088基于单片机的频率计及电压表的设计(附源程序+图纸)-无忧助学网 关键词 频率计、电压表、单片机、量程自动切换、移位寄存器 [gap=551]Keywords Frequency counting、Voltage table、Single chip microcomputer、
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前置放大电路设计了量程自动切换的电阻反馈式两级放大。
A range automatic transfer is designed for the preamplification system with resistance feedback.
本系统具有从低真空到高真空，气压测量范围宽、量程自动切换功能，并能实现对真空度的实时控制。
The system's measuring range can be automatically switched from low vacuum to high vacuum, and it has a wide measuring range.
这样可以实现仪器量程的自动切换。
This can realize the automatic change to switch over instrument amount.
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