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Short circuit detecting method and short circuit detecting device

A technology for short-circuit detection and signal under test, applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problems of complex circuit structure and large number of signal lines, and achieve the effect of convenient maintenance

Inactive Publication Date: 2010-04-21
武汉长江计算科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0007] It can be seen that the circuit structure of computers, communication equipment, data exchange and other equipment is relatively complex, and the number of signal lines on the circuit board is very large, especially on the backplane of the equipment.

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  • Short circuit detecting method and short circuit detecting device

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] The invention uses a microprocessor to scan and output the tested signal line, and simultaneously detects the input state of the tested signal line to judge whether the detected signal line is short-circuited with the scanned output signal line. According to the difference of the scan level output to the signal line under test, there are two scan detection methods, which are described as follows:

[0031] High level detection method:

[0032] 1) First, pull down all the signal lines under test to the ground respectively;

[0033] 2) It is controlled by the microprocessor to output "1" (high level) to one of the tested signal lines, and the other tested signal lines output high impedance, and then read whether the state of all the tested signal lines is "0" or "1" (high or low). Since all the signal lines under test are pulled down to the ground, if ...

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Abstract

The invention discloses a short circuit detecting method and a short circuit detecting device, which relate to the field of circuit detecting technology. A short-circuit state between detected signal lines is judged by scanning and outputting the detected signal lines and reading the input state of the detected signal lines. The device comprises a microprocessor control unit, an output latch unit, an input buffer unit and the like, wherein the output latch unit and the input buffer unit are connected with the detected lines at the same time; and each input of the input buffer unit pulls up a resistor to a power supply or pulls down a resistor to the ground respectively. By using the method and the device of the invention, a short-circuit condition between the signal lines on a circuit board can be detected and reported quickly; the maintenance is convenient; the work efficiency of the links, such as research and development, production, maintenance and the like of electronic equipment can be greatly improved; and the method and the device are particularly suitable for detecting a backboard of a high-density and complex computer, and communication and data exchange equipment.

Description

technical field [0001] The invention relates to the technical field of circuit detection, in particular to a short circuit detection method and a short circuit detection device. The short-circuit detection device is used for short-circuit detection of circuit board signal terminals or signal lines with complex circuit structures such as computers, communication equipment, and data exchange equipment, and is especially applied to the detection of high-density backplane signal short circuits. Background technique [0002] In the research and development, production and maintenance of electronic equipment, before the equipment or single board is assembled and powered on, it is usually necessary to check the short circuit between the signal lines on the circuit board to avoid damage to the equipment caused by abnormal short circuits between the signal lines. Failure, device burnout and other losses. [0003] The usual inspection method is to use a multimeter to test the resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 吕建新徐爱波梁红文
Owner 武汉长江计算科技有限公司
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