This website uses cookies to ensure you have the best experience. Learn more

Electrical Instrumentation And Measurement Essay

1764 words - 8 pages

Pharos University
EE212_ELECTRICAL MEASUREMENT & Interface Prepared By: Dr. Sahar Abd El Moneim Moussa

Dr. Sahar Abd El Moneim Moussa



Dr. Sahar Abd El Moneim Moussa



Measurement involves using an instrument as a physical means of determining a quantity or variable.

A measuring device: a device used for obtaining a value which nearly represents an unknown variable or quantity.

The advancement of science and technology leads to the progress in the measuring techniques.

Dr. Sahar Abd El Moneim Moussa


 Classification

of Measuring Instruments:

1- Mechanical Instruments:

These are the ...view middle of the document...

Which are common for measurements of physical quantities like length, mass and time.
Disadvantages are:

i- limited accuracy due to human factors. Ii- Less accuracy

Dr. Sahar Abd El Moneim Moussa


 Methods

of Measurements: (cont.)

1- Indirect Method: • The unknown quantity under measurement is determined via the use of measurement systems as follows:

Advantages are:

i- High accuracy & sensitivity with lower cost ii- Measurement of non-physical quantities
Dr. Sahar Abd El Moneim Moussa 8

 Basic


1- True Value: At It is the actual value of a variable to be measured 2- Measured Value: Am It is the value measured by a specified instrument 3- Static (Absolute) Error: (A) • It is the difference between measured value (Am ) and true value ( At ). • It is the deviation of the measured value from the true value. A= Am -At
Dr. Sahar Abd El Moneim Moussa 9

 Basic

definitions: (cont.)

4- Static Correction: (C)

It is the correction to be added to the measured value to give the true value
C =-At= At -Am

Dr. Sahar Abd El Moneim Moussa


 Basic

definitions: (cont.)

5- Relative Error: (r)

The Static Error is expressed as a fraction of the full scale deflection or the true value r (as a fraction of true vale) =( Am - At ) / At r (as a fraction of true vale) =( Am - At ) / f.s.d r %(as a fraction of true vale) = (A / At) x 100%

r %(as a fraction of true vale) = (A / f.s.d) x 100%
Dr. Sahar Abd El Moneim Moussa 11

Example 1: A meter reads 127.5 V and the true value of the voltage is 127.43 V, determine the: i- Static error ii- Static correction for this instrument. Solution: The Static Error: A = Am – At = 127.5 – 127.43 = + 0.07 V

Static correction: C = – A = – 0.07 V

Dr. Sahar Abd El Moneim Moussa


Example 2: A voltmeter has a true value of 1.5V. An analog indicating instrument with a scale 0-2.5 shows a voltage of 1.46V. What are the values of absolute error and correction. Express the error as a fraction of the true value and f.s.d. Solution:

It will Solved in the lecture

Dr. Sahar Abd El Moneim Moussa


 Basic

definitions: (cont.)

6- Limiting Error:

It is the specification given to an instrument which guarantees that a full scale deflection will be within a certain percentage of a full-scale reading. However, the readings that are less than full scale has a larger limiting error. Therefore it is the limit of the deviation from the specified value specified by manufacturer

Dr. Sahar Abd El Moneim Moussa


Example 3: A 300 V voltmeter is specified to be accurate within 2% at full scale. Calculate the limiting error when the instrument is used to measure a 120 V source and 60 V. Comment. Solution:  The limiting error at full scale is 2%  The magnitude of the limiting error at full scale is = 300 x ( 2/100 ) = 6 V  The limiting error at 120 V = 6/120 x 100 = 5%  The limiting...

Other Essays Like Electrical Instrumentation and Measurement

Information Technology in Electrical Engineering Essay

705 words - 3 pages including electronics, digital computers, power engineering, telecommunications, control systems, radio-frequency engineering, signal processing, instrumentation, and microelectronics. Early experiments with electricity included primitive batteries and static charges. It has been a subject of scientific interest since at least the early 17th century. The first electrical engineer was probably William Gilbert who designed the versorium: a device that

Second Hand Celestite Processing Equipment Essay

552 words - 3 pages Manufacturers of world class food processing equipment and industrial hand tools.UK. Design and manufacture of on- and off-line quality control and monitoring equipment and complete systems for fibers and yarns. Also, hand held equipment. Technical information on PDF files.Digital and analog thickness gauges, measurement equipment, and custom instrumentation for all your measurement needs. From hand held inexpensive paint thickness gauges to

Challenges of Onlne Surveys

1244 words - 5 pages , Fabio La Foresta and Mario Versaci (2012). International Journal of Measurement Technologies and Instrumentation Engineering (pp. 12-20). Measuring Cognitive Load N. Hogg (2007). Handbook of Research on Electronic Surveys and Measurements (pp. 188-194). An Efficient Method for Motor


2896 words - 12 pages 2.4: Equivalent Circuit Model Use your results to determine a simple circuit model using capacitors and resistors: 2.4.1 Internal losses the mechanical losses of the flywheel are compensated by the electrical power input in the steady state. From your V-I plot of Task 1 determine a circuit model of the mechanical losses using resistors – you will need to consider if this model is linear or over what range

Electrochemical Analysis

1663 words - 7 pages Electrochemical Analysis Introduction: In 1791 Luigi Galvanic discovered electrical activity in the nerves of the frogs that he was dissecting. He thought that electricity was of animal origin and could be found only in living tissues. A few years later, in 1800 Alessandro Volta discovered that electricity could be produced through inorganic means. In fact, by using small sheets of copper and zinc and cloth spacers soaked in an acid solution

Research Methodology

2581 words - 11 pages during the study. Finally, by defining the population, the researcher identifies the group that the results will apply to at the conclusion of the study. In the example in table 2.4, the programmer has identified the population of the study as children ages 10 to 12 years. This narrower population makes the study more manageable in terms of time and resources. Step 6: Develop the Instrumentation Plan The plan for the study is referred to as the

Pandoras Box

4448 words - 18 pages , magnetometers, riometers, a UHF diagnostic radar and optical and infrared spectrometers and cameras which are used to observe the complex natural variations of Alaska's ionosphere as well as to detect artificial effects produced by the IRI. Future plans include completion of the UHF radar to allow measurement of electron densities, electron and ion temperatures, and Doppler velocities in the stimulated region and in the natural ionosphere using

Embedded System and Bio-informatics

2238 words - 9 pages Instrumentation. IRONCLAD means an unassailable/flawless device. It deals with the detection and prevention of hijacking, automatically by combining the features of embedded system and biomedical instrumentation for sensing the parameters. It is based on the sensing of changes in the body conditions of the passengers due to the fear of hijack. Keywords— phonocardiography, ironclad, devastating. I. Introduction The most intimidating part

The Heart And Circulatory System

743 words - 3 pages The Heart and Circulatory System The regular heart beat and pulse is produced by contractions of the heart muscle during the cardiac cycle. These contractions are caused by an electrical stimulus called the cardiac impulse. This natural pacemaker of the heart, called the Sinoatrial node, is located in the Right Atrium. The electrical impulse leaves the Sinoatrial node and travels to the right and left Atria

Freedom Does Not Means License but the Wisdom to Choose What Is Right for Oneself

1609 words - 7 pages of the device cannot be guaranteed, they are not meant to imply that the devices should be operated at these limits. The table of “Recommended Operating Conditions” and “Electrical Characteristics” provides conditions for actual device operation. Note 2: VSS = 0V unless otherwise specified. DC Electrical Characteristics Symbol IDD Parameter Quiescent Device Current VOL LOW Level Output Voltage VDD = 5V VDD = 10V VDD = 15V |IO| < 1.0 µA VDD

Genre History - Experimental/Electronica

2334 words - 10 pages and 2 you can hear the distinct definitions between them. Track 1 is a Trip-Hop track named ‘Bombing Bastards’ released by the artist Terranova. You can hear it to be slower in tempo, atmospheric and with instrumentation. Track 2 is a Ragga-Jungle track named ‘Original Nuttah’ released by UK Apache & Shy FX. You can hear it’s in many ways a fusion of dancehall reggae and techno, the rhythm is hyper-fast and encompasses a low-end bass not

Related Papers

My Career Path As An Electrical Engineer

1265 words - 6 pages measurement, instrumentation, control and protection of electrical equipments and conversion systems. It also involves the study of designing and efficient operation of computers and other applications that are computer based. Now, I will tell you what all options an individual has under electrical engineering which he/she can choose. There are jobs for design, project, research, software and reliability engineers. Other jobs also range from

Industrial Measurement Essay

1278 words - 6 pages manometer over U tube manometer for pressure measurement. Suggest a method for sensing the pressure of water flowing through a pipeline for obtaining the output as an electrical quantity. c. Differentiate between ventury and orifice plate type of flow meters on the basis of pressure recovery, construction, application and cost. d. A capacitive type level sensor is to be used for measuring the level of water (conducting) in a tank. With a neat

Evaluation Essay

1423 words - 6 pages For a process to be adequately controlled and manipulated, the variable of interest in the process (e.g. Temperature, Pressure or Flow) often called the Process Variable (PV) needs to be measured by a sensor which converts the measurement into a suitable signal format (4 – 20mA or digital) and then transmit it to a controller which makes the control decision and finally acts on a final control element in the control loop. What does this signal

"Perception Of The First Year Electronics Engineering Students On The New Program Bs Electronics Engineering.”

1033 words - 5 pages order to become an ECE. Some of these are that following Economics with Taxation & Land Reform, Engineering Economy with Accounting, Environmental and Safety Engineering, Electronic Circuit Analysis and Design, Instrumentation and Measurement, Plane and Spherical Trigonometry, Mechanics of Deformable Bodies, Logic Circuit & Switching Theory, Illumination Engineering Design, Electronic Devices and Circuits, Feedback And Control Systems, Principle of