C H A P T E R 10 – S P E C I F I C A T I O N S
AT5600 User Manual 98-119 issue 14 Page 223
10.2.15. WATT and STRW Tests
The accuracy of the applied test voltage is 2%.The measurement accuracy is
based on the chosen test conditions, and is given by:
where:
A
T
is the total accuracy (%)
A
R
is the basic relative accuracy (%)
A
C
is the calibration accuracy (%)
A
V
is the correction for voltage level (%)
A
I
is the correction for current level (%)
A
PF
is the correction for power factor (%)
where:
where:
F
M
is the test frequency (Hz)
V
M
is the measured voltage (V)
I
M
is the measured current (A)
PF
is the power factor of the load
and:
where:
W
is the measured power (W)
VA
is the product of test voltage and magnetizing current
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