Current and Voltage Measurement on Mobile Device

Electronic Voltage and Current Transformers Testing Device

A method for testing electronic instrument transformers is described, including electronic voltage and current transformers (EVTs, ECTs) with both analog and digital outputs. A testing device prototype is developed. It is based on digital signal processing of the signals that are measured at the secondary outputs of the tested transformer and the reference transformer when the same excitation s...

Measurement of Harmonic Voltage, Current, and Power at Industrial Frequency

Supply Voltage Compensation of Hot Wire Flow Measurement Device

Supply voltage compensation is important to keep the accuracy for hot wire/hot film gas flow sensors. A compensation experiment device is established, the two steps curve fitting is presented to determine the functional relations among flow、sensor output and supply voltage, the coefficient of fitting polynomial is determined by Least Square method, thus eliminating the influence of supply volta...

Current Trends in Research on Mobile Phones in Language Learning

This study aimed at examining the major mobile wireless technologies, that is,mobile phones and the possibilities associated with them, currently in use in theeducational domains, with an emphasis on language teaching and learning practices.Accordingly, some of the most typical studies using different functions of mobilephones such as e-mail, multimedia capabilities, Wireless Application Protoc...

Near minimum-time direct voltage control algorithms for wheeled mobile robots with current and voltage constraints

Near minimum-time direct voltage control (DVC) algorithms synthesizing path-planning and path-following are proposed for wheeled mobile robots (WMRs) satisfying (i) initial and final postures and velocities as well as (ii) voltage and current constraints. To overcome nonholonomic and nonlinear properties of WMRs, we divide our control algorithm for cornering motion into three sections: TSD (Tra...