Voltech AT5600, Руководство пользователя

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C H A P T E R 1 0 – 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:
𝐴
𝑇
= 𝐴
𝑅
+ 𝐴
𝐶
+ 𝐴
𝑉
+ 𝐴
𝐼
+ 𝐴
𝑃𝐹
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:
𝐴
𝑅
= 0.30 % 𝑓𝑜𝑟 𝑊𝐴𝑇𝑇 𝑜𝑟 1.00 % 𝑓𝑜𝑟 𝑆𝑇𝑅𝑊
𝐴
𝐶
= 0.80 % + (
0.001 %
𝐹𝑚
)
𝐴
𝑉
= 0.05 % + (
0.01 %
𝑉
𝑀
)
𝐴
𝐼
= 0.05 % + (
0.01 %
𝐼
𝑀
) + (1.0 % ∗ 𝐼𝑚)
𝐴
𝑃𝐹
= 1.0 % ∗ (
√(1 − 𝑃𝐹
2
)
𝑃𝐹
)
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:
𝑃𝐹 =
𝑊
𝑉𝐴
where:
W is the measured power (W)
VA is the product of test voltage and magnetizing current