试验后：施加标称电压30分钟，于24至48小时之间测试。
After test: URto be applied for 30 minutes, 24 to 48 hours before measurement.
本文在介绍了电压光纤通信的特点，优化了光纤通信的接口电路的基础上，并设计了一套样机进行了试验和测试。
Based on the advantages of optical fiber communication and improvement of the interface circuit, a experimental model has been used for experiment and measurement.
因此，在三相感应电动机的型式试验中，首先必须测试电源电压的波形畸变率。
Therefore the wave form aberration rate must first be tested in the full scale test of tree? Phase induction motor.
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