A microprocessor-based intelligent multifunction instrument (original) (raw)

VERSATILE MULTIFUNCTION ELECTRICAL DIGITAL METER BASED ON PERSONAL COMPUTER

mit.bme.hu

The objective of this work is to describe a versatile multifunction electrical digital m eter based on personal computer; it has been developed for incorporation into a laboratory testing system. The meter uses two 12-bit A/D. The A/Ds are connected to parallel printer port of PC. The work was developed for Measurement of power. Using a programming language Turbo C++ was calculated: rmsVolts, rmsAmps, volt-amps, Reactive Power, Phase angle, frequency, Active power, watts-hour, resistance, capacitance and period. The values are shown at the monitor as a 4-digit display. The accuracy of meter is within 0.1%. The virtual power meter has a virtual two-channel oscilloscope. The meter was developed to senses power supply of electronic devices. (TV, PC) and electromagnetic device.

A Review of Electrical and Electronics Measuring Devices

2019

This paper describes different measuring devices used in electrical system. A measuring instrument is a device in which we can determine the magnitude or value of the quantity to be measured. The electrical quantity such as voltage, current, power, power factor, energy and electronic quantity such as resistance, capacitance, inductance are measured with the help of different measuring devices. These papers introduce different measuring instruments with their working principal.

Design and Development of a Microcontroller Based Digital Wattmeter (MIDIWAT).

This paper presents a design to produce a microcontroller based digital wattmeter that measures the magnitude of power consumption of various loads (electronic devices) connected through it. To measure the power consumption under a sine wave signal (AC supply), the root mean square (rms) of both voltage and current is multiplied. The design is implemented using the techniques of digital signal processing and transformation. By this approach, both voltage and current are sampled a number of times during a cycle, the rms of the signals, real power, apparent power and the power factor are computed on the discrete signals. Finally, the magnitude of the power consumption is computed by integrating the power usage over a period of time. Product of this effort is a MIDIWAT that can measure rms voltage and current and power consumption over a period of time up to 1 kVA of loads (± 2%) with an overload protection

A NOVEL APPROACH TO INTEGRATE MEASURING INSTRUMENTS ONTO SINGLE SoC

In this paper a novel proposal of SoC (Systemon-Chip) design approach is presented for the measurement, analysis, storage and display of physical and electrical quantities. The proposed System will be interfaced with sensors to perform the function of transducers. The LCD screen provides the display of both analog and digital data. At the circuit design level, transmission gates are used along with bulk-Silicon, through which the system occupies 80% less area and offers 60% more performance with very high rate of accuracy. This is an integrated form of all measuring instruments, Analyzers and recorders etc. The size of the system is so compact that it is comparable to the size of palm top computers or cell phones and operates with low power and high speed.

Design and Hardware Implementation of an Universal Meter

Design and hardware implementation of an universal meter has been presented in this paper. Current sensing shunt resistor, IC LTC1050, arduino nano(ATMEGA328) and a 20x4 LCD display are the major building blocks of the design. The real power, reactive power, apparent power, frequency and energy information conveyed by the output signal from LTC1050 is extracted by necessary calibration process and finally displayed to LCD display using microcontroller coding. Obtained results show fair amount of accuracy which validates my circuit design and proves precise hardware implementation.

INSTRUMENTATION AND MEASUREMENT IN ELECTRICAL ENGINEERING

The inclusion of an electrical measurement course in the undergraduate curriculum of electrical engineering is important in forming the technical and scientific knowledge of future electrical engineers. This book explains the basic measurement techniques, instruments, and methods used in everyday practice. It covers in detail both analogue and digital instruments, measurements errors and uncertainty, instrument transformers, bridges, amplifiers, oscilloscopes, data acquisition, sensors, instrument controls and measurement systems. The reader will learn how to apply the most appropriate measurement method and instrument for a particular application, and how to assemble the measurement system from physical quantity to the digital data in a computer. The book is primarily intended to cover all necessary topics of instrumentation and measurement for students of electrical engineering, but can also serve as a reference for engineers and practitioners to expand or refresh their knowledge in this field. IX ACKNOWLEDGMENTS I would like to thank Ivica Kunšt, dipl. ing for his suggestions and for designing most of the figures in this book. I also wish to thank my colleagues at the Faculty, as well as my colleagues from the TEMUS-158599 project "Creation of the Third Cycle of Studies -Doctoral Studies in Metrology" for their support. Special thanks go to my mother Marija, father Vladimir, and my brother Krešimir for their encouragement and assistance. And finally, thanks to my wife Božica and to my kids for their patience and support.

New concepts in systems for electrical measurement

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1963

A new concept is presented of more flexible instrumentation for power systems. A group of individual transducers is used for measuring the usual electric quantities and temperatures, each producing a high-level d-c output suitable for either analog or digital readout. Conventional d-c mechanisms are used in the end devices, eliminating the need for more complex mechanisms

Intelligent System for Capacitance Measurements

Capacitive sensors are widely used in various products like players, mobile phones and other portable devices. Since they are small, robust and flexible, more and more the technology is utilized in further application fields such as household appliances as well as automotive and industrial applications. This article describes the construction, function and capabilities of an intelligent system for capacitance measurements. Both hardware and software solutions are considered and presented. A suitable connection approach to a LabVIEW equipment, measurement automation and experimental results are shown. Keywords – Capacitive sensors, Intelligent system, LabVIEW, Virtual Instrument.

An Automated System for the Calibration of High Accuracy Multifunction Instruments

This Paper gives a summary of a completely automated system that was developed for the high accuracy calibration of multifunction measuring instruments (like the Fluke 5720A calibrator or HP3458A multimeter, for example). The system is capable of calibrating all the functions (ranges: Vdc: 10 mV ... 1 kV; Vac: 2 mV ... 1 kV; Idc: 10 µA ... 2 A; Iac: 10 µA ... 2 A) of digital calibrators and multimeters at very high accuracy. Additionally, efficiency and facility of operation are characterizing the system, which became a powerful tool in electrical metrology.