computed value will be displayed as an error (“Error”).
4.5 Displaying the Efficiency (WT332E/WT333E only), Crest Factors, the Results of Computations Using
Basic Arithmetic, and Average Active Powers