CAJ | 학술논문

针对传统数字电压表结构复杂、成本高、寿命短和不便升级等问题，提出来一种基于C语言以P89V51单片机为控制核心的数字电压表，硬件电路采用正负双积分型A/D转换器；电源电路用稳压芯片LM7805和LM7905来处理，电压负荷在+5 V和-5 V电压之间；数字信号处理采用CD4052B，由LM324构成量程自动转换电路。控制功能用C语言编程实现。测量范围：10 mV-2 V,分辨率1 mV(2 V档)；测量误差小于±0.5 V；输入电阻大于1 MΩ。实验结果表明，该电压表能够抑制工频干扰且测量精度高，具有自动校零、量程自动切换功能和便于自动升级等优点。
침대전통수자전압표결구복잡、성본고、수명단화불편승급등문제，제출래일충기우C어언이P89V51단편궤위공제핵심적수자전압표，경건전로채용정부쌍적분형A/D전환기；전원전로용은압심편LM7805화LM7905래처리，전압부하재+5 V화-5 V전압지간；수자신호처리채용CD4052B，유LM324구성량정자동전환전로。공제공능용C어언편정실현。측량범위：10 mV-2 V,분변솔1 mV(2 V당)；측량오차소우±0.5 V；수입전조대우1 MΩ。실험결과표명，해전압표능구억제공빈간우차측량정도고，구유자동교령、량정자동절환공능화편우자동승급등우점。
Aiming at the shortcomings of traditional digital voltage meter such as complex structure, high cost, short service life and difficult upgrade, a digital voltage meter is proposed, which is based on C language and uses P89V51 single chip microcomputer as control core. The hardware circuit uses dual integrating A/D converter;the power supply circuit is handled by steady voltage chip LM7805 and LM7905;the voltage load ranges from+5 V to-5 V;the digital signal processing adopts CD4052B, and the automatic range conversion circuit is constituted by LM324. The control function is implemented by C language programming. The measurement range is from 10 mV to 2 V, the resolution ratio is 1 mV (2V gear);the measurement error is less than ±0.5 V;the input resistance is greater than 1 MΩ. The experimental results show that the voltage meter can restrain the power interference, has high measurement accuracy and such advantages as automatic zero, automatic range switching and automatic upgrade.