A synchronous sampling system for high precision AC measurements

2008 ◽  
Author(s):  
F. Overney ◽  
B. Jeanneret ◽  
A. Mortara
Keyword(s):  
High Precision ◽  
Sampling System ◽  
Synchronous Sampling

scholarly journals Atmospheric Fossil Fuel CO2 Measurement Using a Field Unit in a Central European City During the Winter of 2008/09

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 835-845 ◽  
Author(s):  
M Molnár ◽  
L Haszpra ◽  
É Svingor ◽  
I Major ◽  
I Svetlik
Keyword(s):  
High Precision ◽  
Fossil Fuel ◽  
Rural Site ◽  
Mixing Ratio ◽  
European City ◽  
Sampling System ◽  
Central European ◽  
Mixing Ratios ◽  
Clean Air ◽  
Field Unit

A high-precision atmospheric CO2 monitoring station was developed as a field unit. Within this, an integrating CO2 sampling system was applied to collect samples for radiocarbon measurements. One sampler was installed in the second largest city of Hungary (Debrecen station) and 2 independent 14CO2 sampling lines were installed ∼300 km from Debrecen in a rural site at Hegyhátsál station as independent background references, where high-precision atmospheric CO2 mixing ratios have been measured since 1994. Fossil fuel CO2 content in the air of the large Hungarian city of Debrecen was determined during the winter of 2008 using both the measurements of CO2 mixing ratio and 14C content of air. Fossil fuel CO2 was significantly enhanced at Debrecen relative to the clean-air site at Hegyhátsál.

A Synchronous Sampling System of On-Line Monitoring for Long-Distance Cable Insulation Based on DSP and GPS

2014 ◽  
Vol 981 ◽  
pp. 653-656
Author(s):  
Xin Lao Wei ◽  
Bo Zhu ◽  
Bing Pang ◽  
Tong Liu ◽  
Song Wang ◽  
...  
Keyword(s):  
Monitoring System ◽  
Global Positioning System ◽  
Power Cable ◽  
Induced Voltage ◽  
Sampling System ◽  
Long Distance ◽  
Cable Insulation ◽  
Synchronous Sampling ◽  
Global Positioning ◽  
On Line

The induced voltage of the long-distance power cable will reach high value, so the metallic sheath of cable should be cross-linked to reduce the induced voltage. It is safe and economic enough but bring out problem of monitoring the situation of insulation. In order to solve the problem, a new method is provied and a monitoring system based on Digital Siganl Processor and Global Positioning System are designed. The composition of system has been introduced, includes the hardware and software design. The results show that the monitoring system can reflect the situation of cable insulation, and the mothod is proved to be validity and feasibility.

scholarly journals The new analytical expression for measurement uncertainty in a measuring of RMS value of AC signals as result of non ideal synchronization

2006 ◽  
Vol 3 (1) ◽  
pp. 33-43
Author(s):  
Predrag Petrovic
Keyword(s):  
Computer Simulation ◽  
Measurement Uncertainty ◽  
Root Mean Square ◽  
Fundamental Frequency ◽  
High Precision ◽  
Mathematical Expression ◽  
Mean Square ◽  
Precision Instrument ◽  
Synchronous Sampling ◽  
Measurement Uncertainties

Synchronous sampling allows alternating current (AC) quantities, such as the root mean square (RMS) values of voltage and power, to be determined with very low uncertainties (on the order of a few parts of 10-6 [1]). In this a new mathematical expression for estimating measurement uncertainties in non ideal synchronization with fundamental frequency AC signals is presented. The obtained results were compared with those obtained with a high-precision instrument for measuring basic AC values. Computer simulation demonstrating the effectiveness of these new expression, are also presented.

Design and Realization of Resolution Detection System for AD7730

2012 ◽  
Vol 241-244 ◽  
pp. 190-193
Author(s):  
Xiao Ming Chang ◽  
Bin Sun ◽  
Shi Xuan Yao
Keyword(s):  
Instrument Development ◽  
High Precision ◽  
Virtual Instrument ◽  
Detection System ◽  
Performance Parameter ◽  
Analog Signal ◽  
Sampling System ◽  
Development Environment ◽  
Signal Sampling ◽  
Application System

Before using high-precision ADC AD7730 in analog signal sampling system, it’s required to measure the actual resolution if needed. This paper introduces the design of resolution detection system for ADC, which is used to evaluate the resolution performance parameter of ADC. First, a framework of the application system is designed, and specified at the example of 24bit ADC AD7730 application based on the Virtual Instrument Development Environment LabVIEW. Finally, actual resolutions of input channels are given and evaluated.

High-Speed Brushless DC Motor Current-Loop Sampling System Design for Three-Axis Turntable

2014 ◽  
Vol 527 ◽  
pp. 252-258
Author(s):  
Guan Da Liu ◽  
Bo Mo ◽  
De Zhi Zhou ◽  
Shu Cen Du
Keyword(s):  
High Speed ◽  
Dc Motor ◽  
Vital Role ◽  
Regulation System ◽  
Brushless Dc Motor ◽  
Current Loop ◽  
Signal Acquisition ◽  
Sampling System ◽  
Synchronous Sampling ◽  
Brushless Dc

Brushless DC motor (BLDCM) is adopted in the driving of a three-axis turntable. A high-speed current sampling system plays a vital role in intelligent control. This article firstly describes the working principle of a triple-closed-loop regulation system and emphatically dissects the characteristic of the current-loop among speed-loop and position-loop. Secondly, a signal acquisition-alignment circuit of three phases’ current and voltage is designed. Based on ADS8365, a scheme of high-speed current loop’s precise and synchronous sampling system is provided. Finally, experimental results have proved the validity and practicality of the scheme applied in the control of three-axis turntable.

A New Kind of Smart Dual DSP2812 Power Quality Monitor Based on Dedicated Users

2014 ◽  
Vol 1008-1009 ◽  
pp. 701-708
Author(s):  
Le Feng Cheng ◽  
Tao Yu
Keyword(s):  
Power Quality ◽  
High Precision ◽  
Low Cost ◽  
Measurement Data ◽  
Electric Energy ◽  
High Capacity ◽  
Quality Measurement ◽  
Digital Signal ◽  
Smart Meter ◽  
Synchronous Sampling

Focus on the increasingly prominent problems of power quality of dedicated users, study on solving electric energy problems, especially for harmonic pollution, was essential. This paper to study the method of testing and calculating electric energy index, then designed hardware to monitor and analyze power quality measurement data. The hardware was developed base on dual DSP2812, which was very advanced digital signal processing chip, and the hardware utilized high precision instantaneous synchronous sampling chip MAX1324, extended RAM and FLASH, RS232 communication circuit, high capacity SD card storage circuit, etc. The dual DSP power quality smart meter was tested and applied in dedicated users and its reliability, practicability, availability and accuracy was authenticated. This smart meter also has advantages of easy to carry, low cost, high precision, easy to promote, etc. can effectively meet power quality management of dedicated users.

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