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Fabrication of automatic switch for AC-DC completely automated measurement system at NIS
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作者 M Helmy A Raouf Rasha S M Ali 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2017年第1期27-31,共5页
A fast automatic AC-DC switch is designed and fabricated mainly by a microcontroller and three double poles single throw reed relays.This new switch is introduced to establish a fully automated system for AC-DC measur... A fast automatic AC-DC switch is designed and fabricated mainly by a microcontroller and three double poles single throw reed relays.This new switch is introduced to establish a fully automated system for AC-DC measurements through ACDC transfer standards for the first time at the National Institute for standards(N IS)in Egypt.The implemented circuit of theautomatic AC-DC switch and its protection are presented in details.An AC voltage source is calibrated against DC voltagesource by using the demonstrated automatic switch as an application The calibrated voltage ranges are2V,6V,20V and60V as examples.The uncertainty budget is also evaluated for the calibrated values. 展开更多
关键词 ac voltage measurement ac-DC transfer standard automatic switching system UNCERTAINTY
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Establishment of Automated Multi-Range Multipliers Combined with TVC
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作者 Rasha S.M.Ali M.Helmy A.Raouf 《Journal of Measurement Science and Instrumentation》 CAS 2011年第3期297-299,共3页
An automated multi-range multipliers(range resistors)system is established for the AC voltage measurements by using a thermal voltage converter.It is performed automatically by selecting the appropriate multiplier w... An automated multi-range multipliers(range resistors)system is established for the AC voltage measurements by using a thermal voltage converter.It is performed automatically by selecting the appropriate multiplier whose voltage range contains the voltage to be measured without changing it manually through a new designed system.It consists of control part through a micro-controller controlled by specified prepared Lab-VIEW program and switching part through electronic relays in one circuit as clearly described in this work.It is used for measuring the ac voltage in the range from 1 V to 200 V.Also,it can be used for the voltage ranges up to 1 000 V by putting some factors into consideration.The AC-DC transfer differences for these multipliers combined with thermal voltage converter are determined automatically against another standard thermal voltage converter by using another Lab-VIEW program. 展开更多
关键词 ac voltage measurement thermal voltage converter ac-DC transfer standard MULTIPLIERS uncertainty
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An analysis in metal barcode label design for reference
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作者 Yin ZHAO Hong-guang XU Qin-yu ZHANG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第2期173-184,共12页
We employ nondestructive evaluation involving AC field measurement in detecting and identifying metal barcode labels,providing a reference for design.Using the magnetic scalar potential boundary condition at notches i... We employ nondestructive evaluation involving AC field measurement in detecting and identifying metal barcode labels,providing a reference for design.Using the magnetic scalar potential boundary condition at notches in thin-skin field theory and 2D Fourier transform,we introduce an analytical model for the magnetic scalar potential induced by the interaction of a high-frequency inducer with a metal barcode label containing multiple narrow saw-cut notches,and then calculate the magnetic field in the free space above the metal barcode label.With the simulations of the magnetic field,qualitative analysis is given for the effects on detecting and identifying metal barcode labels,which are caused by metal material,notch characteristics,exciting inducer properties,and other factors that can be used in metal barcode label design as reference.Simulation results are in good accordance with experiment results. 展开更多
关键词 Metal barcode label Signal detection ac field measurement Internet of things
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