Mcq on measuring instruments 1 how engineering works. Download various measuring instruments pdf latest instruments. If all outputs are in the same proportion to corresponding inputs over a span of values, then input output plot is straight line else it will be non linear see diagram below for continuous control applications, the problems arise due to the changes in the rate the output differs from the instrument. The measurement, instrumentation and sensors handbook kelm. Linear measurement in engineering survey, the linear horizontal distance is to be measured to complete a survey. These suggested steps will help any food plant set up a program so they can rest easy knowing that their measuring devices are reading correctly. Calibration is essential to improving a companys bottom line, by minimizing risk to product defects and recalls, and enhancing a reputation for consistent quality.
Signal conditioning modifies the transducer signal into a desired form e. However, some physical laws were derived based on measurement results, such as the biotsavart law, when in 1820, the french scientists jean. Design, manufacturing and testing of gauges of all kinds. This list may not reflect recent changes learn more. Methods of measurement based on agreed units and standards. I would define a measuring instrument as any device that can be used to determine the value of one or more physical parameters. Some commonly used face standard angular measuring devices are.
All the static performance characteristics are obtained by one form or another of a process called calibration. Softcloth measuring tapes and hard yardsticks quantify everything from fabric lengths for sewing and craft projects to board lengths to make those adirondack chairs you always wanted for the patio. These encoders are widely used in a variety of measuring instruments as the length measuring system that can. Classification of measuring instruments circuit globe. You will be assessed against the following units of competency. The ammeter, voltmeter, wattmeter are the examples of the electrical measuring instrument.
This unit passes its self test but has not been tested further. The instrument instrument is the general term that researchers use for a measurement device survey, test, questionnaire, etc. Tesa length measuring equipment with inductive probes tesa offers a complete family of value sensors electronic probes as well as dedicated measuring instruments for the most demanding applications. Our offered product such as dimensional measuring instruments, ndt testing instruments, hygrometer supplier, lux meters supplier, magnetic v block supplier, depth micrometer supplier, feeler gauge supplier. Electronic instruments for measuring basic parameters. Measurement instruments for assessing the performance of. Instrumentation and measurement in electrical engineering. Angle measuring instruments i universal bevel protractor 1 it is an angular measuring instrument capable of measuring angles to within 5 min 2 the name universal refers to the capacity of the instrument to be adaptable to a great variety of work con gurations and angular interrelations. As the name suggests, voltmeter is a measuring instrument which measures the voltage across any two points of an electric circuit. Instrumentation books free download links programmable logic design instrumentation basics engineeringdefinitions measurement of control basics a heat transfer textbook 8.
Jan 11, 2016 basic electrical measuring instruments 1. Computeroperated, remotecontrol power quality instruments handheld power quality instruments, smaller, less expensive power quality instruments portable power quality instruments, traditional, highly accurate power quality instruments. To the user of measuring instruments a knowledge of their construction. Instruments rarely respond instantaneously to changes in the measured variables due to such things as mass, thermal capacitance, fluid capacitance or electrical capacitance. Anglemeasuring instruments a schematic illustration of a bevel protractor for measuring angles. This would include both scalar and vector quantities. Output state provides an indication of the value of the measurement readout device or recording.
Pdf instruments measuring the diseasespecific quality of. Linear measuring instruments free download as powerpoint presentation. When the variables of interest are time dependent and timebased information is need. Today, the usual measuring instruments for time are clocks and watches. An introduction to the basic principles of instrument calibration.
Classification of digital measuring instruments springerlink. Wikimedia commons has media related to measuring instruments. Pdf the measuring instrument accuracy class as a measure of the. Units of measurement and their standards, which is concerned with the establishment, reproduction, conservation and transfer of units of measurement and their standards. Sales tax is not separately calculated and collected in connection with items ordered from measuring instruments through the site unless explicitly indicated as such in the ordering process. There are a few measuring instruments that are more commonly seen than others. Encyclopedia of medical devices and instrumentation new york.
Jul 07, 2017 the selection of an appropriate measuring instrument for a particular application also depends on four factors, they are. The measuring instruments are used frequently in our daytoday life for the measurement of various quantities like length, weight, temperature, pressure, current, voltage etc. Batteries, operating instructions, manufacturers test certificate. Fundamentalsofinstrumentationandmeasurement yidnekachew. Face standard angular measuring devices include angle gauges and sine bars. Instrument, validity, reliability research rundowns. Instrument accuracy checks and calibration quality. You can choose with confidence, knowing that every dranetzbmi instrument meets iso9001 quality standards.
The the pointer will deflect upscale for one half cycle of the input waveform and downscale for the next half cycle. It is basic instrument of measurement, consist of two types of scale. Mcq on electrical devices mcq on measuring instruments. Property of a measuring instrument, whereby its metrological properties remain constant over time. This is a basic measuring instruments bmi 4800 powerscope. A diameter is the straight distance across a round object. Classification of measuring instruments electrical instruments may be divided into two categories, that are. The size and type of parts to be measured, the environment temperature, humidity, dust, pressure, and so. The classification of the electric instruments depends on the methods of representing the output reading. The selection of measuring instruments is a complex task, which depend on the size, the character and the value of measured magnitude. Mar 09, 2016 introduction to mechanical measurement 1.
An instrument is a device in which we can determine the magnitude or value of the quantity to be measured. Rulers are used extensively in design labs and classrooms, while meter and yardsticks are more commonly used for. The laboratory shall also ensure that it has the staff resources needed. Each measuring instrument serves a specific purpose for the person who is using it. More concentration should on class room work and text book methodology. These instruments gives the magnitude of quantity under. The measuring instruments are the most important part of the measuring process so their selection have to be done carefully. Unit 6 angular measuring devices angular measuring devices. We can classify the basic measuring instruments into the following two types. Pressure force area p f a or the units of measurement are either in pounds per square inch psi in. A calibration program is necessary to ensure that the instruments and devices used to measure key processing or product parameters are accurate. Basis of measuring equipment suitability in quality control. Types of precision measuring instruments used in industry.
Items ordered from measuring instruments may be subject to tax in certain states, based on the state to which the order is shipped. The instruments, whose deflections are proportional to the current or voltage under measurement are used for dc measurements only. The following 200 pages are in this category, out of approximately 387 total. Generally instruments are classified in to two categories. The measurement of this linear horizontal distance between two points on the earth surface is known as linear measurement. Unit 5 linear measuring devices and linear measuring devices. Fundamentals of instrumentation and measurementedited by dominique placko. There are a few measuring instruments that are more commonly seen than.
Measuring instruments navigation products glossary of terms measuring instruments videos explore pce instruments wide selection of monitoring, analysis, testing and measuring instruments used to measure various parameters in the physical, electrical and chemical spectra. The measuring quantity can be voltage, current, power and energy etc. The devise that is used for measurement of certain physical quantity is called as measuring instrument. Measurement is an important part of science, construction, art, design and a wide array of other professional fields. Before starting any electrical or electronics device installations or studying electrical practical, we should know about the measurements and its measuring instruments. You have learnt in this unit that some basic instrumentation in. In the past, a common time measuring instrument was the sundial. A list of examples of measuring instruments could include but wou. These instruments are most widely used in engineering practice because they are simple and inexpensive.
Classification of electrical instruments electrical tutorials. Absolute instruments absolute instruments or primary instruments. That is why the best measuring instruments are necessary. An instrument is said to be linear if the input physical quantity and the resulting output. The vernier caliper is only one of many types of calipers. Read the recognition kit instructions for verifiers and weighbridge operators pdf and ensure you have practical experience that allows you to generate evidence related to test reports and transaction records. But before proceeding further, it good to refresh the definitions and terms used in measurements, instruments. It is used to measure linear dimensions like length, diameter, depth. The most suitable instrument for measuring current at high frequency is a moving coil instrument. Measurement and control basics, 3rd edition thomas a. In electronic instruments, the resolution may be affected by analog output stage resolution and scaling. Rulers are used to measure length, as are meter sticks and yardsticks.
Let us discuss about these two basic measuring instruments briefly. Classification of measuring instruments electrical. Electronic measurements and instrumentation pdf notes. Classification of measuring instruments the instrument used for measuring the physical and electrical quantities is known as the measuring instrument.
Cooper, modern electronic instrumentation and measurement techniques prentice hall, 1994. The purpose of this course is to introduce you to precision measuring tools. Measuring instruments lecture measuring instrument equipment. In this course you will learn about decimals and tolerances as well as how to use the following tools. Instrumentation books download instrumentation tools. Precision measuring instruments od 1401 lesson 1task 1 calipers calipers are used to measure pointtopoint distances, such as diameters. Exact measurement is an absolute must for everyone who wants to guarantee precise and firstclass work. A test in which known values of the input are applied to a measurement system or sensor for the purpose of observing the system or sensor output.
Chapter 1 mechanical measurement presentation prepared by prof. In this post we will discuss about classification of electrical instruments. Jul 07, 2017 i would define a measuring instrument as any device that can be used to determine the value of one or more physical parameters. The selection of an appropriate measuring instrument for a particular application also depends on four factors, they are. Precision obtained in such instruments is more than the precision obtained in line standard angular measuring devices. Cengunderstandingaccuracyspecificationstechnicalnoteb211482ena. The electronic measurements and instrumentation notes pdf emi pdf notes book starts with the topics covering performance characteristics, ramp type, staircase ramp, wheat stone bridge, block schematic of cro, dual trace, strain gauges, flow measurement, flow measurement, etc. The basic entity needed to develop the knowledge is called data, and it is. If such an instrument is connected in an ac circuit. The examination of the design principles of digital instruments only with. A classification schematic of digital instruments fig. Below are some examples of how the instruments themselves change our measurements. The same basic diameter with a class 1 fit ranges from a zero.
Both measuring transducers umt 550 and umt 540 measure basic. Import data and price of portable measuring instrument under. Stop watches are also used to measure time in some sports. The classification of measuring instruments according to their accuracy is to be effected by drawing up classes characterizing different levels of accuracy for instruments of the same category. Instruments measuring the diseasespecific quality of life of family carers of people with neurodegenerative diseases. Twelveinch scale sixinch dial caliper outside micrometer 01 inch ball gauges once you complete a topic, a skill check is available for. Both signal generation signal generators, power supplies and signal measurement multimeters, scopes instruments are nonideal. For highly accurate measurement of time an atomic clock is used.
Basic electrical measuring instruments by pramod a 2. These instruments converts the energy of the measured quantity directly into energy that actuates the instrument and the value of the unknown quantity is measured or displayed or recorded directly. The output signals are standard signal and can then be processed by other equipment to provide indication, alarms or automatic control. Here, i am describing the major concepts of electrical measuring instruments in detail. Apparatus devices that operate at the voltages below, and might cause electrical shock. Electronics and electrical measuring instruments and their. Be able to perform simple electrical measurements of voltage, current, and resistance, as well as more sophisticated, scientific electrical measurements, master handheld and more accurate stationary multimeters and understand their differences, have some knowledge of use of ac signals, ac generators, and an oscilloscope. The third edition of measurement and control basics is a thorough and com. Classification of measuring instruments precision instrument ability to measure within the accuracy of 0. General characteristics and selection of measuring instruments. With a need to make quality products which meet design specified tolerances, a large number of firms, research and development centers, and school and college laboratories use measuring instruments that. The units of voltage are volt and the measuring instrument is meter.
The purpose of this paper is to analyze the existing methods for selection of. The magnitude of one of the quantity is unknown, and it is compared with the predefined value. Pdf on jun 18, 2010, bayo o eludoyin and others published introduction to. Center for effective school practices rutgers university. Understanding measurement performance and specifications. The size and type of parts to be measured, the environment temperature, humidity, dust, pressure, and so on. This category has the following 47 subcategories, out of 47 total. There are several advantages of traditional electromechanical instruments. Electronic devices for signal sampling and quantification. Calibration basics and best practices individuals who view calibration as a necessary evil are not taking into account the bigger picture. The three most common variations in the measured quantity.
The term measurement means the comparison between the two quantities of the same unit. Scope this recommendation applies to length measuring instruments hereinafter called instruments. We also use calipers to compare sizes with standards such as a graduated rule. Basic principles of instrument calibration learning.
This basic knowledge will help you throughout your electrical and electronics engineering. View detailed import data, price, monthly trends, major importing countries, major ports of portable measuring instrument under hs code 9031. To help distinguish between instrument and instrumentation, consider that the instrument is the device and instrumentation is the course of action the process of developing, testing, and using the device. The measurements are done with respect to two faces of the measuring instruments. Jul 20, 2014 electrical measuring instruments definitions, types. The main article for this category is measuring instruments. Instrumentation is the art of measuring the value of some plant parameter, pressure, flow, level or temperature to name a few and supplying a signal that is proportional to the measured parameter. Download various measuring instruments pdf for ias, cds, nda, ssc cgl, ssc cpo, bpsc, uppsc, and other competitive exams. Simple measuring instruments national measurement institute. Understand instrument calibration terms calibration range, instrument range, zero and span adjustments, five point calibration, field calibration, inshop or bench calibration, bench tester, calibrators, calibration records, as found data, as left data. The static characteristics of an instrument are, in general, considered for instruments which are used to measure an unvarying process condition. Classification, absolute and secondary instruments, indicating instruments.
True rms responding voltmeter, electronic multimeter, digital. Pressure is actually the measurement of force acting on area of surface. This unit is a 4channel line disturbance analyzer and digital graphing monitor. Our standard probes also known as halfbridge probes operate according to the electrical principle. Linearity expresses the deviation of the actual reading from a straight line.
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