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EH4系統(tǒng)的前置放大器接口在實(shí)際操作中容易出現(xiàn)故障,而且前置放大器不具備自檢功能,給故障排除帶來了很大的困難,為此以PIC16C57單片機(jī)和LM339電壓比較器為核心設(shè)計(jì)了前置放大器的檢測(cè)電路,通過軟硬件的配合來實(shí)現(xiàn)實(shí)時(shí)操作時(shí)出現(xiàn)的故障排除,利用廣泛應(yīng)用的USB接口與前置放大器相連接可以方便地使用該檢測(cè)系統(tǒng)。實(shí)踐證明該系統(tǒng)可以及時(shí)、方便地檢測(cè)出各個(gè)接口的狀態(tài),同時(shí)具有體積小、便于攜帶,運(yùn)行速度快等特點(diǎn)。
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USB 2.0 Specification Engineering Change Notice (ECN) #1: Mini-B connector Date: 10/20/2000 Reason for ECN: The USB 2.0 specified device-side connector – the B connector – is too large for use with a new generation of handheld and mobile devices, e.g., cell phones which would benefit from connectivity to the PC. This ECN incorporates a specification of a device-side mini connector (hereafter r