ICT测试原理
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ICT (In Circuit Test)
在线测试
z一种元器件级的测试方法用来测试装配后的电路板上的每个元器件。
z如果功能测试是一种黑盒测试的话，那么在线测试就是一种白盒测试。
ICT 测试设备–Agilent3070
ICT 测试设备–GenRad228x
ICT 测试设备–Teradyne Spectrum
ICT 简易示意图
ICT的优点（相对于FT）* 统一的硬件平台
--易于投资
* 统一的流程
--易于控制
* 速度较快
--当然，这决定于工程师的能力* 故障定位精确
--维修费用较低
* 能抓到电子隐性故障的唯一方法
--提高产品质量
衡量ICT的5大要素* 测试覆盖率。
* 测试时间。
* 稳定性
* 故障定位
* 信息反馈
Agilent ICT Tester
Agilent307x Series 3 Architecture
Testhead Layout
BRC:Bank,Row,Column :20378,203178
Configuring a Four-Module System
Cards
Pin Card
Pin Card
Pin card
ASRU -Rev A,B or C Control ControlPlus ControlXT
System config file
PATH:/hp3070/diagnostic/th1/config
testhead name "testhead1"
line frequency 50
relay 1 controls vacuum 2,3
relay 2 controls vacuum 0,1
bank 1
module 0
cards 1asru
cards 2 hybrid advanced ! double density
cards 3 hybrid advanced ! double density
cards 4 hybrid advanced ! double density
cards 5 hybrid advanced ! double density
cards 6 control plus
cards 7 hybrid advanced ! double density
cards 8 hybrid advanced ! double density
cards 9 hybrid advanced ! double density
cards 10 hybrid advanced ! double density
cards 11 hybrid advanced ! double density
supplies hp6624 13 to 16 !asru channels 1 to 4
ports ext7, ext8
end module
module 1
…….
End module
end bank
bank 2
……
end bank
Board level config file module 2
cards 1asru c revision
cards 2 hybrid standard double density
cards 3 hybrid standard double density
cards 4 hybrid standard double density
cards 5 hybrid standard double density
cards 6 control plus
cards 7 hybrid standard double density
!@ cards 8 hybrid standard double density
!@ cards 9 hybrid standard double density
!@ cards 10 hybrid standard double density
!@ cards 11 hybrid standard double density
supplies 5 to 8
end module
module 3
cards 1asru c revision
!@ cards 2 hybrid standard double density
!@ cards 3 hybrid standard double density
!@ cards 4 hybrid standard double density
!@ cards 5 hybrid standard double density
cards 6 control plus
cards 7 hybrid standard double density
cards 8 hybrid standard double density
cards 9 hybrid standard double density
cards 10 hybrid standard double density
cards 11 hybrid standard double density
supplies 1 to 4
end module