Digital display digital multimeter dmm electronic volt ohm millimeter with digital display. Multimeter notes in the lab we will use a digital multimeter dmm to measure resistance, voltage, and current in our circuits. In this learning activity youll explore the functions and proper operation of a digital multimeter. A digital multimeter dmm is an instrument that can measure several basic electrical quantities and shows the measurement with a number in a display. The dm62 and dm66 digital multimeters combine a rich feature set, precise measurements, and quality construction into tools of exceptional. Introduction the dvm810 is a compact multimeter with a 3 12 digit lcd for measuring dc and ac voltages, dc currents, resistance, diodes and transistors hfe. View logged values graphically in the field right on the meter. To better understand digital multimeters, its helpful to become clear on the basics of electricity. By combining a versatile 8bit cpu with insystem programmable flash on a. All multimeters measure ac and dc voltage voltmeter, ac and dc current ammeter, and resistance ohmmeter.
There are pushbuttons on the meter to indicate which type of measurement is being made, and other pushbuttons to select the. A digital multimeter dmm may look complicated and intimidating at first glance, but once you understand the display, dial, and port panel, youll have a better grasp of dmm basics. All configurations can be tested and any resulting connection errors are indicated. The construction of the megger is shown in the figure below. In an analog multimeter, the range has to be adjusted by the user. Power dissipation effects when measuring resistors designed for temperature measurements or other resistive devices with large temperature coefficients, be aware that the multimeter will dissipate. In this system, a typical multimeter may include features such as the ability to measure acdc voltage, dc current, resistance, temperature, diodes, frequency and. Do not input a limit value over the range when measuring. Current, voltage, and resistance measurements are considered standard features for dmms. It is an ideal instrument for hobbyists, for use in the field, for laboratories and workshops and for domestic applications. At first glance, a digital multimeter might look pretty confusing and maybe even a bit intimidating.
Tips on choosing and using a dmm, a musthave tool for almost all engineers. The multimeter tests continuity by sending a little current through one. A same meter movement emmc is used to measure all the three quantities. Measurement and instrumentation construction of a digital voltmeter definitiona voltmeter is an instrument used for measuring electrical potential difference between two points of an electrical circuit. This tutorial will show you how to use a digital multimeter dmm, an indispensable tool that you can use to diagnose circuits, learn about other peoples electronic designs, and even test a battery. This animation simulates the action of various electrical quantities. This thesis describes the design and construction of digital multimeter using pic microcontroller. In this post, ill walk you through step by step on how to perform a variety of tests with a multimeter. Connect the red test lead to the vma probe socket and the black lead to the com probe socket max 10a.
A digital multimeter or dmm is 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. Whereas in a digital multimeter, the range is adjusted automatically. A few or todays multimeters have illuminated the display for better viewing in low light situations. The lcd screen present on the upper portion of the multimeter basically displays four or more digits and also shows negative value if necessary. Connect the multimeter to the decade box and to one end of a battery. The meter with holster that is giving the main body, though downsized, high resistance against the shock of a drop. A a digital ohmmeter which you can implement using the bs2 rctime command to measure resistance. General the instrument is a pocket digital multimeter, which is used to measure dcv, acv, and dca, resistance, diode and continuity test. Digital multimeter noncontact voltage tester to 600 v ac magnegrip holster with magnetic hanging strap 600 v acdc 10 amps acdc, fully safety fused resistance to 20 mw continuity beeper 1. In general, stick to dc circuits the settings on the multimeter with straight lines, not curvy lines. How can the working principle of digital multimeter be. The dm383b is a handheld, battery powered digital multimeter that is designed to meet iec 10101 en 610101, standards, the emc directive, and other safety standards see specifications. Introduction analog multimeter multimeter is a combination of a voltmeter, ohm meter and current meter.
This meter is a handheld, battery operated digital multimeter dmm with multifunction. This instrument, kt117, is a digital multimeter which designed for making measurement of the lowvoltage equipment. In this article we will learn how to use a digital multimeter and how this will help us in our journey with electronics, this will be a very basic article which will take your through the different operations of a multimeter will illustrative pictures and videos. Endowed with the key touching function instead of the traditional mechanical knobs, is a new type of 3 56 digital multimeter equipped with the lcd display device with the text height of 33mm which has the merits of visual display, easy operation, stable performance and high reliability. Multimeters can be used for testing batteries, household wiring, electric motors and power supplies. An introduction to the digital multimeter wisconline oer. Generally dual slope integration type adc is prefprred in the multimeters. Digital multimeter principles instructors resource guide. The meter is a handheld 312 digital multimeter for measuring dc and ac voltage, dc current, resistance, diode, transistor and continuity test with battery operated. A digital multimeter dmm is a test tool used to measure two or more. For unattended monitoring of signals over time, to detect intermittent problems.
The digital multimeter is an instrument which is capable of measuring a. The multimeter displays 0 ohms with the leads shorted together. Introduction whats included one autoranging digital multimeter one user manual one set of test leads one 9v battery. Some can also measure other electrical quantities such as frequency or even. In figure 25, the first difference you notice between the multimeter and the lvct is the. At the very basic level you have the device itself, along with two probes, which are the black and red cables that have plugs on one end and metal tips on the other. In this system, a typical multimeter may in this system, a typical multimeter may include features such as the ability to measure acdc voltage, dc current, resistance, temperature, diodes, frequency and connectivity. One of the first and oldest multimeters is theanalog meter, figure 2 and the other, now more widely used meter is the digital multimeter figure 1. At the end of this article you will learn how to measure voltage with multimeter, measure dc current, check for.
Position the selector switch to the desired amp range and switch the meter on. Measurement and instrumentation construction of a digital voltmeter definitiona voltmeter is an instrument used for measuring electrical potential difference between two. Objectives at the end of this exercise you will become familiar with. Digital multimeter is a test equipment which offers several electronic measurement task in one tool. It allows the user to set the multimeter to read different. The first digit on many multimeters is only able to display a 1 so the ranges are limited to1 9. Design and construction of digital multimeter using pic. High accuracy measurement, even with a low power factor. Digital multimeter working principle analyse a meter.
And for those of you who are more visual learners like me. The megger has one current coil and the two voltage coils v 1 and v 2 the voltage coil v 1 is passed over the magnet connected to the generator. The current is converted to voltage by passing it through low shunt. Construction of a voltmeter and an ammeter from a galvanometer. Development of a digital multimeter international journal of. All the quantities are digitized using analog to digital converter and displayed in the digital form on the display. Digital multimeter selection chart best for applications recommended dmm advanced meters advanced industrial troubleshooting, including datalogging and graphing intermittent problems logging. Features of digital multimeter digital multimeter is the most advanced instrument that makes use of modern integrated circuits for making electrical measurements.
A warning identifies conditions and procedures that are dangerous to the user. How to use a digital multimeter measure voltagecurrent. It is a handheld device with positive and negative indicator needle over a numeric lcd digital display. Digital multimeters combine the testing capabilities of singletask metersthe. The digital multimeter principles resource guide provides the framework for handson activities and is a valuable instructional tool for training in group settings everything you need to teach the basics of digital m ultimeter. Laserliner multimeter xp operating instructions manual 88 pages brand. Safety information the fluke 101 complies with iec 610101 cat iii 600 v measurement category. Comparison of digital and analog meter can be damaged when dropped from bench level no usually damaged by rough treatment pointer attempts to deflect to.
The following table summarizes the front panel keys and the menu structure. How to use a multimeter for starters, lets go over some of the different parts of a multimeter. Digital multimeter working principle electrical a2z. The multimeter is an electrical measuring instrument that combines the functions of an ammeter current measurement, a voltmeter voltage measurement, and an ohmmeter measurement of the value of resistance. The basic circuit of a digital multimeter is always a d.
It is an ideal tool for labs, household and wireless enthusiasts. This thesis describes the design and construction of digital multimeter. It can be used to measure dc voltage, ac voltage, dc. It will measure up to volts dc and 750 volts ac in a cat ii environment and up to 600 volts ac and dc in a cat iii environment. The most basic things we measure are voltage and current. The basics of digital multimeters the basics of digital multimeters by jim gregorec, ideal industries, inc.
Digital multimeter principles is part of a comprehensive instructional package and is a must for all technicians, from contractors to maintenance staff. The fluke 101 multimeter the product is a 6000 count instrument. Switch on your multimeter, and set the dial to continuity mode indicated by an icon that looks like a sound wave. Also it is important to select the right accuracy setting for the time that the measurement can be taken. The product is battery powered with a digital display. Not all multimeters have a dedicated continuity mode. Some common quantities are such as inductance, capacitance, temperature, frequency, speed and rms values. An introduction to the digital multimeter by patrick hoppe. Multimeter has multi functionalities like, it acts like ammeter, voltmeter and ohmmeter. The basic building blocks of digital multimeter are several aid converters, counting circuitry and an attenuation circuit. When the pointer of the pmmc instrument deflects towards infinity, it means that the voltage coil remains in the weak magnetic field and thus. In a digital multimeter the signal under test is converted to a voltage and an amplifier with an electronically controlled gain preconditions the signal. Design and construction of digital multi meter using pic. The basics of digital multimeters ideal electrical.
Digital multimeter there are two main types of multimeters. Skip to step 6 for an alternate way to perform a continuity test. Digital muti meter only this meter is a handheld and battery operated digital multi meterdmm with multi function. It is also known as the voltmeter or ohm meter or volt ohm meter. Digital multimeters dmm, once called voltmeters, have been. This dial has scales to indicate values for each of the tests the meter. It is a type of multimeter which functions digitally. The available truevolt digital multimeter dmm models are.
Construction of microcontroller based digital voltmeter. Successful completion of tasks covered in the textbook can be documented by a certificate of completion included in the textbook. Keysight truevolt series dmm operating and service guide. Switched range multimeters have the standard v, a and.