飛針測試機電測系統(tǒng)的設計
發(fā)布時間：2018-07-31 09:22
【摘要】：隨著電子產(chǎn)業(yè)的迅猛發(fā)展,PCB電性能指標要求日益提高。傳統(tǒng)的PCB針床測試方式需要較長時間和較高成本制作測試夾具,難以滿足小批量、多種類樣品板和產(chǎn)品頻繁更新?lián)Q代的檢測需求�；谶@些問題,本論文中設計的飛針測試機,根據(jù)PCB的Gerber文件快速生成測試資料,由飛針測試機運動控制系統(tǒng)快速移動測試探針,與機器電測系統(tǒng)互動快速進行PCB電性能測試,有效彌補了針床測試方式的不足。電測系統(tǒng)是飛針測試機的重要組成部分,其性能直接決定了整機的測試效率和精度,在軟硬件設計時必須兼顧這兩個關鍵指標。電測系統(tǒng)檢測PCB缺陷的方法有電容測試法、導通測試法、絕緣測試法、微阻測試法,在研究這些測試方法基礎上整合四種方法,對提高機器整體性能具有重要意義。本文首先論述了飛針測試機的整體架構,分析了制約飛針測試機檢測效率的幾點因素,提出了能改進效率的一套系統(tǒng)架構。然后針對系統(tǒng)架構中的電測系統(tǒng)部分進行了方案制定和具體軟硬件設計。在電測系統(tǒng)設計理論部分,首先分析了飛針的組合方式,確定了微阻測試四線制接線方式,對微阻測量的信號噪聲問題進行了分析,其次對硬件系統(tǒng)進行了選型和設計,主要包括恒流源與高壓測試源電路、AD/DA轉化電路、電容測試電路、信號采集電路、電源電路等部分。在軟件設計部分,主要以STM32F303為控制核心,由它管理測量和通信流程,該部分根據(jù)實際需求制定了通信協(xié)議,給出了硬件初始化、硬件自檢子程序、數(shù)據(jù)采集和中位值濾波等程序的實現(xiàn)流程,并進行了軟件設計。在實驗室對電測系統(tǒng)各個功能進行了測試,驗證了本系統(tǒng)硬軟件設計的可行性,實現(xiàn)了飛針測試機四種電測方法及其整合,達到了電測系統(tǒng)的測量精度和效率的初步要求。此外,在飛針測試機現(xiàn)場進行了聯(lián)調(diào)測試,并且在工控機上分別導出了四種測試方法的測試數(shù)據(jù),對數(shù)據(jù)進行了分析,除去機器本身的脈沖干擾,測試數(shù)據(jù)具有良好的線性度和重復度。測試結果證明,飛針測試機電測系統(tǒng)具有較好的測量精度,并能配合機器運動控制系統(tǒng)進行快速測量。具有良好的應用前景。
[Abstract]:With the rapid development of electronic industry, the requirements of PCB electrical performance index are increasing. The traditional testing method of PCB needle bed needs a long time and high cost to make the test fixture, which is difficult to meet the test demand of small batch, many kinds of sample boards and products frequently updated. Based on these problems, the flying needle tester designed in this paper generates the test data quickly according to the Gerber file of PCB, moves the test probe quickly by the motion control system of the flying needle tester, and interacts with the electrical testing system of the machine to carry out the PCB electrical performance test quickly. Effectively make up for the lack of needle-bed testing. The electric measuring system is an important part of the flying needle tester. Its performance directly determines the testing efficiency and precision of the whole machine. The two key indexes must be taken into account in the design of software and hardware. The methods of detecting PCB defects in electric measuring system include capacitance test, conduction test, insulation test and micro-resistance test. It is of great significance to improve the overall performance of the machine by integrating four methods on the basis of studying these testing methods. This paper first discusses the whole structure of the flying needle tester, analyzes several factors that restrict the testing efficiency of the flying needle tester, and puts forward a set of system architecture which can improve the efficiency of the flying needle tester. Then, the scheme and the hardware and software are designed for the electrical measurement system in the system architecture. In the part of the design theory of the electric measurement system, the combination mode of the flying needle is analyzed, the four-wire connection mode of the micro-resistance test is determined, the signal noise problem of the micro-resistance measurement is analyzed, and the hardware system is selected and designed. It mainly includes AC / DA conversion circuit, capacitance test circuit, signal acquisition circuit, power supply circuit and so on. In the part of software design, STM32F303 is used as the control core, which manages the measurement and communication flow. According to the actual requirements, the communication protocol is established, and the hardware initialization and hardware self-checking subprogram are given. Data acquisition and median value filtering and other programs are implemented, and software design is carried out. The functions of the electric measurement system are tested in the laboratory, the feasibility of the hardware and software design of the system is verified, and the four electric measuring methods and their integration of the flying needle tester are realized, which meet the primary requirements of the measuring accuracy and efficiency of the electric measuring system. In addition, the test data of four kinds of test methods are derived from the field of the flying needle test machine, and the test data are analyzed to remove the pulse interference of the machine itself. The test data have good linearity and repetition. The test results show that the flying needle test electromechanical measurement system has good measurement accuracy and can be quickly measured with the machine motion control system. It has good application prospect.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN41
[Abstract]:With the rapid development of electronic industry, the requirements of PCB electrical performance index are increasing. The traditional testing method of PCB needle bed needs a long time and high cost to make the test fixture, which is difficult to meet the test demand of small batch, many kinds of sample boards and products frequently updated. Based on these problems, the flying needle tester designed in this paper generates the test data quickly according to the Gerber file of PCB, moves the test probe quickly by the motion control system of the flying needle tester, and interacts with the electrical testing system of the machine to carry out the PCB electrical performance test quickly. Effectively make up for the lack of needle-bed testing. The electric measuring system is an important part of the flying needle tester. Its performance directly determines the testing efficiency and precision of the whole machine. The two key indexes must be taken into account in the design of software and hardware. The methods of detecting PCB defects in electric measuring system include capacitance test, conduction test, insulation test and micro-resistance test. It is of great significance to improve the overall performance of the machine by integrating four methods on the basis of studying these testing methods. This paper first discusses the whole structure of the flying needle tester, analyzes several factors that restrict the testing efficiency of the flying needle tester, and puts forward a set of system architecture which can improve the efficiency of the flying needle tester. Then, the scheme and the hardware and software are designed for the electrical measurement system in the system architecture. In the part of the design theory of the electric measurement system, the combination mode of the flying needle is analyzed, the four-wire connection mode of the micro-resistance test is determined, the signal noise problem of the micro-resistance measurement is analyzed, and the hardware system is selected and designed. It mainly includes AC / DA conversion circuit, capacitance test circuit, signal acquisition circuit, power supply circuit and so on. In the part of software design, STM32F303 is used as the control core, which manages the measurement and communication flow. According to the actual requirements, the communication protocol is established, and the hardware initialization and hardware self-checking subprogram are given. Data acquisition and median value filtering and other programs are implemented, and software design is carried out. The functions of the electric measurement system are tested in the laboratory, the feasibility of the hardware and software design of the system is verified, and the four electric measuring methods and their integration of the flying needle tester are realized, which meet the primary requirements of the measuring accuracy and efficiency of the electric measuring system. In addition, the test data of four kinds of test methods are derived from the field of the flying needle test machine, and the test data are analyzed to remove the pulse interference of the machine itself. The test data have good linearity and repetition. The test results show that the flying needle test electromechanical measurement system has good measurement accuracy and can be quickly measured with the machine motion control system. It has good application prospect.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN41
【參考文獻】
相關期刊論文 前10條
1 馮佳;李佩s，
本文編號：2155138
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