甚至现代的方法(用这种方法扫描时，被测人员要在一块玻璃板上转动手指)，往往需要对每根指头采集多次，才能获得一个可用的指纹。
Even the modern approach, in which the subject's finger is rolled over a glass plate for scanning, often requires several attempts per finger to get a usable print.
为了完成这项测试，你需要将一个金属板放置到被测电路的上面。
To perform this test, you need a fixture that positions a metal plate over the circuit under test.
前端采集插头接收测试数据，切换继电器电路传递被测电路板信号。
Testing data is received with data acquisition plug, signal from tested circuit board is transferred by circuit of switch relay.
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