英语翻译现在要翻译一小段英语,由急用,12.5.7 Functional TestingA functional board tester simulates inputs to the board and output loading the board is expected to drive,then measures outputs to determine proper overall functional opera

英语翻译现在要翻译一小段英语,由急用,12.5.7 Functional TestingA functional board tester simulates inputs to the board and output loading the board is expected to drive,then measures outputs to determine proper overall functional opera
英语翻译
现在要翻译一小段英语,由急用,
12.5.7 Functional Testing
A functional board tester simulates inputs to the board and output loading the board is expected to drive,
then measures outputs to determine proper overall functional operation of the UUT.It has the broadest
fault coverage,since it is intended to test all operating modes of the board.As an example,a functional
tester for an automotive engine control module may provide simulated inputs such as throttle position,
oil pressure,engine rpm,vehicle speed,water temperature,and manifold absolute pressure (MAP).It
will provide output loads for electronic fuel injectors and the ignition system.It then powers up the
board,changes the simulated inputs,and determines if the outputs respond properly.It can also test for
the ability to drive outputs at each end of their specification range.For example,if it is expected that the
fuel injectors may have impedances ranging from 100 to 125
Ω
,the tester can test for proper output at
each of those load impedances.
A properly programmed functional tester can provide rapid go/no-go information about the UUT
and will have a typical fault coverage of about 85 to 98%.That is,when properly set up and programmed,
a functional tester should perform a complete checkout of a product and allow very few faults to pass
undetected.However,it has poor abilities for supporting fault diagnosis and rework.While it will detect,
when properly programmed,most or all faults an assembled UUT might display,it will rarely be able to
identify faults at the component level.This in one reason other types of testers,particularly ICA and
ICT,precede functional test.
The functional tester typically requires long setup and software generation times,even when automatic
generation software is included.This time is typically measured in months,and a functional tester for a
complex UUT may require 4 to 8 months of development time,as well as costing a lot of money.
12.5.8 Substitution Testing
For certain types of systems consisting of several circuit boards,substitution testing may be a cost-effective
test technique.As an example of this test technique,consider a laptop computer consisting of three
boards,along with the display,keyboard,and mouse.The three boards may be the main board,the
peripheral (display,keyboard,and mouse) driver,and the modem board.To use substitution testing on
the peripheral board,all other components of the laptop system are present,including internal display,
external monitor,and internal and external keyboards.The finished production board is plugged into
this system,and all affected operating aspects of the laptop are verified,such as external monitor drive
and internal display drive.

英语翻译现在要翻译一小段英语,由急用,12.5.7 Functional TestingA functional board tester simulates inputs to the board and output loading the board is expected to drive,then measures outputs to determine proper overall functional opera
12.5.7功能测试
一个功能板测试仪模拟的投入,向董事会和输出负载董事会预计径
这些措施的产出,以确定适当的整体功能运作的uut .它具有广泛的
故障范围,因为它是为了测试所有运营模式的董事会.作为一个例子,一个功能
测试仪汽车发动机控制模块,可提供模拟的投入,如节气门位置,
机油压力,发动机转速,车速等,水温,以及多方面的绝对压力（图） .它
将提供输出负载为电子喷油器和点火系统.然后权力了
局,改变了模拟投入,并作出决定,如果产出应对得当.它也可以考验
能力,以驱动输出,在每个年底,其规范的范围.举例来说,如果我们预计这
喷油器可能有阻抗不等,从100到125
ω
,该测试仪可以测试妥善输出
每一个这些负载阻抗.
一个完善的程控功能测试仪可以提供快速走/没有去了解uut
并有典型的故障覆盖率约85至98 ％ .也就是说,当妥善设立和编程,
一个功能测试要履行好一个完整的退房的一个产品,并允许极少数断层通过
未被发现.然而,它的能力差,为支持故障诊断和返工.同时,它会发现,
当适当的编程,大部分或全部故障集合uut可能释放,它会很少能
查明故障在组件水平.这其中一个原因,其他类型的测试,尤其是国际合作社联盟
信息和通信技术,先于功能测试.
功能测试通常需要长期的设置和软件生成的时代,即使自动
代的软件,是包括在内.这个时间通常是衡量个月,另功能测试仪为
复杂uut可能需要4至8个月的开发时间,以及耗资了很多钱.
12.5.8替代测试
对于某些类型的系统构成的几个电路板,替代测试可能是一个具有成本效益的
测试技术.作为一个例子,这种测试技术,考虑一部手提电脑,其中3个
板,随着显示器,键盘和鼠标.三国议会可能成为主要的局,
外设（显示器,键盘,鼠标）驱动程序和调制解调器局.使用替代经测试
周边董事会外,所有其他组成部分的笔记本电脑系统都在场,包括内部展示,
外部监管和内部和外部键盘.成品生产板插入
这个制度,所有受影响的经营方面,笔记本电脑验证,如外部监督径
和内部显示驱动.