Online fault diagnostic apparatus for circuit board

Abstract

The invention relates to an online fault diagnostic apparatus for a circuit board. The online fault diagnostic apparatus comprises an upper computer and a lower computer, wherein the upper computer is used for performing online signal processing and fault diagnosis, the lower computer is used for providing needed signals for a tested circuit board and uploading test information, and the upper computer and the lower computer are connected and communicated by using a serial bus. The lower computer comprises a CPU (Central Processing Unit) board, a switching power board, a relay switch matrix board, an analog switch matrix board, a digital signal board, A / D (Analog to Digital) and D / A (Digital to Analog) boards, an interface device and a detector, wherein all functional circuit boards are mutually connected in the manner of a system bus, the interface device, the relay switch matrix board and the A / D and D / A boards are electrically connected, and the detector and the CPU board are electrically connected. The invention has strong universality, flexible assembly, simple operation and high fault diagnosis ratio and is suitable for the online fault diagnosis and location of the circuit boards in various industries.

Description

technical field [0001] The invention relates to an electronic detection device, in particular to an online fault diagnosis instrument for circuit boards. Background technique [0002] As an important part of complex equipment, electronic equipment has the characteristics of complex system, high technical content, and high failure rate. Once the electronic equipment fails, it will greatly affect the normal operation of the entire equipment. It is of great significance to quickly and accurately locate the fault of the circuit board, and then repair it in time. [0003] The development of circuit board fault diagnosis equipment has a history of many years. At present, there are mainly two detection devices: an online fault diagnosis instrument for testing components one by one and a fault diagnosis instrument for testing circuit boards. The fault diagnosis instrument for detecting electronic components is based on post-drive technology, and uses fixtures to test all electronic...

AI Technical Summary

Problems solved by technology

Among them, PCI and ISA are the internal buses of the computer. The ISA bus appeared earlier and is no longer used. The PCI bus is faster, but it can only be used in desktop computers and cannot meet the requirements of portability; the IEEE488.2 bus belongs to independent instrument control. bus, but the price of independent instruments with its interface is relatively high, it cannot be used in portable applications, and is not suitable for popularization and use; fault diagnosis instruments based on VXI, PXI and CompactPCI buses are a set of completely independent test systems based on computers and industrial computers. There is an independent chassis with good performance, but VXI is suitable for large-scale general-purpose test projects, with high cost and poor portability

The structure of PXI and CompactPCI is small, but the design of the bus cannot be changed, and it cannot adapt to the diversity of the measured signals, the diversity of the number and types of the measured objects, and the diversity of the excitation signals, so it is not suitable for practical use.

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