对于电介质来说，它是介电常数和介质损耗角的正切的乘积，这是对出现在电介质中的热效应的量度。

Of a dielectric the product of dielectric constant and the tangent of its dielectric loss Angle; a measure of the heating effect which occurs in dielectrics.

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电气设备绝缘预防性试验中的介质损失角正切的测量，则是一种使用较多而且对判断绝缘较为有效的方法。

The measurement of dielectric loss angle is one of the main methods in the preventive tests for the insulation of electrical equipment.

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介绍了利用微带电路来确定一组高性能、高频印刷电路板材料的介电常数和损耗角正切的方法，且给出了一组印刷电路板材料的特性测量值。

The paper introduces measurements about dielectric constant and tangential loss angle of a group of good function and high frequency printed electronic circuit plate with microstrip circuit.

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