Development of a Multi-Function Virtual Instrument Based on a Constant Current Source

2013 ◽  
Vol 385-386 ◽  
pp. 492-495
Author(s):  
Dong Bing Dai ◽  
Ya Jun Wang ◽  
Ye Ping Sun ◽  
Zheng Guang Liu
Keyword(s):  
Data Acquisition ◽  
High Precision ◽  
High Power ◽  
Virtual Instrument ◽  
Current Source ◽  
High Accuracy ◽  
Constant Current ◽  
Constant Current Source ◽  
Data Acquisition Card ◽  
Further Development

Virtual instrument is a result of the computer combined with some instrument hardware, working for the instrumentation applications, it is one trend of the instrumentation development .This paper presents a design of a high-power and high-precision constant current source, studied three different electrical testing technologies based on constant current source and propose the principle of integrated the three electrical test technologies on a virtual instrument platform. A multi-function virtual instrument system based on LabView language, USB data acquisition card and a constant current source has been developed. This system has a high accuracy, high integration and a thecapability of further development etc..

Design of sampling resistor of high power constant-current source

2012 ◽  
Vol 24 (4) ◽  
pp. 925-928
Author(s):  
赵娟 Zhao Juan ◽  
李波 Li Bo ◽  
于治国 Yu Zhiguo ◽  
曹宁翔 Cao Ningxiang ◽  
黄雷 Huang Lei ◽  
...  
Keyword(s):  
High Power ◽  
Current Source ◽  
Constant Current ◽  
Constant Current Source

Weak Signal Detection and Application in Electronic Experiment Based on Virtual Instrument

2014 ◽  
Vol 511-512 ◽  
pp. 294-300
Author(s):  
Tian Tian ◽  
Zhen Yu Li ◽  
Tian Gao ◽  
Fang Yao Liu ◽  
Jian Wu
Keyword(s):  
Virtual Instrument ◽  
Current Source ◽  
Teaching Experiment ◽  
Open Loop ◽  
Low Noise ◽  
Constant Current ◽  
Weak Current ◽  
Experimental Conditions ◽  
Printing Plate ◽  
Constant Current Source

Base on the virtual instrument technology, a micro signal measurement system was established and applied to the electronic teaching experiment. It is composed of PC, oscilloscope, signal generator, ac constant current source, low noise preamplifier and tested operational amplifier, etc. it can complete the measurement of uV weak voltage, uA weak current measure, wires and printing plate conductor resistance and inductance, amplifier open-loop amplitude frequency and phase frequency characteristics, and so on many aspects of modern electronic measurement experiment content. The system not only has the characteristics of functional diversity, measurement accuracy, and good graphic interface, simple operation and overcomes the shortcomings in the course of electronic technology experiment teaching, and play an important role on improving the experimental conditions,reducing the cost of experiments, raising the level of classroom teaching and practice of teaching.

The Design of High-Precision Temperature Measurement System Based on C8051F350 and PT100

2013 ◽  
Vol 423-426 ◽  
pp. 2559-2562 ◽  
Author(s):  
Long Liu ◽  
Yun Cui Zhang ◽  
Shen Hua ◽  
Jun Xiao ◽  
Li Jia Huang
Keyword(s):  
Temperature Measurement ◽  
High Precision ◽  
Measurement System ◽  
Current Source ◽  
Constant Current ◽  
Constant Current Source ◽  
Interface Circuit ◽  
Software Algorithms ◽  
Precision Temperature ◽  
Temperature Measurement System

This article describes the design of High-Precision Temperature Measurement System based on C8051F350 and PT100. The system consists of the control circuit, temperature sensors, signal amplification circuit, field bus interface circuit. The system adopts constant current source method and a differential measurement circuit. A 24-bit A/D built in the CPU is used to sample the data and Non-linear compensation by software algorithms for it. The design improves the accuracy of the temperature measurement system.

Temperature Measurement and Control of Fiber Drawing Furnace Based on Virtual Instrument

2012 ◽  
Vol 529 ◽  
pp. 507-511
Author(s):  
Lei Chen ◽  
Zhong Dong Wang
Keyword(s):  
Temperature Measurement ◽  
Virtual Instrument ◽  
Current Source ◽  
Constant Current ◽  
Instrumentation Amplifier ◽  
Fiber Drawing ◽  
Constant Current Source ◽  
And Control ◽  
Measurement And Control ◽  
Conditioning Circuit

The temperature in fiber drawing is one of the key factors influencing fiber’s performance. To the temperature measurement and control problem, the four-wire lead configuration of Pt100 with current excitation was adopted, the signal conditioning circuit includes constant current source, instrumentation amplifier and anti-aliasing filter. The computer collected signals from the conditioning circuit and output control signals by data acquisition card PCI-6221M. The software program was based on LabVIEW, the function relationship between resistance and temperature based on international thermometric scale and the digital filter were applied to calculate temperature. The improved PID control algorithm and the PWM technique were used to realize the temperature control. The experiment results show that the deviation is 0.71°C when the average temperature of the furnace center is 170.25 °C, which satisfies the design requirements.

scholarly journals Development of Virtual Resistance Meters using LabVIEW

2018 ◽  
Vol 8 (1) ◽  
pp. 133 ◽  
Author(s):  
Suman Lata ◽  
H. K. Verma ◽  
Puja Kumari
Keyword(s):  
Data Acquisition ◽  
Virtual Instrument ◽  
Current Source ◽  
Excitation Source ◽  
Voltage Source ◽  
Dc Voltage ◽  
Labview Software ◽  
Final Measurement ◽  
Data Acquisition Card ◽  
Dc Current

This paper presents the development of three virtual resistance meters using LabVIEW. The unknown resistance is measured in terms of a known resistance of high accuracy by employing (a) a real dc voltage source, (b) a real dc current source, and (c) a virtual dc voltage source. In each case, ratio of two voltage signals is acquired by a single-ADC based multichannel data acquisition card. Therefore error of the ADC gets cancelled, when ratio of two voltages is used in the final calculation of the value of unknown resistance. The first two VRMs use a real excitation source and are thus semi-virtual instruments, whereas the third one is fully-virtual as the excitation source is also implemented in the LabVIEW software along with DAC section of the data acquisition card. The three virtual resistance meters have been successfully implemented. The principle of ratio-metric measurement used makes the accuracy (uncertainty) of final measurement free from the uncertainties of the ADC, the DAC and the excitation source. Standard deviations of the readings taken with the three VRMs have been evaluated and compared. It is concluded that the fully-virtual instrument has the lowest and excellent value of standard deviation.

Design method for high power and low noise intelligent adjustable constant current source

2018 ◽  
Vol 33 (9) ◽  
pp. 778-786
Author(s):  
季志博 JI Zhi-bo ◽  
王辉 WANG hui ◽  
王磊 WANG lei ◽  
董兴法 DONG Xin-fa ◽  
王军 WANG Jun
Keyword(s):  
High Power ◽  
Design Method ◽  
Current Source ◽  
Low Noise ◽  
Constant Current ◽  
Constant Current Source

The Design of Data Acquisition System in Wireless Dynamic Strain Acquisition Technology

2014 ◽  
Vol 607 ◽  
pp. 673-676 ◽  
Author(s):  
Chen Ding ◽  
Ya Wen Dai ◽  
Peng Li ◽  
Yang Sun ◽  
Wei Zheng Wang ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Current Source ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Constant Current ◽  
Dynamic Strain ◽  
Accurate Data ◽  
Constant Current Source ◽  
Signal Amplifier ◽  
Source Signal

Dynamic strain acquisition technology is becoming increasingly important in industrial production. Compared with the static strain acquisition technology,the dynamic stain acquisition technology provided a much wider range of frequencies from 0~100KHz which required a much more accurate data acquisition system. This paper proposed an accurate data acquisition system which included electric bridge、constant current source、signal amplifier and anti-aliasing filter. This system has largely suppressed noise and increased the performance of the dynamic strain acquisition.

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