the error of a wattmeter at half full-scale shall not vary by more than 0. 25% of full scale for Precision instruments when the power factor is varied between unity and 0. 5 lagging – Chinese translation

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the error of a wattmeter at half full-scale shall not vary by more than 0. 25% of full scale for Precision instruments when the power factor is varied between unity and 0. 5 lagging

当功率因数在滞后1 ~0,5变化时,功率计在满标度的二分之一处的误差变化不应大于满标度的0,25%; 当功率因数在滞后1 ~0,5变化时; 功率计在满标度的二分之一处的误差变化不应大于满标度的0,25%

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