以下为句子列表：
英文: Sampling frequency and time constant of phase-locked amplifier were increased by using microcomputer.
中文: 采用计算机采样，提高了采样频率和锁相放大器的时间常数。
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英文: The paper proceeds from the transient equation for voltage and torque, analyze the electromechanic time constant of permanent-magnet DC servomotors based on the theory, and compare with the several testing methods which are used normal in the engineering,
中文: 摘要为了准确评价伺服电动机的动态性能指标，从电机的电压、转矩平衡方程式出发，在理论上对永磁直流伺服电动机的时间常数进行了分析探讨，并对工程实际中常用的几种测试方法进行分析和比较，指出其差别和适用范围以及可能造成的测试误差。
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