The measuring instruments are the most important part of. Karim abawi training in sexual and reproductive health research geneva 20 geneva workshop 20. The vernier caliper is only one of many types of calipers. List of length, distance, or range measuring devices wikipedia. Calibrating measuring instruments reference gages and. Classification of electrical instruments electrical tutorials. For small internal diameter, and groove width measurement. The instruments used for measuring the angles and types of plain limit gauges. Each measuring instrument serves a specific purpose for the person who is using it. Many forms of float type instruments are available, but each uses the principle of a buoyant element that floats on the surface of. Some meter movements can be used for both ac or dc measurements, but in general, each meter movement is best suited for a particular type. Linear measurements of precision instruments the precision instruments are following to possess high degree of accuracy in measuring the dimensions. Types of applications of measurement instrumentation.
Design, manufacturing and testing of gauges of all kinds. Types of measuring instruments dynamic strain measuring instruments data loggers data recordersanalyzers instrumentation amplifier types of measuring instruments. Classification of measuring instruments electrical. Mcq on measuring instruments 1 how engineering works. Linear measuring instruments are divided into 4 types which are based on the utility. Try to step back in time and imagine a world without measurement tools. The pointer of a moving coil instrument gives full scale deflection of 20ma. Questionnaire a questionnaire is a data collection instrument consistant of a series of questions and other. There are many types of display devices, ranging from simple scales and dial gages to sophisticated computer display systems. Electrical instruments measure the various electrical quantities like electrical power factor, power, voltage and. The electrical instrument is used for measuring electrical quantities likes current, voltage, power, etc. Electrical methods of indicating the output of the detectors are more rapid than mechanical methods. Selection and use of a microphone the selection of the microphone is based on. Distance measuring equipment aviation altimeter, height.
It introduces roundness and cylindrical profile measuring instrument. Measuring instruments play indispensable roles in the development and production of electronic equipment. That is why the best measuring instruments are necessary. The magnitude of one of the quantity is unknown, and it is compared with the predefined value. Without these instruments, it is not possible to measure the dimensions of the specimen. Double prismatic guide of 30 020 011 0 150 014 40 0. Classification of measuring instruments the instrument used for measuring the physical and electrical quantities is known as the measuring instrument. Kikusui group mirrors the growth of technologies in the environmental and new energy electronics fields.
In that time, body parts such as arms and feet were often used as measuring instruments. Taper measuring instruments are used for the measuring slope type of surfaces on the components. These instruments are most widely used in engineering practice because they are simple and inexpensive. They are very reliable for static and stable conditions. Numerous patents ensure unmatched performance from many of our calibration instruments.
List of length, distance, or range measuring devices. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The disadvantage is they are unable to respond rapidly to measurement of dynamic and transient conditions. The physicals quantity like voltage, current, power and energy are measured through the analogue instruments. Measurement and instrument theory 1 mcqs with answers. The term has its origins in the art and science of scientific instrumentmaking instrumentation can refer to devices as simple as directreading thermometers, or as complex as multisensor components of industrial control systems.
Measure the dc or average value of the rectifiers output signal. Pdf one of the tasks at planning of quality inspection is selection of measuring instruments. Pdf methods for selection of measuring instruments researchgate. Units of measurement and their standards, which is concerned with the establishment, reproduction, conservation and transfer of units of measurement and their standards. Sep 11, 2018 10 measuring instruments and their uses in engineering workshop, autocad commands with pdf.
Kyowa lines up a variety of measuring instruments for applications listed below. Electrical measuring instruments types accuracy precision. Measurement and instrument theory 1 mcqs with answers q1. Darsonval, electrodynamometer, and the moving iron vane. Measurement is an important part of science, construction, art, design and a wide array of other professional fields. But before proceeding further, it good to refresh the definitions and terms used in measurements, instruments. An alminaceramic material is adopted to achieve the significant weight reduction compared with the conventional masters made from a stone or iron. There are a few measuring instruments that are more commonly seen than others.
Taximeter, measure usually includes a time component as well. The measurement, instrumentation and sensors handbook kelm. Electrical measurements pdf notes em pdf notes smartzworld. Instruments are subdivided into active and passive based on whether the output of instrument is produced by the quantity being measured simply changes the magnitude of some external power source. We offer a broad range of products from the field of measuring instruments. The deflecting torque and controlling forces are produced by systems which have inertia and, therefore, the moving. Methods of measurement based on agreed units and standards.
The term measurement means the comparison between the two quantities of the same unit. 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. Use of electrical test equipment test equipment is necessary for determining proper setup, adjustment, operation, and maintenance of electrical systems and control panels. We also use calipers to compare sizes with standards such as a graduated rule. It is the page for our precision measurement equipment. It is unfortunate that an electrical system normally depends upon a mechanical meter movement as indicating device. Linear measuring instruments are used for the measure the straight surfaces of substances. A diameter is the straight distance across a round object. The electrical measurements notes pdf em notes pdf book starts with the topics covering control and damping torques, design considerations type of p. Length of jaws vernier type 30 020 vernier callipers with parallaxfree reading. Noise data contains amplitude, frequency, time or phase information, which allows us to.
Option is communication module for reading measured values and instrument setting. Instrumentation is a collective term for measuring instruments that are used for indicating, measuring and recording physical quantities. If we want to use it for measuring ac voltages, then we have to follow these two steps. In this post we will discuss about classification of electrical instruments. Discover the different types of measuring tools youll need for measuring distances, dimensions, angles, planes, water pressure, temperature, time, speed, miles, ingredients, and blood sugar level. Data collection instruments questionnaire and interview. The dynamic range of typical good quality microphones is thus between 100 and 120 db. In addition to weights and lengths, primitive societies also needed to measure the volume of liquids and the passing of time. Types of applications of measurement instrumentation generalized configurations and. Most of the analogue instrument use pointer or dial for indicating the magnitude of the measured quantity. Convert the ac voltage signal into a dc voltage signal by using a rectifier. Types voltmeters for measuring differences of potential voltage between two points in an electrical circuit. Certain applications of measuring instruments may be characterized as having essentially a monitoring function, e.
Digital instruments have some advantages over analog meters, in that they have high accuracy and high speed of operation. Exact measurement is an absolute must for everyone who wants to guarantee precise and firstclass work. Principles of electrical measurement by slawomir tumanski. Measurement and instruments objective questions and answers pdf free download.
There are a few measuring instruments that are more commonly seen than. These are the devices that are used to measure the angle of the given specimens accurately depending on the device. Rulers are used to measure length, as are meter sticks and yardsticks. Measuring tools and gauges 528 3 side view much larger scale. Rulers are used extensively in design labs and classrooms, while meter and yardsticks are more commonly used for. Manufacturer of precision measuring instruments, gauges. Depending on research type, methods of data collection include. Regardless of metal lead, each thermocouple type is designated a single letter to indicate the two metals used. Optimize selection of noise control devices, methods, materials 3. Classification of measuring instruments instrumentation.
Available is rs232 or rs485 communication type module. When a deflecting force is applied to the moving system, it deflects and it should come to rest at a position where the deflecting force is balanced by the controlling force. Pressure can also be measured by balancing the force produced on a known area against the stress in an elastic medium this. The range of services covers the calibration of pressure and temperature measuring instruments in our accredited dkd. Here we are interested in electrical measuring instruments so we will discuss about them in detail. Types of electrical measuring instruments in hindi. Classification of measuring instruments instrumentation and. Electronic measurement instruments and power supply equipment are essential components for electronics technologies. Creeping in energy metre implies a slow rotation of rotor with only voltage coil excited. In this article we will discuss only types of electrical measuring instruments.
Which of the following meter is an integrating type instrument. The ammeter, voltmeter, wattmeter are the examples of the electrical measuring instrument. Primitive peoples needed measuring to perform tasks such as building dwellings, fashioning clothing and interchanging food. Precision measuring instruments od 1401 lesson 1task 1 calipers calipers are used to measure pointtopoint distances, such as diameters. Types of precision measuring instruments used in industry.
Classification, absolute and secondary instruments, indicating instruments, control, balancing and damping, constructional details, characteristics, errors in measurement, ammeters, voltmeters. The instruments of the standard gage product line were created to satisfy the clients on their query of reliable and. So, we will classify all pressure measuring instruments into three categories moderate pressure measurement, very high pressure. The instruments duty is to measure the given specimen according to the given dimensions. Figure 1 presents an overview of the literature search and is a consort flow diagram of the search methodology. The following is a general procedure for use of test equipment. The visual means of level measurement previously discussed are rivaled in simplicity and dependability by float type measurement devices. Electrical measuring instruments definitions, types. Jul 20, 2014 electrical measuring instruments definitions, types. Mar 15, 2020 basically there are three types of measuring instruments and they are electrical measuring instruments mechanical measuring instruments. Double faced type is laping the double face which can be used for straightness in horizontal and vertical as a reference square. Compact desktop roundness measuring instruments with highend analysis functions offer superior cost performance. Measuring instruments plays a vital role in the engineering workshop. Classification of measuring instruments electrical measurements.
The potential difference across the meter when carrying 20ma is 400mv. Classification of electrical instruments electrical. Many forms of float type instruments are available, but each uses the principle of a buoyant element that floats on the surface of the liquid and changes position as the liquid level varies. Meters, double element and three element dynamometer wattmeter, errors and compensations, measurement of unknown resistance, method of measuring low, measurement of inductance, ballistic. Roundness and cylindrical profile measuring instruments. The instrument to be used is 200a for full scale deflection.
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 have high accuracy and precision. Friends is video me ham apko types of electrical measuring instruments ke bare me bata rahe hai, jisme apko according to the utility. The analogue instrument is defined as the instrument whose output is the continuous function of time, and they have a constant relation to the input. Classification of measuring instruments circuit globe. Types of electrical measuring instruments absolute and. We know deflecting torque, controlling torque and damping torque are present in measuring instruments. Signals that vary in discrete steps and that take a finite number of different values in a given range are digital signals and the corresponding instruments are of digital type. For example, a j type thermocouple is constructed from iron and constantan. With each type, the thermoelectric properties are standardized so that temperature measurements are repeatable. This type of instruments records the magnitude of the quantity to be measured continuously over a specified period of time.
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