YOKOGAWA WT310EH User Manual

4-9
IM WT310E-01EN
Measuring Power
1
2
3
4
5
6
7
8
App
Index
Explanation
Computation Functions
There are four types of computation functions: efficiency (WT332E/WT333E only), crest factor, basic
arithmetic, and average active power. The default setting is the crest factor function (CF u1) on the
WT310E/WT310EH and the efficiency function (EFFi) on the WT332E/WT333E.
Efficiency (EFFi; WT332E/WT333E only)
The efficiency of the DUT is computed.
Efficiency Equation
• WT332E
The WT332E/WT333E computes the efficiency by taking the active power measured by element
1 (P1) as the active power applied to the primary side of the inverter and the active power
measured by element 3 (P3) as the power consumed by the secondary side of the inverter.
Inverter
Primary side
P1
Secondary side
P3
Output side
Equation
Efficiency = × 100 (%)
P3
P1
• WT333E
The WT333E computes the efficiency by taking the active power measured by element 2 (P2)
as the active power applied to the primary side of the inverter and the active power measured by
elements 1 and 3 (P1 and P3) as the power consumed by the secondary side of the inverter.
Inverter
Primary side
P2
Secondary side
P1
Output side
P3
Equation
Efficiency = × 100 (%)
P1+P3
P2
Note
Ifthedenominatoroftheaboveequationislessthanorequalto0.0001%oftheratedrange,theefficiency
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

YOKOGAWA WT310EH Specifications

General

Brand	YOKOGAWA
Model	WT310EH
Category	Measuring Instruments
Language	English