Most in - circuit test fixtures use spring - loaded probes and are vacuum actuated 很多在线测试固定装置是带有弹簧的探针或者采用真空启动的。
The tr - 518f board tester is developed to meet the industry needs for sophisticated in - circuit test capability 元件开路空焊问题的先进测试机种。此外,
To perform an in - circuit test , you need a test fixture that connects the circuit nodes on the board under test to the tester 为了完成在线测试,你需要一个测试固定装置,它可以将被测电路板上的节点连接到测试设备上。
And , when coupled with functional testing , the fault coverage for the entire process is as good as or better than in - circuit testing alone 加上功能测试,这个过程中检测到的故障率要比单独进行在线测试故障发现率大。
Because most of the faults found at board test are manufacturing defects , fault coverage for mda tests is nearly as good as fault coverage for in - circuit tests 因为在板级测试中发现的大部分故障都是生产缺陷,生产缺陷分析测试到的故障几乎都可以覆盖在线测试所发现的问题。