The article mainly introduces the error analysis, calculation of uncertainty in measuring the error of indication of needle DC voltmeter by DVM.
主要介绍采用“数表法”检定指针式电压表示值的误差分析及测量的不确定度的计算。
Needle valve: it is an important instrument measuring piping system components, mainly cut-off valve and ball valve, its purpose is to open or cut off access by pipeline.
针型阀：是仪表测量管路系统中重要组成部分，主要有截止阀和球阀，其功用是作开启或切断管道通路用。
A new device for measuring run out error of needle valve seat′s cone surface is proposed. The calculating and estimating methods of the error are also described in the paper.
推出了一种新的针阀体座面圆跳动误差测量装置，介绍了误差的计算与评定方法。
In this paper a new method for measuring 3-d displacements, needle projection method with holographic interferometry, is developed.
本文提出一种新的三维位移测量方法：标针投影全息干涉法。
This article mainly analyse the relation of setting and measurement results in needle tubing stiffness measuring test.
本文主要分析针管刚性测量中，设置与测量结果的关系。
A simple needle scanning method for measuring the diameter of laser Gaussian beam is introduced.
本文介绍一种利用金属丝在高斯光场中的横向扫描测量激光束直经的简捷方法。
A simple needle scanning method for measuring the diameter of laser Gaussian beam is introduced.
本文介绍一种利用金属丝在高斯光场中的横向扫描测量激光束直经的简捷方法。
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