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Users Manual

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

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