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Description: 基于MEGA128的多功能仪器,提供以下9种功能：
1. 2路0-10 VDC 电压表
2. 1路0-30V DC 电压表，带有一个10X跳针，可以测试0-300VDC
3. 0 – 3 安电流表
4. 4 通道逻辑分析仪
5. 频率发生器，50%占空比方波，0－5VDC，1HZ到8MHZ.
6. 波形发生器，正弦波、三角波、方波，1HZ 到 20＋MHZ?
7. 频率计
8. +5 VDC ，200 mA 供电输出
9. -5 VDC ， 300 mA 供电输出
-MEGA128 based on the multifunctional equipment to provide the following nine functions : 1. Two Road 0-10 VDC voltage Table 2. A Road 0-30V DC voltage meter, with a 10X jump needles to test 0-300VDC 3. 0-3- 4 ammeter. 4-channel logic analyzer 5. Frequency Generator, 50% duty cycle square 0-6- 5VDC, to 8MHZ 1HZ. 6. waveform generator, sine, triangle wave, square wave, 1HZ MHZ to 20+ 7. Cymometer 8. 5 VDC, 200 9 mA output power. 5 VDC, 300 mA output power
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Size: 513024 |
Author: 许海洋 |
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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: 6144 |
Author: 郭九生 |
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Description: 8051驱动LED的4至20毫安的PWM程序。C环境-LED driver 8051 of 4-20 mA process of PWM. C environment
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Size: 57344 |
Author: 李晨光 |
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Description: 猴子选代王，ＪＡＶＡ源代码，国右是顺20个字真是个麻-Monkeys election on behalf of Wang, JAVA source code, the country is the right word Shun was a 20 Ma
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Size: 11264 |
Author: 归海一萧 |
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Description: January 1988
MM54HC00/MM74HC00
Quad 2-Input NAND Gate
General Description
These NAND gates utilize advanced silicon-gate CMOS
technology to achieve operating speeds similar to LS-TTL
gates with the low power consumption of standard CMOS
integrated circuits. All gates have buffered outputs. All de-
vices have high noise immunity and the ability to drive 10
LS-TTL loads. The 54HC/74HC logic family is functionally
as well as pin-out compatible with the standard 54LS/74LS
logic family. All inputs are protected from damage due to
static discharge by internal diode clamps to VCC and
ground.
Features
Y Typical propagation delay: 8 ns
Y Wide power supply range: 2–6V
Y Low quiescent current: 20 mA maximum (74HC Series)
Y Low input current: 1 mA maximum
Y Fanout of 10 LS-TTL loads-January 1988MM54HC00/MM74HC00Quad 2-Input NAND GateGeneral DescriptionThese NAND gates utilize advanced silicon-gate CMOStechnology to achieve operating speeds similar to LS-TTLgates with the low power consumption of standard CMOSintegrated circuits. All gates have buffered outputs. All de-vices have high noise immunity and the ability to drive 10LS-TTL loads. The 54HC/74HC logic family is functionallyas well as pin-out compatible with the standard 54LS/74LSlogic family. All inputs are protected from damage due tostatic discharge by internal diode clamps to VCC andground. FeaturesY Typical propagation delay: 8 nsY Wide power supply range: 2-6VY Low quiescent current: 20 mA maximum (74HC Series) Y Low input current: 1 mA maximumY Fanout of 10 LS-TTL loads
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Size: 11897856 |
Author: 123wj |
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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: 4~20mA电流环输出式数模转换器AD421的基本接线-4 ~ 20mA current loop output DAC AD421 basic wiring
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Size: 744448 |
Author: 古木 |
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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: AD421 是美国ADI 公司推出的高性能模数转换器,其优良特性使其被广泛应用于各种智能变送器中及其他工
业控制场合中AD421程序，产生4到20MA电流，-AD421 procedures, resulting in 4 to 20mA current
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Size: 4096 |
Author: allen |
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Description: The P2C communicator is intended for remote readout of electricity meters on the level of industrial consumption according to the protocol complying
to the IEC 61107 standard. It enables bi-directional data transmission from a meter to a data processing centre and vice-versa. The communicator
is provided with two communication interfaces - one for the access to the meter, and another for data transmission to the billing centre. The communicator
reads meters via CS interface (20 mA current loop by DIN 66348) or via RS 232 interface. Data are sent to the centre via various communication
media (PSTN, ISDN, GSM or CaTV network). The SEP2W software enables parameter setting and readout of the communicators-The P2C communicator is intended for remote readout of electricity meters on the level of industrial consumption according to the protocol complying
to the IEC 61107 standard. It enables bi-directional data transmission from a meter to a data processing centre and vice-versa. The communicator
is provided with two communication interfaces- one for the access to the meter, and another for data transmission to the billing centre. The communicator
reads meters via CS interface (20 mA current loop by DIN 66348) or via RS 232 interface. Data are sent to the centre via various communication
media (PSTN, ISDN, GSM or CaTV network). The SEP2W software enables parameter setting and readout of the communicators
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Size: 133120 |
Author: ruggero |
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Description: MSP430与AD5422的通讯程序，实现高精度4——20mA电流输出。-MSP430 with the AD5422' s communication procedures to achieve high-precision 4- 20mA current output.
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Size: 30720 |
Author: fyp0303 |
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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: ：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: Field bus is the name of a family of industrial computer network protocols used for real-time distributed control, now standardized as IEC 61158.A Field bus is a digital, bidirectional, multi-drop, serial-bus communication network.Replaces the existing 4-20 mA analog signal standard.It specifies the way to connect instruments in a manufacturing plant.It works on a network structure which typically allows daisychain, star, ring, branch, and tree network topologies.
It links the PLCs to the components which actually do the work such as sensors, actuators, electric motors, console lights, switches, valves, and contactors.
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Size: 765952 |
Author: Arun |
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Description: The HART Application Guide has been created by the HART
Communication Foundation (HCF) to provide users of HART products
with the information necessary to obtain the full benefits of HART digital
instrumentation. The HART communication protocol is an open standard
owned by the more than 100 member companies in the HCF. Products that
use the HART protocol to provide both analog 4–20 mA and digital signals
provide flexibility not available with any other communication technology.
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Size: 1045504 |
Author: swetika |
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Description: The HART Application Guide has been created by the HART
Communication Foundation (HCF) to provide users of HART products
with the information necessary to obtain the full benefits of HART digital
instrumentation. The HART communication protocol is an open standard
owned by the more than 100 member companies in the HCF. Products that
use the HART protocol to provide both analog 4–20 mA and digital signals
provide flexibility not available with any other communication technology.
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Size: 31744 |
Author: swetika |
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Description: 在实际应用中，很多时候需要输出电压、电流等信号，特别是在工控行业中，4-20MA的转换经常要用到，选用AD421芯片来做的话，成本颇高，如果采用单片的PWM输出来做DA完全可以做到14位以上的精度。-In practical application, and many times need to signal of the output voltage, electric current and so on, especially in the industrial control industry, 4-20 ma transformation often want to use, choose AD421 chip to do it, cost is high, if USES the single chip PWM output to the accuracy of the DA can do more than 14.
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Size: 112640 |
Author: pa |
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Description: 工控，电力，仪表中常常使用4-20mA的信号输出，低成本高精度设计-Is often used in industrial control, electric power, the instrument of 4-20 ma signal output, low cost and high precision design
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Size: 112640 |
Author: 卢广帅 |
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Description: Fully Isolated, Single Channel Voltage and 4 mA to 20 mA Output with HART Connectivity
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Size: 1674240 |
Author: ali |
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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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