Ametek TR-2100 - Page 84

TR-2100 User Manual 78
Reactive Power
Reactive power is derived from the apparent and real powers.
Q
SP
=−
22
Power Factor
True power factor is the ratio of real to apparent power.
True
PF
P
S
=
Total Harmonic Distortion (THD)
The THD for an input is derived from the RMS and vector magnitude (V)
100%
22
x
V
VRMS
THD
−
=
This is the IEEE form of THD. In DSA32, the calculation of THD can be selected from
either the IEEE or ANSI standard. Refer to the DSA help file for a complete explanation of
the differences.