为了提高油料计量的精度，对在线流量计必须进行周期检定。
To improve the fuel metering accuracy, flowmeter must be calibrated periodically.
编制计量器具周期检定计划，申报、筹建自检项目，外送强制检定器具。
Work out plans for periodic calibrating instrument. Arrange to send instrument calibrated by official department.
对雷达检测设备进行周期检定是雷达装备计量保障工作的重要内容之一。
Periodical check-up of the radar test equipment is one of the important tasks of the radar equipment measurement support.
计量器具：计量器具按规定周期检定，各种容器的自重应事先称量准确，并用油漆标明。
Measurement tools: Measurement tools shall be checked regularly according to relevant requirements. The dead weight of various vessels should be made accurate and marked with paint in advance.
反应器安全状况等级为二级，检定周期定为6年。
The safe situation classification of reactor is second class. The detection peroid is 6 years.
长期使用的仪表也应定期检定，其周期应视使用频繁程度和重点程度而定。
Gauges should be inspected periodically after being used for a long time and inspection period is decided according to using frequency and importance degree.
现在，对很多没有计算机操作界面的指针式仪表的检定通常都是由人工来读数和调节，然而，人的眼睛在大量的视觉工作之后会出现视觉疲劳，造成了检定精度低，检定周期长。
But, usually, detecting of the gauge with pointer is by manual work, after long time for vision work, eyes will get tired, and this leads to low detecting precision and long detecting period.
为了确保热电偶温度计测温的准确性，不仅在出厂时要对它进行严格检定，而且在随后的使用过程中还要进行周期性检定。
To ensure the thermocouple's veracity, it must be verified strictly before it is sold, and be calibrated periodically in the process of its use.
为了确保热电偶温度计测温的准确性，不仅在出厂时要对它进行严格检定，而且在随后的使用过程中还要进行周期性检定。
To ensure the thermocouple's veracity, it must be verified strictly before it is sold, and be calibrated periodically in the process of its use.
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