Galvanic current method for measuring electrodeposition velocity of immersion silver plating for printed circuit board;
一种新的印刷电路板浸银镀速的测定方法
Finishing of printed circuit board in ethylenediamine-containing immersion silver system;
印刷电路板的乙二胺络合浸镀银工艺
Integrated treatment and reuse of wastewater from printed circuit board production;
印刷电路板生产废水的综合治理及废水回用
The Recovery of EDTA in Waste PCB Chemical-copper Solution;
印刷电路板化学镀铜液回收EDTA的研究
The Strain Electrical Measurement of Automatism Incising Machine with PCB;
自动切割机切割印刷电路板应变电测量
Hardware System of PCB Flying Probe Checking up System;
印刷电路板飞针检测硬件系统
This paper recommends some methods to improve the performance of digital system when designing printed circuit board(PCB).
针对高速、高精度数字系统对电磁兼容性的严格要求,分析了系统电源、地的重要性以及影响高速模数转换器(ADC)和数模转换器(DAC)电路性能的主要因素;在设计印刷电路板时,采用隔离数字部分与模拟部分、抑制地弹噪声等方法优化系统电源,通过改善ABC、DAC电路的供电方式、优化采样时钟和高速数字信号线来提高系统抗电磁干扰的能力;并比较了一个失败案例和一个成功案例,后者较前者带外抑制指标提高约15dB,表明采用所述方法可以有效改善数字系统的电磁兼容性。
Characterization of pyrolysis of waste printed circuit boards by high-resolution pyrolysis gas chromatography-mass spectrometry;
废弃印刷电路板材料裂解产物的高分辨裂解气相色谱-质谱分析
In order to solve the problem of secondary pollution during crushing of discarded printed circuit boards(PCB),pyrolysis behavior and corresponding pyrolysis products of discarded PCB were mensurated using TG-FTIR analysis system.
为了有效解决废弃印刷电路板在破碎过程中的二次污染问题,应用热重-红外(TG-FT IR)分析系统测定了电路板热解行为以及相应的气体产物。
A new method of measurement on near field electromagnetic radiation of printed circuit boards is described with the basic principle of its operation discussed.
文中主要阐述了一种测量印刷电路板近场电磁辐射的新方法，讨论了此种方法的基本工作原理。
Employing the machine vision system of a mounter, the location error of the first printed circuit board (PCB) can be a (eliminated) firstly by teaching method, then the location error and fabrication error of the other PCB s can be eliminated by identifying the shape, calculating the coordinate of the fiducial mark and comparing with the first PCB.
利用贴片机视觉系统,首先通过示教的方法消除第1块印刷电路板(PCB)的定位误差,然后利用对PCB板基准点的图像识别与计算,消除其余PCB板的定位误差和制造误差,从而保证了贴片机的重复贴装精度。
Feeder assignment problem is one critical problem of placement machine assembling printed circuit board (PCB).
供料器分配问题是贴片机贴装印刷电路板(PCB)中的一个关键问题,它直接影响贴片机生产效率的高低。
A concept of equivalent permittivity for the planar structure of printed circuit board (PCB) was presented.
提出了用于印刷电路板 ( PCB)扁平多层介质结构的等效介电常数的概念 ,使在 PCB结构中电容提取的计算量减少到自由空间中电容提取的量级 ,并保持相当的精度 ,此外还可与目前计算电容效率最高的多极加速法兼容 。