It is basic that the measuring process inevitably alters the characteristics of both the source of the measured quantity and the measuring system itself, from which it must follow that there will always be some difference between the measured indication and the corresponding to. The basic principle of linear measurement mechanical type is that of. The size and type of parts to be measured, the environment temperature, humidity, dust, pressure, and so on, the skills required by operator, and. Unit 5 linear measuring devices and linear measuring. Plain gauge is defined as the dimension measuring or inspective tools, without a scale to measure any manufacturing part of tools. The new generation of mechanical and electronic measuring gauges. Scientists use measuring instruments whenever the can because everything cannot be observed by the senses so measuring instruments are needed instead. Classification, absolute and secondary instruments, indicating instruments. Electrical methods of indicating the output of detectors are more rapid than. In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of realworld objects and events. Learn basics of measuring instruments list the common measuring instruments define least count and what it. The measuring quantity can be voltage, current, power and energy etc.
Mechanical, electrical and electronics instruments. Classification of measuring instruments electrical. Engineering measurements and measuring instruments. This basic knowledge will help you throughout your electrical and electronics engineering. Engineering measurements and measuring instruments home. Mechanical pressure gauges sika pressure gauges are quality measuring instruments for use in industrial applications. Also, gauges consume less time as compared to other measuring devices. Rulers are used extensively in design labs and classrooms, while meter and yardsticks are more commonly used for. Classification of measuring instruments the instrument used for measuring the physical and electrical quantities is known as the measuring instrument. The selection of an appropriate measuring instrument for a particular application also depends on four factors, they are.
The magnitude of one of the quantity is unknown, and it is compared with the predefined value. Rulers are used to measure length, as are meter sticks and yardsticks. The term measurement means the comparison between the two quantities of the same unit. Digital multimeter is an example for the digital instrument. A measuring instrument is a device for measuring a physical quantity. The disadvantage is they are unable to respond rapidly to measurement of dynamic and transient conditions. Classification of measuring instruments circuit globe. They are fitted with stainless steel cases as standard and comply with the en 8371 until en 8373 european standards. Here, i am describing the major concepts of electrical measuring instruments in detail. Without these instruments, it is not possible to measure the dimensions of the specimen. There are a few measuring instruments that are more commonly seen than others.
General characteristics and selection of measuring instruments. The measurement of flow in a plant is important for the control of the process and for troubleshooting problems that may occur. An instrument is a device in which we can determine the magnitude or value of the quantity to be measured. These are designed by our professionals using the highest grade of material to enable strength and high durability.
Mechanical engineering measuring instruments answers. Flow measuring instrument measuring instruments fuel. Measuring instruments plays a vital role in the engineering workshop. This book dwells on the physical aspects of measurement techniques. You can find here about tools and instruments used for measurement of. Moritz gsi, darmstadt, germany abstract mechanical equipment is an integral part of each magnetic measurement.
Mechanical pressure gauges are indicating pressure measuring instruments for gauge, absolute and differential pressure. A manometer is an instrument that uses a column of liquid to measure pressure, although the term is often used nowadays to mean any pressure measuring instrument. Types of precision measuring instruments used in industry. The operator can use gauge without having vast knowledge in operating those mechanical components. The instruments duty is to measure the given specimen according to the given dimensions. Measuring tools and gauges 528 3 side view much larger scale.
These are the devices that are used to measure the angle of the given specimens accurately depending on the device. In this contribution the importance of mechanical tolerances is demonstrated with some examples and the principal rules in order to reduce the influence of mechanical errors are discussed. Chapter 1 mechanical measurement presentation prepared by prof. Electronics and electrical measuring instruments and their. Tutorials from indian institue of technology madras. Fundamentals of instrumentation and measurementedited by dominique placko.
S bharadwaj reddy december 31, 2016 august 14, 2019. For our measuring instruments we use latest sensors, tested in automotive applications millions of times over. Hysteresis linearity resolution of measuring instruments threshold drift zero stability loading effect system response measurement methods generalized measurement system static performance chapter 01 mechanical measurement 3 hours 7% weightage approx. Mechanical instruments are very reliable for static and stable conditions. Types of angular measuring instruments pdf by mohammed shafi march 29, 2020 april 1, 2020. Established standard objects and events are used as units, and the process of measurement gives a number. Before starting any electrical or electronics device installations or studying electrical practical, we should know about the measurements and its 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 have high accuracy and precision. Mechanical and other engineering measuring tools and instruments.
Linear measuring instruments are used for the measure the straight surfaces of substances. Classification of measuring instruments instrumentation. Flow measuring instrument manufacturer of a wide range of products which include measuring instruments fuel dispenser flow meter, mechanical petrol truck fuel meter, analog output fuel flow meter, direct mechanical reading instrument, positive displacement mechanical flow meter and kerosene fuel consumption pd flow meter. Double prismatic guide of 30 020 011 0 150 014 40 0. Important measuring instruments multiple choice questions. For the optimal solution of various applications, we distinguish between the following measuring units. Digital instruments have some advantages over analog meters, in that they have high accuracy and high speed of operation. More concentration should on class room work and text book methodology. 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. Having been trained to deal with mechanical systems, the use of electrical or electronic system to make measurements on these. I probes may be mechanical, optical, laser, or white light, among others.
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