8-11
IM WT5000-01EN
Phase Difference Display Format (Phase)
The phase difference Φ between the voltage and current indicates the current phase relative to the voltage of
each element. Set the display format to one of the options below.
• 180 degrees (180 degrees)
If the current phase is in the counterclockwise direction with respect to voltage, the current is leading (D) the
voltage. If the current phase is in the clockwise direction with respect to the voltage, the current is lagging
(G) the voltage. The phase difference is expressed by an angle between 0 and 180° (see appendix 2 in the
Getting Started Guide, IM WT5000-03EN).
• 360 degrees (360 degrees)
The phase difference is expressed as an angle between 0 and 360° in the clockwise direction.
• If the measured voltage or current value is zero, “Error” is displayed.
• Phase difference Φ for lead (Lead) and lag (Lag) is displayed correctly only when both the voltage and
current are sine waves and the ratio of the input to the measurement range is not greatly different between
the voltage and current.
• If the computation result of power factor λ exceeds 1, Φ is displayed as follows:
• If the power factor λ is greater than 1 and less than or equal to 2, Φ returns 0.
• If λ is greater than 2, Φ returns an error (“Error” is displayed).
• For harmonic measurement, the phase differences ΦU and ΦI of harmonic orders 1 to 500 of the voltage
and current are always displayed using an angle between 0 and 180° (no sign for lead and negative sign
for lag).
8 Computation Function
