User Manual

Reference information
Accuracy equations
The following table lists formulas for calculating the accuracy specification for
each measurement.
In the following equations:
It is assumed the waveform measured is a sine wave.
V is the voltage measured in volts.
A is the current measured in amperes.
Θ is the phase angle in degrees (phase of the current with reference to the
voltage).
Table 16: Measurement accuracy
Parameter Description
1
V
cf
Accuracy
(valid for a crest factor of 1 to 10)
A
cf
Accuracy
(valid for a crest factor of 1 to 10)
Power – W, VA, VA
r
, and PF
W A ccuracy
VA Accuracy
VA
r
Accuracy
PF Accuracy
Fundamental Power – W
f
,VA
f
,VA
rf
, and PF
f
W
f
Accuracy
VA
f
Accuracy
VA
rf
Accuracy
PF
f
Accuracy
Distortion – DF, THD, and TIF
DF A ccuracy
THD A
ccuracy
PA3000 Power Analyzer User Manual 141