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39/41B
Users Manual
34
A linear load with no phase shift.
A linear load with phase shift. A narrow ellipsoid in
this pattern usually does not mean there is a
problem. For wider ellipsoids, check power factor
(PF). If the ellipsoid is backwards (upper left to
lower right), check that you have pointed the
current probe in the right direction.
A nonlinear load, usually resulting from pulse-type
power supplies.
A nonlinear load resulting from a 3-phase (six
pulse) rectifier power supply.
A linear load that is 180 degrees out of phase. A
Current Probe pointed in the wrong direction or
reversed polarity voltage leads can cause this
indication. This incorrect alignment will also cause
negative power readings.
A combination of harmonic content and phase shift
of the fundamental frequency.
A pattern indicative of a silicon-controlled rectifier
(SCR) power supply.
a14c.eps
Figure 15. Typical VA Check Signatures