Watt And Strw Tests - Voltech AT5600 User Manual

C H A P T E R 1 0 – S P E C I F I C A T I O N S
10.2.15.
The accuracy of the applied test voltage is 2%. The measurement accuracy is
based on the chosen test conditions, and is given by:
where:
where:
where:
and:
where:
AT5600 User Manual 98-119 issue 30

WATT and STRW Tests

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���� ���� ���� ����
is the total accuracy (%)
A
T
is the basic relative accuracy (%)
A
R
A is the calibration accuracy (%)
C
is the correction for voltage level (%)
A
V
is the correction for current level (%)
A
I
is the correction for power factor (%)
A
PF
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0.001 %
���� = 0.80 % + (
��������
����
0.01 %
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����
����
����
0.01 %
���� = 0.05 % + (
����
����
����
� ( 1 − ��������
���� = 1.0 % ∗ (
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��������
is the test frequency (Hz)
F
M
is the measured voltage (V)
V
M
I is the measured current (A)
M
is the power factor of the load.
PF
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�������� =
��������
is the measured power (W)
W
is the product of test voltage and magnetizing current.
VA
+ ����
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)
)
) + (1.0 % ∗ ���� ���� )
)
2
)
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