AEMC 407 User Manual page 71

Note (4) Any power measured less than 5W is regarded as zero and causes the
display of dashes "----"
If the voltage is less than 0.15V or if the current is less than 0.15A, the
power measured is regarded as zero and causes the display of "----"
Note 5 The active powers are positive for power consumed and negative for
power generated.
Note 6 The signs of the active and reactive powers and power factor are
defined by the four-quadrant rule:
The diagram below sums up the signs of the power as a function of the
phase angle between V and I:
Quadrant 1: Active power P
Quadrant 2: Active power P
Quadrant 3: Active power P
Quadrant 4: Active power P
Note (7) In balanced three-phases, with deformed signals (THD and
harmonics), uncertainties are guaranteed since Ф > 30°. Additional
errors are following, depending of THD:
Add +1% for 10% < THD < 20%
Add +3% for 20% < THD < 30%
Add +5% for 30% < THD < 40%
Generated
sign + (power consumed)
sign - (power generated)
sign - (power generated)
sign + (power consumed)
Consumed
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