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。
These testers cost less than in - circuit testers , and some manufacturers claim that tests run faster on mdas 这些测试设备所需要的费用要比在线测试设备少,而且有些制造商还宣称在生产缺陷分析设备上,测试速度进行的更快。
In - circuit testers can now also test for solder opens on surface - mounted devices ( smds ) , a common manufacturing defect on boards with smds 对于表面安装设备来说,焊接开路是一个很普遍的制造缺陷,在线测试设备可以将其测试出来。
For complex boards or boards that aren ' t tested with an in - circuit tester , most companies perform a functional test before final assembly 对于复杂的电路板或者没有经过在线测试的电路板而言,很多公司在最后装配之前进行功能测试。