please click HERE, To "SUMMIT" new topic(s), develop a new topic OR you did not see your topic on our site but want to confirm the availiability of your topic click HERE, Do you want us to research your new topic? Some advanced digital multimeters have microprocessors and can store the readings for further processing. Here, a significant portion of the current to be measured bypasses through the shunt. By selecting different values of shunt resistance, we can obtain different scales of resistance measurement. Digital Multimeter. A Digital Multi-meter displays the quantity measured as a number, which prevents parallax errors. It is commonly known as DMM. Warming of the meter during its use can change its properties leading to errors in measured value. The software programming has been incorporated using MPLAB and PROTEUS. A multimeter is mainly used to measure the three basic electrical characteristics of voltage, current, and resistance. Analogue multimeters continuously read the test value. 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DEPARTMENT OF ---- A coil moves in a magnetic field when current passes through it. test and tag brisbane, An Online Resource for Electronics and Communications Study Materials. When we used what we have learned of microprocessors and adjust the program to calculate and show the measures in the LCD, keypad selected the modes. Further hand held oscilloscopes are now in market, which shows the Technology change. There are two two types of multimeter: analogue and digital multimeter. The multimeter diagram is shown above that includes three parts like display, knob, and ports. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project. They cause less meter loading effects on the circuits being tested. The results are not accurate unlike DMM. A multimeter is a tool basically used to measure current, voltage and resistance.. Vm = Voltage across the moving coil. 1.7 APPLICATION OF THE PROJECT Im = Ifs = Full scale deflection current of meter. In this way the optimum accuracy and significant number of figures can be read. A typical multi-meter may include features such as the ability to measure voltage, current and resistance. --/H2013/01430 1.7 BENEFITS OF ANALOG MULTIMETER. Analogue multimeter does not have any digital circuitry. The primary divisions on the scale are 50 and 100. In this chapter all the method used in carrying out this work was discussed. For the measurement of alternating current and alternating voltage an additional feature called the rectifier circuit is required. The whole process of the digital multi-meter is controlled by PIC 16F887 microcontroller. In order to ensure that they work perfectly, the calibration process is required. Measurement of direct current, voltage, are done with moving coil instrument. A digital multimeter or DMM is a test equipment used for resistance, voltage, current measurement, and other electrical parameters as per requirement and displaying the results in the mathematical digits form on an LCD or LED readout. The main aim of the project is to build a hand-held device that uses LCD to display readings useful for basic fault finding and field service work, or a bench instrument which can measure to a very high degree of accuracy. A list of commonly available moving coil current meters is given this topic. DMMs can be used in testing continuity, capacitors, diodes and transistors. Construction. This work discusses about digital multimeter [3]. The ammeter diagram is shown below. In this system, a typical multi-meter may include features such as the ability to measure AC/DC voltage, DC current, resistance, temperature, diodes, frequency and connectivity. A Multimeter is an electronic instrument, every electronic technician and engineer's widely used piece of test equipment. 30. A multimeter is a tool basically used to measure current, voltage and resistance. Construction and Components of Multimeter The multimeter basically consists of a bridge DC amplifier, rectifier, PMMC meter, function switch, internal battery and an attenuator. It was identified that the magnetic field produced by the current carrying conductor that was responsible for that deflection. A multimeter is a tool basically used to measure current, voltage and resistance. The work is organized as follows: chapter one discuses the introductory part of the work, chapter two presents the literature review of the study, chapter three describes the methods applied, chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendations. Your email address will not be published. While selecting the range, ensure that the maximum range is above than that is expected. Multiplying Factor is basically the value by which the range of voltmeter can be extended. The whole process of the digital multi-meter is controlled by PIC 16F887 microcontroller. A multimeter is a device that combines multiple circuits into one. This service is legal because, all institutions permit their students to read previous projects, books, articles or papers while developing their own works. The meter acts as an ammeter with a low series resistance to measure direct current. Do you want our Bank Accounts? A DMM measures AC / DC volts, AC / DC current Resistance DMM may have a variety of special features that are designed for a wide number of applications . It's utilized essentially to gauge. Unfortunately, their accuracies are mostly proportional to the time period. As it is clear from the name of this instrument, it can make many (multi) measurements with reasonable accuracy such as AC and DC voltages, currents, and resistances. ABSTRACT Resistance measurements on an analog meter, in particular, can be of low precision due to the typical resistance measurement circuit which compresses the scale heavily at the higher resistance values. Parallax errors are eliminated. Following are the benefits or advantages of Analogue Multimeter: 1.7 APPLICATION OF THE PROJECT. 1.1 BACKGROUND OF THE STUDY. Design And Construction Of An Analogue Multimeter 9,000.00 2,999.00 This work is on an analogue multimeter. By This is the maximum that the range can read. Below are listed all undergraduate, master, and doctorate full scholarships in the field of Electrical and Electronic Engineering for B. In this system, a typical multi-meter may include features such as the ability to measure AC/DC voltage, DC current, resistance, temperature, diodes, frequency and connectivity. CHAPTER TWO: The chapter one of this work has been displayed above. Then the dial or scale of the current meter can be calibrated in terms of volts. A multimeter is also known as a multitester, or a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit. A Digital Multi-meter displays the quantity measured as a number, which prevents parallax errors. Unlike analog multimeters, zero adjustment is not required. Ideally the resistance of voltmeter should be infinite. This is to certify that the research work, "design and construction of a digital multimeter" by ---, Reg. This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. 3.3 CIRCUIT OPERATION AND DESCRIPTION needle rests to the extreme left of the scale from where the scale begins with zero [3]. This work is on the design and construction of digital multi-meter using PIC microcontroller. The performance of such electronic test meters is better than the conventional type of multimeters. However in spite of the refinements and the new measuring instruments the suspension galvanometer has still its use in high sensitivity laboratory measurements, provided the delicacy and portability are not very important. As time passes, they may function incorrectly and generate some errors. With the advent of Integrated circuits, the size, cost and power requirements of digital multimeters has been drastically reduced. It is commonly known as DMM. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved. The software programming has been incorporated using MPLAB and PROTEUS. 1.4 OBJECTIVES OF THE PROJECT. Subject - Electronic Instruments and MeasurementsVideo Name - Introduction to Digital MultimeterChapter - Analog and Digital InstrumentsFaculty - Prof. Shrut. Avometer or multimeter is a tester (instrument) that is used to measure electric current (both AC and DC), the potential difference between two points in a circuit, and also measures resistance in a circuit. To carry out the design consideration and production of a useful consumer product of PIC microcontroller. Analogue multimeters have been in use for very many years and sometimes go by the name VOA as a result of the fact that they measure volts, ohms and amps. In this system, the analogue input is taken directly to the analogue input pin of the microcontroller without any other processing. The reading speed is increased as it is easier to read. The multimeter consists of shunts multiplier resistors in it with a switching arrangement for selection of the quantity to be measured and its range. The complete Project Material/writeup include: Abstract + Introduction + etc + Literature Review + methodology + etc + Conclusion + Recommendation + References/Bibliography.Our aim of providing this " design and construction of a digital multimeter" project research material is to reduce the stress of moving from one school library to another all in the name of searching for " design and construction of a digital multimeter" research materials. Remarkable post, The information you have mentioned is really knowledgeable and engaging for us, I really enjoyed reading it. A digital multimeter is a device which provides combined functionality of ammeter, voltmeter and ohmmeter. Order full work to download. 1.5 ADVANTAGES OF THE PROJECT, 1.6 LIMITATION OF THE PROJECT. Required fields are marked *. Taking a reading with an analog multimeter Analyzing from top to bottom on the scale display: The top scale is the ohmic or resistance scale. Accuracy is increased due to digital readout. They are expensive due to high manufacturing cost. CHAPTER FOUR This comes about because the meter must draw a certain amount of current from the circuit it is measuring in order for the meter to deflect. Resistance measurement also uses measurement of current. V = Full range voltage of meter. They are cheaper compare to digital meters. Some advanced digital multimeters have microprocessors and can store the readings for further processing. Best Compact: Extech EX330. After testing different multimeters from both these brands, I can say one thing. And this coil is free to rotate in the field of a permanent magnet. 1.1 BACKGROUND OF THE STUDY This project topic (design and construction of a digital multimeter) have complete 5(five) Chapters. They are expensive due to high manufacturing cost. evaluate a 5.5 or 6.5 digit voltmeter. This lightweight, compact multimeter comes with a built-in thermometer and is perfect for on-the-go readings. You can make mistake in reading the scale in analog multimeter, but digital multimeters have a LCD display to show accurate reading. Assumption in an electric or electronic circuit can lead to failure or loss of lives by electrocution. The complete chapter two of " design and construction of a digital multimeter" is also available. Portable size makes it easy to carry anywhere. The coil is wound on an aluminum former or bobbin. We have made academic project research pretty easy and fun. The mistaken results from such instruments can cause serious problems in economic system and life safety since they will be used for validating product standards in the importing and exporting industries. To improve the circuit adds an op-amp in front to present greater impedance to the circuit under test. A multimeter, also known as a volt-ohm meter, is a handheld tester used to measure electrical voltage, current (amperage), resistance, and other values. A multimeter is a permanent magnet moving coil galvanometer. Way back in seventies the electronic voltmeters used vacuum tubes and latter the transistors. It consists a needle to indicate the measured value on the scale. We use a rectifier to measure an AC voltage or current with the multimeter. But when it comes to toughness, the Fluke multimeters have the advantage. There is an iron cored coil pivoted on two jeweled bearings. All functioning electronic gadget or electric device operates with electronic parts or electric wiring which can fail at any time due to some abnormalities such as aging, under or over-voltages and intermittent power loss. And this coil is free to rotate in the field of a permanent magnet. We can categorise the multimeters into two groups, namely analog multimeter and digital multimeter. Required fields are marked *. Analog multimeters uses a microammeter with a moving pointer to display readings while Digital multimeters (DMM, DVOM) have a numeric display, and may also show a graphical bar representing the measured value. This project- construction of a digital voltmeter seeks to utilize the microcontroller to build a digital voltmeter having better accuracy by utilizing a successive approximation analogue to digital converter ADC to measure the voltage (0 - 250V). Warming of the meter during its use can change its properties leading to errors in measured value. Elementary method of knowing current flow through a conductor was to Use a compass needle. A multimeter is a permanent magnet moving coil galvanometer. When the battery is low, the display will be dim, making it difficult to read. Though we call it as an electronic voltmeter, it can be used as multimeter in a laboratory or service station. This work is on the design and construction of digital multi-meter using PIC microcontroller. This combination of moving coil and multiplier is connected across the point whose voltage is to be measured. In this system, a typical multi-meter may include features such as the ability to measure AC/DC voltage, DC current, resistance, temperature, diodes, frequency and connectivity. And this coil is free to rotate in the field of a permanent magnet. My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. They are vulnerable to shock and vibration. There is an iron cored coil pivoted on two jeweled bearings. 1.2 PROBLEM STATEMENT. The resistance material used for multipliers is Manganin and constantan (copper nickel alloy). The output impedance of the op-amp will be low which a requirement of the PIC analogue input is. improper range setting, improper counting on the scale, wrong setting on AC/DC. Multimeters come in analog and digital versions and are useful for everything from simple tests, like measuring battery voltage, to detecting faults and complex diagnostics. This work is on the design and construction of digital multi-meter using PIC microcontroller. You could start by studying the service manual of Agilent's popular 34401A 6.5-digit multimeter. Such multimeters are economical, for use by a technician. We can give a general name to the electronic instrument that performs the same functions of a conventional multimeter as an Electronic Test Meter (E.T.M.) Multimeter includes a rotary switch on the front panel, used to select different electrical parameters to measure electrical properties. The working principle of an ammeter mainly depends on resistance as well as inductive reactance. As a rough guide, this can be taken to be the highest resistor value near where the meter is connected [3][4]. The principal computerized multimeter was presented in the last part of the 1970s, and has demonstrated considerably more exact and solid than the old needle-based simple meters. There are two two types of multimeter: analogue and digital multimeter. Internally, it's a variant Analogue multimeter is one of the trusty workhorses of the electronics test industry for basic fault finding and field service work which is also used by: 1.8 PROJECT ORGANISATION. This design uses USER'S INSTRUCTIONS: The project work you are about to view is on "design and construction of a digital multimeter". The trend changed and now we have Digital Voltmeters and Digital Multimeters. PROJECT DESCRIPTION: This work " design and construction of a digital multimeter" research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. Order full work to download. ammeter. However considering the cost aspect of the digital multimeter, the conventional analog meter still survives owing to its low cost; with technicians. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen. A multimeter is basically a PMMC meter. The pointer movement is slow, cant be used to measure voltages with frequencies higher than 50 HZ. This makes them free from wear and shock failures. A typical multimeter can measure voltage, resistance, and current, in which case it is also known as a volt-ohm-milliammeter ( VOM ), as the unit is equipped with voltmeter, ammeter, and ohmmeter functionality. The most basic multimeter measures voltage, current, and resistance. There is an iron cored coil pivoted on two jeweled bearings. So the input range is from 0V to 5V the maximum source impedance is 2k5 (for testing use a 1k pot). A multimeter is a tool basically used to measure current, voltage and resistance.. Presently, fully automatic calibration systems have been used worldwide and they play an important role in the calibration of measurement instruments. The coil is wound on an aluminum former or bobbin. These are classified into two types like analog and digital which are discussed below. They both deliver durable digital multimeters. --- The auto-ranging feature of a digital multimeter helps in selecting different measurement ranges, which can prevent damage to the meter if the wrong range is selected. These multimeters are extremely flexible and enable very many faults to be found in an electronic circuit [1]. The work is organized as follows: chapter one discuses the introductory part of the work, chapter two presents the literature review of the study, chapter three describes the methods applied, chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendations. The auto-polarity function can prevent problems from connecting the meter to a test circuit with the wrong polarity. 2. An analog multimeteris the most commonly used instrument by technicians and engineers in the laboratory as well as other repair works. This device includes extremely less impedance because it must include less amount of voltage drop across it. It is most widely used due to its small size, price and ease in operation. Such multimeters are of high quality and have more features. When an electric or electronic circuit fails, the maintenance personnel needs not to troubleshoot the circuit or circuits components just by assumption. Inexpensive analog meters may have only a single resistance scale, seriously restricting the range of precise measurements. A multi-meter or a multi-tester, also known as a volt/ohm meter or VOM, is an electronic measuring instrument that combines several measurement functions in one unit. A multimeter is a tool basically used to measure current, voltage and resistance. The LCD display depends on a battery or external power source. Their resistance should not change with time. 3.2 CIRCUIT DIAGRAM In this blog the following topics are covered: Sensitivity of an ammeter and its expression, List of commercially available moving coil ammeters, Method of extension of the range of an ammeter, Procedure for measurement of internal resistance of an ammeter, Probes that are additional accessories to multimeters. If there are slight changes in readings, the needle of an analog multimeter will track them. This makes them free from wear and shock failures. The digital nature makes it unsuitable for adjusting tuning circuits or peaking tunable responses. Nowadays many measurement instruments have been used in all laboratories throughout the world. 1.3 AIM OF THE PROJECT. INSTITUTE OF ---. 1.8 PROJECT ORGANISATION. A typical multimeter can measure voltage, current, and resistance. 1.5 ADVANTAGES OF THE PROJECT, 1.6 LIMITATION OF THE PROJECT, 1.7 APPLICATION OF THE PROJECT. Save my name, email, and website in this browser for the next time I comment. We can change the range of the ohmmeter by connecting a switch to a suitable shunt resistance.