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Description: 本文给出了一种利用软件实现4～20mA传感器数据转换的方法，消除了硬件电路中电压放大器输出端的残留电压，保证了数据转换精度-this paper, the use of software to achieve a 4-20mA sensor data conversion methods Elimination of hardware circuit voltage amplifier output voltage of the residue, ensuring the accuracy of data conversion
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Size: 6425 |
Author: 郭九生 |
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Description: 基于c8051f330芯片开发的电机正反转控制系统，能同时完成参数的设定与显示，系统具有4~20mA的标准模拟信号输出-c8051f330 chip development based on the reversion motor control system parameters can be completed simultaneously with the creation shows that the system has a 4-20mA analog signal output standards
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Size: 38912 |
Author: 肖业伟 |
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Description: IDC3516-4-20mA电流环隔离接口芯片的应用-IDC3516-4-20mA current loop isolation Application Interface Chip
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Size: 33792 |
Author: gw |
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Description: 显字数显表源程序，拿来就可以用，采集4~20MA电流，-significant source of wordage a table, can be taken out, collecting 4-20MA current,
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Size: 126976 |
Author: 何宏 |
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Description: 模拟网上超市购物结算功能
1．用户可以添加购买一种商品，添加的信息包括商品名称、数量和单价
2．用户可以删除已购买的一种商品
3．用户可以查询已购买的一种商品的详细信息，查询时要指明查询的商品的记录号是多少
（商品记录号是按照商品购买次序编的），还可以指定查询第一个或最后一个购买的商品信息。
4．用户可以删除所有已添加到购物车的商品
5．用户可以打印要购买的商品的清单
6．用户可以清空显示信息的窗口
7．用户可以要求结帐，系统会打印出用户购物清单，并给出总价。
-err
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Size: 17408 |
Author: 小吴 |
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Description: ——学生信息系统的设计与实现——
以学生信息为背景，设计与实现一个小型学生信息系统，具体如下：
1、采用双向链表方式存储学生信息，每个链表节点存储一个学生的信息，包括学号、姓名、性别、年龄、专业、班级等（所有学生姓名设置为英文）；
2、采用图形界面显示方式，实现学生信息的列表显示，并可以按照学号、姓名两种方式顺序列表显示所有学生的信息，如果学生信息较多，具备分页显示功能；
3、采用图形界面交互方式，实现根据学生学号、姓名分别查找，也可以按照上述两个关键词实现“与”关系和“或”关系的关键词关联查找；
4、所有信息输入界面，可以实现自动屏蔽非法输入和不合理输入（比如年龄值为3000等），用户界面既友好又鲁棒；
5、不采用Java类库中的链表类，而是自定义和实现链表结构，并能将链表中的学生信息存储在一个自定义格式的文件中。-err
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Size: 49152 |
Author: |
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Description: (1) 315、433、868、915Mh的ISM 和SRD频段
(2) 最高工作速率500kbps，支持2-FSK、GFSK和MSK调制方式
(3) 高灵敏度（1.2kbps下-110dDm，1％数据包误码率）
(4) 内置硬件CRC 检错和点对多点通信地址控制
(5) 较低的电流消耗（RX中，15.6mA，2.4kbps,433MHz）
(6) 可编程控制的输出功率，对所有的支持频率可达+10dBm
(7) 支持低功率电磁波激活功能
(8) 支持传输前自动清理信道访问（CCA），即载波侦听系统
(9) 快速频率变动合成器带来的合适的频率跳跃系统
(10) 模块可软件设地址，软件编程非常方便
(11) 标准DIP间距接口，便于嵌入式应用
(12) 单独的64字节RX和TX数据FIFO-(1) 315,433,868,915 Mh of the ISM and SRD frequency bands (2) maximum rate of 500kbps, support for 2-FSK, GFSK and MSK modulation (3) high sensitivity (1.2kbps under-110dDm, 1 packet error bit-rate) (4) built-in hardware CRC error detection and control of point-to-multipoint communication address (5) a lower current consumption (RX in, 15.6mA, 2.4kbps, 433MHz) (6) programmable control of output power for all the support frequencies up to+ 10dBm (7) to support low-power electromagnetic wave activation (8) to support the transmission before the automatic clean-up Channel Access (CCA), namely Carrier Sense System (9) Fast frequency synthesizer brought about by changes in suitable frequency hopping system (10) modules can be software-based address, software programming is easy (11) standard DIP spacing interfaces for embedded applications (12) separate 64-byte RX and TX data FIFO
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Size: 319488 |
Author: 李华力 |
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Description: 4-20MA信号发生器，含电路图，使用说明以及汇编源程序-4-20MA signal generator, including schematics, source code for use as well as the compilation
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Size: 389120 |
Author: 李和明 |
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Description: PWM经过RC滤波产生电压,经过XTR115产生4-20mA电流输出,要点是XTR115的电压输入问题,自身为两线制,+5V输出提供不了较大电流,需要用DCDC,RC滤波采用钽电容和4.7k-4.9k的低温漂电阻能得到较高线形度,PWM输出为AVR单片机16位,模式15,不分频-PWM voltage generated through RC filter, after XTR115 have 4-20mA current output, the key points of the voltage input XTR115 problems, their own two-wire system,+ 5V output can provide a larger current, need to DCDC, RC filter using tantalum capacitors and 4.7k-4.9k resistor at low temperature drift can be a higher degree of linear, PWM output for the AVR Singlechip 16, mode 15, regardless of the frequency
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Size: 4096 |
Author: niucunfei |
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Description: 在这次设计中，主要是实现工业标准上的电压（0～5V、1～5V）和工业标准上的电流（0～10mA、4～20mA）的互相转换。-In this design, mainly on the achievement of industry-standard voltage (0 ~ 5V, 1 ~ 5V) and the current industry standard (0 ~ 10mA, 4 ~ 20mA) mutual conversion.
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Size: 207872 |
Author: 秦川 |
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Description: 单芯片，单电源，直接4-20ma电流转换为，轨到轨0-5V电压输出-Single-chip, single power supply, 4-20ma direct current converter for rail-to-rail voltage output 0-5V
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Size: 101376 |
Author: jianghua |
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Description: 使用 SN8P1702A 的低成本上下限通用数字表头
图示电路是一款输入电压 DC200mV ,满度读数 2000 个字的数字电压表头电路.分辨力达到 100uV/字 .这种参数与通常使用的 3 位半数字表头相吻合,(但是这里没有负电压信号的测量功能).因此,可以方便地在无需负信号输入的场合替换原来的数字表头.
替换带来的好处是这里具有上下限设置的控制功能,而普通的 3 位半数字表头却只能测量显示而不能进行设置控制.
配原理图应用和连接说明:
图A:测量和控制直流 200mA 信号.如果是交流信号,需要先有 AC-DC 转换.
图B:测量和控制直流 200mV 信号.如果是交流信号,需要先有 AC-DC 转换
图C:测量和控制直流 4～20mA 信号.这种信号可以远传,例如压力传感器的输出.输入配置的 -50mV 电压是在输入 4mA 的时候,恰好抵消取样电阻上的压降而设.实际中需要使用低内阻的恒压源.
图D:测量和控制温度测量信号.LM35D 具有 10mV/℃ 的输出,因此,通过 10:1 的分压,达到 1mV/℃,100℃ 就是 100mV,100mV 就显示 1000 个字,把小数点定位在十位上,就是 100.0℃
附有 AD 转换部分的源程序-Use SN8P1702A low-cost universal digital meter on the lower
Icon is a circuit input voltage DC200mV, full-scale reading of 2000 characters digital voltage meter circuit. Resolution to 100uV/word. This argument often used three and a half number of the header match, (but there is no negative voltage signal measurement function). Thus, it can easily without a negative signal input the number of occasions replace the original header.
The benefits are here to replace a set of control functions on the lower limit, while the ordinary three half-meter can only measure the number of display and control can not be set.
Schematic connection with the application and instructions:
Figure A: 200mA DC measurement and control signals. If the AC signal, you need to have AC-DC conversion.
Figure B: 200mV dc measurement and control signals. If the AC signal, you need to have AC-DC converter
Figure C: measurement and control of DC 4 ~ 20mA signal. This signal can be remote, such as pressure s
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Size: 163840 |
Author: 蓝天 |
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Description: TINA下绘制的 工业4-20mA 传感器信号采集用的隔离放大器。能将4-20mA的电流信号转换为0~3V的电压信号，方便设备采样。-TINA drawn under the Industrial 4-20mA sensor signal acquisition using isolation amplifiers. Can 4-20mA current signal into a 0 ~ 3V voltage signal to facilitate the sampling equipment.
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Size: 2048 |
Author: 刘若西 |
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Description: 4-20ma application note
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Size: 55296 |
Author: LVNT |
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Description: 模拟量万能输入，信号可以是，Ⅱ型标准信号：0~5V、0~10MA，Ⅲ型标准信号：1~5V、4~20MA，mV电压信号：0~20mV、0~100mV，热电阻： Pt100、Cu50，热电偶： B、E、J、K、S、T
-Universal analog input signal can be, Ⅱ type standard signal: 0 ~ 5V, 0 ~ 10MA, Ⅲ Standard signals: 1 ~ 5V, 4 ~ 20MA, mV voltage signal: 0 ~ 20mV, 0 ~ 100mV, thermal resistance: Pt100, Cu50, Thermocouple: B, E, J, K, S, T
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Size: 66560 |
Author: shj |
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Description: ：热电阻在工业生产中常用于中低温区测温，是温度测量中应用较为普遍的测温元件．通过对其测
温原理的研究，设计了基于MSP430FI69单片机的热电阻测温仪．本设计采用恒流源驱动三线制热电
阻，配合信号平移、放大电路，利用片内A／D转换器，通过分时采样将热电阻对应的电压信号采集进来．
经过一阶插值拟合运算程序处理后显示温度值并由D／A转换器输出电压信号，再经过V-1变换实现
4—20 mA变送输出功能．-: Thermal resistance often used in industrial production in the low temperature zone temperature, the temperature measurement of more general use of temperature measurement devices. Through its temperature measurement principles of research, design microcontroller based MSP430FI69 thermal resistance thermometer. The design uses a constant current source driver RTD three-wire system, with the signal translation, amplification circuit, the use of on-chip A/D converter, sampling the thermal resistance through the time-corresponding voltage signal acquisition came. After fitting a first-order interpolation processing operation program displays the temperature value by D/A converter output voltage signal, and then transform through the V-1 4-20 mA transmitter output.
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Size: 148480 |
Author: nnnn |
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Description: 4-20ma电流转化成1-5V电压电路仿真-4-20ma current is converted into 1-5V voltage circuit simulation
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Size: 10240 |
Author: wenzhengfa |
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Description: 单片机PWM转4－20ma电流输出控制方法-Microcontroller PWM turn 4-20ma current output control method
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Size: 84992 |
Author: 李鹏 |
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Description: 将单片机PWM信号变送成工业标准电流输出4-20mA -The microcontroller PWM signal transmission into industry standard 4-20mA current output
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Size: 1627136 |
Author: 李鹏 |
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Description: 可测量和处理来自 2 线、3 线和 4 线电阻式温度检测器的温度信号输入，并输出与来自 RTD 输入的所处理的温度相对应的 4 至 20 mA 电流回路信号，并进行系统级的校准以提高 ADC 和 DAC 精度。(It can measure and process the temperature signal input from the 2-wire, 3-wire and 4-wire resistive temperature detector, and output the 4-20 mA current loop signal corresponding to the temperature processed from the RTD input, and carry out system-level calibration to improve the accuracy of ADC and DAC.)
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Size: 6524928 |
Author: fenggeweiwu |
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