非接觸式明渠污水流量計的研制

本文根據(jù)系統(tǒng)的技術要求，主要提出了系統(tǒng)硬件結構設計方案并論述設計原理。詳細的論述了信號采集電路、LCD顯示電路，4～20mA 標準電流輸出電路、打印機電路、鍵盤電路和RS-232 接口電路的設計思想。采用了一些抗干擾措施，提高了系統(tǒng)的工作穩(wěn)定性和測量精度。
關鍵字：系統(tǒng)硬件結構；模塊功能；抗干擾措施。
Abstracts: The design plan of system’s hardware structure is mainly put forward according to technical requirements of the system and its design principle is discussed. The idea of signal sample circuit , LCD display circuit, standard current output circuit from 4mA to 20mA, printer circuit, keyboard circuit and RS-232 interface circuit is stated in detail. Running stability and measurement precision of the system are raised by adopting some of anti-interference methods.
Keywords: System’ hardware structure; Module function; Anti-interference methods.