摘要
电能表作为用电量的测量工具广泛的应用于各种场合。在电能表校表系统中,需要的最基本的输入信号源是高精度双路正弦信号源,并要求可对其频率、相位、幅值进行调节,来对电能表进行校准。
基于单片机的程控信号源设计，运用数字调相、数字调幅和数字调频等技术，要求实现相位、幅度、频率的高精度程控调节。本文设计了一种利用锁相环频率合成技术和数字波形合成技术组成的程控低频正弦波信号发生器，并给出了调幅、调频、调相的实用电路，频率调节通过改变8253计数器的分频系数来实现；相位调节由51单片机预置计数器的计数初值来完成，幅度的调整通过改变DAC1210II的参考电压来实现，使频率分辨率达0.01Hz,相位调节精度达0.1°，并介绍电路中的主要芯的功能及使用。输出正弦波频率和幅值的精度高，稳定性好，失真度低，电路简单、可靠、便于程控。
关键词：数字合成信号源；程控；调幅；调频；移相；
Abstract
Meter consumption as the size of the measurement tool is widely used in various occasions. In single-phase power meter verify system, the most basic needs of the input signal is the source of two-way high-precision sine signal source, and may request its frequency, phase, amplitude in a certain step to adjust to the imitate of the actual electricity load with a right meter calibration.
Design of the programmable signal supply controlled source，which based on the MCU，including digital phase adjustment，distal amplitude adjustment，digital frequency adjustment etc．The system should achieve high quality digital adjustment of phase, amplitude and frequency. This paper describes the use of a PLL frequency synthesizer technology, and digital wave form synthesis technology consisting of program-controlled low-frequency sine wave signal issued devices, and applies the amplitude， frequency， phase of practical circuit. Frequency can be adjusted through a change in the 8253 counter-frequ (2010-06-05, C/C++, 373KB, 下载32次)
摘要
温度测量仪表是工业生产中常用的一种测量装置。对于配用热电偶的二次测温仪表,传统的检定方法是采用逐盘转动电位差计进行平衡读数, 然后查热电偶分度表求出误差,检定过程比较复杂。为了简化检定操作,方便现场检定,我们设计了新型的适用于mV 型测温仪表的检定仪。该检定仪利用AT89C51单片机, 将各种常用热电偶分度表固化在检定仪的EPROM 中,将毫伏发生器、调节器、显示器等组成一体, 具有操作简便、读数准确、功能强、重量轻、体积小等优点, 操作人员不必再查找热电偶分度表。该检定仪设有电势正负转换开关, 为具有零位补偿的测温仪表的零位检定与修理提供了方便，通过不同的按键，该仪表可以选择不同的热电偶分度号，进行校零和进入不同的工作状态。所以该型检定仪是一种非常适宜于现场使用的仪器。
关键词：检定仪；单片机；热电偶；线性化
Abstract
The temperature meter is one of the commonly used measuring devices in the industrial production. The traditional calibration method for going with the thermocouple’s temperature meter is looking up the thermocouple indexing table to extract the error after a balance reading through the plate rotation potentiometer. Obviously, the process of calibrating is too complex. In order to simplify the operations of the calibration and make the scene calibration more convenient, we have designed a new calibrator which is suitable for the mV temperature meter’s calibration. Such calibrator uses a AT89C51 single-chip computer to solidify each kind of commonly used thermocouple indexing table in the calibrator s EPROM, then the millivolt generator, the regulator, the monitor and so on will compose a body, which has the advantage of simple operation, accurate reading, strong function, light weight, small volume and so on. And the operators do not need to look up the thermocouple indexing (2010-06-05, C/C++, 218KB, 下载32次)
用stm32实现的温度采集，使用芯片内部热敏电阻
Stm32 achieved using temperature acquisition, use chip thermistor (2015-08-13, C/C++, 3926KB, 下载29次)
可以用来参考RRN8302B校表设计，基于51系列单片机，可参考使用
Can be used for reference RRN8302B calibration design,Based on 51 series MCU, it can be used for reference. (2019-07-24, C/C++, 74KB, 下载28次)
包含了RN8209的数据手册，电路设计及校表算法的公式计算表格
Contains the RN8209 data sheet, circuit design and calibration algorithm formula calculation table (2019-05-09, C/C++, 20408KB, 下载28次)
STM32控制8位4.63寸TFT屏，带触摸画图程序，带校屏，带各种字体的显示功能。
STM32 control eight 4.63 inch TFT screen, touch the paint program, with a screen, with the function of the various font display. (2015-12-06, C/C++, 4450KB, 下载26次)
本程序对初学者非常好的1602校时数字时钟
School for beginners in 1602 when the digital clock (2010-05-24, C/C++, 16KB, 下载23次)
用51单片机做的多功能电子钟，有时间、日历、温度显示，4*4键盘校时，闹钟功能
Microcontroller to do with the 51 multi-function digital clock, time, calendar, temperature display, 4* 4 keyboard school, alarm clock function (2011-09-24, C/C++, 3103KB, 下载22次)
通过这次上机考试（2004年4月）以及从各大论坛上考生朋友们所抽取的上机题来看，所有的上机考试题全来自南开100题，但网上所流传的以及正式书本上的解法也有不少的错误，因此也误导了一些基础不深的朋友们，为此我将2004年版南开100题中所有的题都在无忧2004年上半年版模拟系统中进行了测试（无忧模拟系统也安装了最新的补丁），将正确的、精华的解法采纳出来，其中有许多题也加入了我的编程思想，尽量照顾了一些基础不深并对C语言中指针解法很畏惧的朋友们，做到容易理解及容易掌握
through this examination on the plane (in April 2004) and from the major candidates forum friends, taken on the plane that we can see that all examinations and that the plane, all from Nankai 100 title, but the spread of the Internet and books on the formal solution has many mistakes, and therefore mislead the deep foundation friends, I will this 2004 version of Nankai 100 that all of the worries that in the first half of 2004 edition simulation system for testing (no worries simulation system also install the latest patches), to correct, the essence of the solution adopted, in which there are many that have joined the program, I thought, tried to take some deep foundation as well as C language Pointer Solution very afraid of friends, so easy to understand and easy to master (2006-04-02, C/C++, 206KB, 下载22次)
C51 时钟源代码,四位显示,用PC机校时,时间显示精度高.
C51 clock source code, 4, PC-school, the time displayed high accuracy. (2006-02-25, C/C++, 2KB, 下载20次)
帮人家做的单片机毕业设计——温度控制加热系统。三个18B20温度采集，并且PWM控制加热。并有EEPROM记录需要加热到的温度，1302时钟。1302时钟采用串口校时。
- Temperature control of heating systems to help others to do the single-chip graduate design. Three 18B20 temperature acquisition, and PWM control heating. And EEPROM records need to be heated to a temperature of 1302 clock. 1302 clock serial school. (2012-06-12, C/C++, 76KB, 下载20次)
ATT7022b correction table 校表程序源码，C语言编程
ATT7022b correction table (2012-03-13, C/C++, 5KB, 下载19次)
一种精确时钟同步协议的最佳主时钟算法，实现网络的高度精确校时
An accurate clock synchronization protocol best master clock algorithm, to achieve highly accurate timing network (2011-09-23, C/C++, 387KB, 下载18次)
数值分析全部课程设计,有了这让你的数值分析实验报告无忧.
Numerical analysis of a full course of design, with the numerical analysis of this so you lab report worries. (2010-06-30, C/C++, 722KB, 下载18次)
介绍一种利用卫星接收机接收的时间信号, 经单片机接收处理后进行自动校时的
数显时钟的设计
Introduction of a satellite receiver to receive time signal processing by the MCU after receiving automatic error correction design digital display clock (2010-06-16, C/C++, 131KB, 下载17次)
HDLC链路层协议的CRC校验.HDLC使用16位CRC校校验。使用的多项式是：x16+x12+x5+x0 已通过测试。
The CRC of the HDLC link layer protocol. HDLC 16 CRC school checksum. The polynomial used is: by testing x16+x12+x5+x0. (2012-07-16, C/C++, 1KB, 下载16次)
北京大学计算机网络讲义（上），相信你可以领略到名校的风采，感受名师的教诲！
Computer network lecture from peking university (2009-06-24, C/C++, 6168KB, 下载16次)
这是我在学校做电子钟留下的资料
希望能给你带来帮助
This is my electronic bell in the school do hope that they will be left behind by the information to help you (2008-10-12, C/C++, 4KB, 下载16次)
包含了一些单片机的综合运用 有LCD1602的时钟日历 单片机唱歌 07年全国电子大赛的跷跷板小车 看门狗程序 我现在是在校生一直在努力的提高自己 非常希望能成为贵站的会员。
Contains a number of single-chip microcomputer has the comprehensive use of single-chip LCD1602 clock calendar in 2007 to sing the national electronic competition watchdog procedures seesaw car I am now in school has been working very much hope that the improvement of their own to become a member of贵站. (2009-07-13, C/C++, 8KB, 下载15次)
用Adams三步四步法求解微分方程，程序主要是微分方程的Adams三步和四步外插法还有四阶预校算法的源程序。
Adams four with three-step solution of differential equations, differential equations are the main procedures of Adams and three-step outside the four-step interpolation method was also fourth-order pre-school algorithm source code. (2009-03-01, C/C++, 2KB, 下载14次)