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数字交流毫伏表的设计 毕业设计（论文）中文摘要
随着电子技术的不断发展，电子仪器的发展也是令人瞩目的。总的来说，电子仪器有两个方向的发展趋势：一是向多功能、多参数、高精度、高速度方面发展，另一个是向实用化、小型化、数字化、廉价的通用或单一用途方面发展。对于数字式电压表来说，一方面趋向于合并于数字式万用表中，另一方面趋向于使用方便、小型廉价的单一用途电压表。本次的毕业设计课题为数字交流毫伏表，其显著特点是测量范围宽，可以实现量程自动转换，操作简单，使用方便。该电压表还具有在—定的测量范围内将量程自动选择在最佳位置的功能，从而可以快速、方便、准确地测量电压，在设计中我采用了模块化的设计方法，先将整机分为不同的功能模块，再设计实现局部功能的单元电路。这样各单元电路的功能明确，之间的界限清楚，便于调试。本文对输入通道的设计、反相放大器的设计、AC／DC转换部分的设计、量程自动转换电路的设计作了详细的介绍。 关键词：数字交流毫伏表 测量 转换
毕业设计（论文）外文摘要
Title: Digital Ac mV the design table The design of digital AC mV meter Abstract: With the continued development of electronic technologies, the development of electronic equipment is also impressive. Overall, there are two directions of the development of electronic equipment trends: First, the multi-purpose, multi-parameter, high-precision, high-speed development and the other to practical technology, miniaturization, digital, single use cheap generic or development. For digital voltage table, on the other hand tend to be combined in a digital micro-meter, on the other hand tend to be user-friendly, small inexpensive single-use voltage table. This graduation project topic for a digital exchange micro-meter, its remarkable characteristic is surveys the scope widely, may realize the measuring range automatic switching, the operation is simple, easy to operate. This voltmeter also has in the survey scope which decides the measuring range automatic selection in the best position function, thus may fast, be convenient, accurately survey the voltage, I has used the modular design method in the design, first putting in order machine will divide into the different function module, the re-engineering realization partial function unit electric circuit. Like this various units electric circuit function is clear about, the between boundary is clear, is advantageous for the debugging. This article to input the channel the design, the inverting amplifier design, AC/DC transforms the partial designs, the measuring range automatic switching electric circuit design has
made the detailed introduction. Keywords : Digital exchange micro-meter measurement conversion
目 录
1．引言···························································6 2. 设计工具的简介·················································7 2.1 主要设计工具的介绍··········································7 2.1.1 PROTEL99简介···········································7 2.1.2 绘制PCB时的注意事项···································7 3. 工作原理·······················································9 3.1一般数字电压表的基本工作原理·································9 3.2 本设计数字电压表的工作原理··································9 3.3 单元电路的原理及设计········································10 3.3.1 输入通道的设计·········································10 3.3.2 反相放大器的设计·······································11 3.3.3 AC/DC转换部分的设计····································12 3.3.4 量程自动转换电路的设计·································14 4. 整机的组装和调试···············································22 4.1 整机的组装··················································22 4.2 调试························································22 4.3 校验························································22 4.4 改进方案····················································23 结论······························································24 心得体会 ·························································24 致谢······························································25 参考文献··························································25 附录A····························································27 附录B····························································29
1 引言
在电量的测量中，电压、电流和频率是最基本的三个被测量。其中，电压量的测量最为经常。而且随着电子技术的发展，更需要测量弱电的电压，所以毫伏电压表就成为一种必不可少的测量仪器。另外，由于数字式仪器具有读数准确方便、精度高、误差小、灵敏度和分辨率高、测量速度快等特点而倍受用户青睐，数字式交流毫伏表就是基于这种需求而发展起来的。
随着电子技术的不断发展，电子仪器的发展也是令人瞩目的。总的来说，电子仪器有两个方向的发展趋势：一是向多功能、多参数、高精度、高速度方面发展，另一个是向实用化、小型化、数字化、廉价的通用或单一用途方面发展。对于数字式电压表来说，一方面趋向于合并于数字式万用表中，另一方面趋向于使用方便、小型廉价的单一用途电压表。
本文所研制的数字式交流毫伏表的显著特点是测量范围宽，可测电压范围为500V以下，最大分辨率为0.01mV，且可以实现量程自动转换，操作简单，使用方便。该电压表还具有在—定的测量范围内将量程自动选择在最佳位置的功能，从而可以快速、方便、准确地测量电压。