仪器制造商常常先规定基准严格的初始误差，以便组装后的室温系统无需进行校准。
Often INSTRUMENT manufacturers will specify a reference with a tight initial error so they do not have to perform room-temperature SYSTEMs calibration after assembly.
高精度转速源是为测速发电机的校准测试提供速度基准的驱动系统，具有转速精度高、调速范围宽及无级平滑调速的特点。
The benchmark rev equipment is designed to provide speed reference for tacho generator's testing, which has high velocity precision, wide speed range and stepless speed adjustment.
本文详细研究了基于NTN 校准技术的脉冲波形参数国家基准的不确定度。
Uncertainty of national standard parameter based on NTN technology is discussed detailedly in the dissertation.
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