Commonly, by opening one switch and closing the other, two group equations are set up to measure rotor earth-fault resistance in the rotor earth-fault protection with switch sampling principle.

切换采样转子一点接地保护，通过两个静态开关一开一合建立两组方程来求解接地电阻与位置。

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The user can switch the sample function on or off, and can also select the time period after which to perform the sampling.

用户可以切换或关闭功能样品，也可以选择时间段之后进行采样。

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The discrepancy between the actual output voltage and expected output voltage of the matrix converter is calculated and added to the switch modulation matrix in the next sampling period as feedback.

该方法将实际输出电压和期望输出电压的比较偏差作为负反馈加到下一个采样周期的开关调制函数矩阵中。

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The difference this new method can make was dramatically illustrated in January when Gallup made its switch from quota sampling.

ECONOMIST: Why the polls got it wrong last time