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Method for searching channel number of on-line tester

A channel number and tester technology, which is applied in the direction of electronic circuit testing, instruments, and measuring electronics, can solve the problems of long channel time, low search efficiency, and increased loss of online testers, so as to save costs, prolong service life, Effect of reducing the number of times to measure the comparison voltage

Inactive Publication Date: 2011-01-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. The average time to search for channels is long, especially when there are many channel boards, the total number of channels increases, and multiple comparison voltage measurements are required, and the search efficiency is low
[0010] 2. Due to the large number of F relays, the relays of the channel board need to be closed and opened frequently, which increases the loss of the online tester and greatly reduces the service life of the online tester

Method used

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  • Method for searching channel number of on-line tester
  • Method for searching channel number of on-line tester
  • Method for searching channel number of on-line tester

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] The channel number search method of the online tester of the present invention is divided into three steps:

[0042] The first step is to use the memory search method to find the serial number of the channel board where the grounding channel is located, that is, the serial number of the target channel board, and the grounding channel is any channel on the channel board.

[0043] In the second step, the serial number of the relay connected to the ground channel on the target channel board is searched by using the half-search method, that is, the serial number of the target relay.

[0044] In the third step, the channel number of the grounding channel is calculated according to the channel number calculation formula.

[0045] In the search process, each search range is reduced by half compared with the last time, this method...

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Abstract

The invention discloses a channel number search method of online tester, belonging to the online test technical field of printed circuit board, which mainly comprises searching a grounding channel in all channel boards of an online tester, calculating out the channel number of the grounding channel, recording the serial number of the target channel board of the grounding channel, when in next search of channel number, first searching the grounding channel in the channel boards with recorded serial numbers, and calculating the channel number of the grounding channel. The invention can reduce the search range of target channel board in the search of channel number, accelerate the search speed of target relay and improve search efficiency. The invention can reduce the comparison times between public terminal voltage and zero threshold value in the search of channel number, to improve search speed and prolong the service life of online tester.

Description

technical field [0001] The invention relates to a method for online testing of printed circuit boards, in particular to a method for quickly searching channel numbers on an online tester. Background technique [0002] In-Circuit Test (ICT) is a standard test method to check whether there are defects in the printed circuit board and whether the components are good by testing the electrical properties and electrical connections of the online components. The open and short circuit conditions of individual components and each circuit network. An online tester is a device that provides online testing. [0003] The online tester implants a probe in each circuit network of the single board to be tested, and each probe is connected to a channel of the online tester. The online tester controls the voltage on the probe through the channel to achieve the purpose of controlling the network voltage of the single board under test, and each channel will have a channel number to mark its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/28G01R31/02
Inventor 廖继红
Owner ZTE CORP