A digital multimeter, sometimes known as a digital voltmeter or dvm slightly inaccurately as it measures amps and ohms as well as volts, is an instrument which is used for making electrical and electronic measurements. This instruction manual explains how to use your digital multimeter. How to check a transistor with a digital multimeter sciencing. Multimeter guide for dummies the customize windows. How to test a relay with a multimeter step by step guide. You can read all about peak to peak vs rms voltages here ac voltage is great for power plants because its easy to transform ac voltages using a transformer up to 50kvac for long distance travel and then down to 240vac or. How to check a mosfet using a digital multimeter homemade. Jul 08, 2019 the post explains how to test mosfets using multimeter through a set of steps, which will show help you to accurately learn the good or faulty condition of a mosfet.
Id at least measure voltage between phase, neutral and earth. Features of digital multimeter digital multimeter is the most advanced instrument that makes use of modern integrated circuits for making electrical measurements. Lawrence university physics slu physics using a digital multimeter department of physics revised. Prior to testing capacitors, resistance, diodes, or continuity. We will be using the sparkfun vc830l throughout the tutorial, but these methods should apply to most multimeters. There is a display at the top where you can read the measurements results, there is usually a round dial to select different types of measurements, and there will be some probe connectors similar to an audio jack youd hook a pair of headphones up to that hold the test probes. Never attempt to use the meter at a setting combination marked as blank on the scale. This article provides seven measurement tips on how to improve measurement throughput using a digital multimeter. How to use a multimeter beginners guide random nerd. Place the black probe on the ground terminal of the circuit and red probe at the testing point. To use a digital multimeter to measure voltage, start by putting the black probe in the common terminal and the red probe in the terminal thats marked for measuring volts.
Testing a transistor with a digital multimeter engineering. The basics of digital multimeters ideal electrical. To measure ac voltage place the red lead at v slot and black lead at com slot as shown in the picture below. They are available in two varieties, analog and digital. Mosfets are outstanding devices when it comes to amplifying or switching of various kinds of loads. A multimeter is an electronics testing device that, um, tests multiple things, including resistance, voltage, and current. Analog multimeters limited its users to just some specific jobs such as measuring voltage, current and resistance. Digital multimeters can test diodes using one of two methods.
Most of the conventional multimeters will not have the option to measure ac current, hence we will discuss only about measuring dc current, however if you are looking for a instrument to measure current clamp meter. Simple instructions on how to use a digital multimeter our. For appliance and electronic repairs, buy a digital, not analog, multimeter. Though transistors are also largely applied for the above purposes, both the.
Multimeters are used in all areas of electronics to determine the voltage, amperage or resistance in an electrical circuit. A digital multimeter can be used as a fast and simple way to check a transistor for open or shorted junctions. You can do that by changing the digital multimeter mode to ac voltage and then measure the voltgae between neutral and earth. Capacitance is measured in farads, using a multimeter with capacitance settings, it can measure capacitors as small as a. Dec 20, 2015 in this video i am showing how to use digital multimeter and how to read dc and ac voltages,current,resistence,continuity,capatiance and temperatures all these measurements can read a digital. View the reading and be sure to note the unit of measure. Digital multimeter, 8 function acdc voltage and current. Pdf how to use a digital multimeter prasetiyo lukman. How to use a multimeter for starters, lets go over some of the different parts of a multimeter.
The dt9205a multimeter offers you several amplitudes of measurement with which to test electrical components for voltage, resistance or continuity. Fully read and understand this manual before using this digital multimeter. 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. Jul 21, 2017 how to use a multimeter for starters, lets go over some of the different parts of a multimeter. If you are using the highcurrent setting, be sure to use the right jack. Always check of damaged or worn out parts before using the digital multimeter. The digital multimeter dmm is an essential tool in every electronic enthusiasts arsenal. Youve learned how to measure voltage, current and resistance, and how to check continuity. Symptoms are shown in terms of measured voltages that are incorrect. Similarly, with the positive lead connected to the collector and the. These circuits can be damaged or destroyed by high current flow. Diode test using a multimeter how to test a transistor with a multimeter. There are many different types, with widely varying accuracies. Oct 12, 2017 the following video shows how to measure ac mains voltage using a multimeter.
Inspect the condition of the test leads and the multimeter for any damage before operating the meter. How to use a multimeter to measure voltage, current and. Digital multimeters photo 2 have lcd readouts and do continuity testing. Digital multimeters are widely accepted worldwide as they have better accuracy levels and ranging from simple 3. Simple instructions on how to use a digital multimeter. How to use a digital multimeter what is a multimeter. Connect the probe tips across the component or portion of the circuit for which you want to determine the resistance. The post explains how to test mosfets using multimeter through a set of steps, which will show help you to accurately learn the good or faulty condition of a mosfet. Texas instruments add3501 is a monolithic cmos ic designed for use as a 3 2digit digital voltmeter. The two most common uses for a multimeter are to test voltage and resistance. You will gain insights into the critical parameters of a sensor, irrespective of its physical measurement types, learn about key considerations for choosing the right digital multimeter for sensor testing and characterization and lastly discover methods for characterizing and troubleshooting a sensor using a.
Previously, we have talked about the theoritical basics about a typical multimeter and in this multimeter guide for dummies we will learn how to use a multimeter for diy electronics works as well as in everyday life. A range resolution accuracy overload protection 200mv 100. How to check earthing using handheld digital multimeter. A digital multimeter can be used for voltage, resistance, current, continuity, resistance, capacitance to test transistors,even the internal resistance of capacitor in out the circuits. Jan 31, 2020 the creation of digital multimeters has revolutionized the way electricians troubleshoot electricity. This digital insulation camp meter is a handheld 6000count instrument that is designed for use in the laboratory, field servicing, at home. View and download projecta dtb information sheet online. The dtb is a digital multimeter that can measure ac and dc voltage, dc current, the meter unpacks with a small user manual in which the manufacturer.
This meter is designed to test or measure ac voltage, dc voltage, batteries, dc current, ac current, resistance, diodes and continuity. Fit the black probe in common plug and the red probe in vw plug. Several faults that can occur in the circuit and the accompanying symptoms are illustrated in below figure. Digital multimeters dmm, dvom have a numeric display, and may also show a graphical bar representing the measured value. The diode test using an analogue multimeter can be extended to give a simple and straightforward confidence check for bipolar transistors. Featuring improved audible and visual indicators, the industrys leading lcd display size, and easy to read markings. Basic measuring of resistance, voltage and current using digital multimeter many have such features as peakhold display that provides shortterm memory for capturing the peak value of transient signals as well as audible and visual indications for continuity testing and level detection. The astroai true rms digital multimeter is designed to be safely and accurately used by professionals in a commercial setting or weekend dyers that need a little more utility from their standard digital multimeter. Before using, read through this manual to reduce the risk of fire, electric shock. To check the relay whether its good or faulty one, we need to check the resistance of a coil.
The digital multimeter dmms feature a digital or liquid crystal display lcd. In this course we will frequently use a digital multimeter to measure the voltage, current and resistance of circuit elements, such as batteries. Figure 2 measuring resistance with digital multimeter. Basic measuring of resistance, voltage and current using. Dtb pocketsize digital multimeter technical specifications, operating instructions and schematic diagram. The basecollector junction is one diode and the baseemitter junction is the other. The display also alerts you to any pertinent symbols and warnings. Anyway, lets get started actually using a multimeter. You can measure several different magnitudes of these quantities by adjusting the dial on the surface of the multimeter. Aug 14, 2016 a digital multimeter can be used as a fast and simple way to check a transistor for open or shorted junctions. 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. In some cases it may be necessary to remove one end of the diode from the circuit in. If you disconnect the multimeter, your circuit wont work.
A multimeter allows you to understand what is going on in your circuits. How to check a transistor with a digital multimeter. This series are a series of compact pocketsized 312 digit multimeter. There is a diagram of the front of the multimeter given in fig. Jul 29, 2015 one of the most important step of progressing in diy electronics work is knowing to use a multimeter. How to use a digital multimeter and analog multimeter. Check the relays coil terminals using a multimeter. Heres a look at the features and capabilities of dmms, as well as how to use them safely. Unauthorized modification may impair the function andor safety and could affect the life of the equipment. Toattentionavoid possible electric shock or personal injury, and to avoid possible damage to the meter or to the equipment being tested, adhere to the following rules. Mastech mas830b operators instruction manual pdf download. I will also show you how to test for both resistance and continuity.
It is the quick and accurate way of carrying out this test. Although each model of digital multimeter will look slightly different, theyre all set up the same way. A digital multimeter is an indispensable tool for testing, diagnosing, and troubleshooting electrical circuits, components and devices. The multimeter acts as if it was a wire in your circuit. In this beginners guide, weve shown you how to use a multimeter. While ac voltage is rarely measured using digital multimeter it is still important at places where ac mains are involved. There are specific applications for which the digital multimeter was designed. In some cases it may be necessary to remove one end of the diode from the circuit in order to test the diode. Digital multimeter use and care do not modify the digital multimeter in any way. A digital multimeter is a very useful tool for checking electronics circuits and parts, and testing batteries. An202 a digital multimeter using the add3501 introduction this application report discusses how to use texas instruments add3501 as a digital multimeter. Multimeters contain sensitive circuits capable of precision measurements of tiny currents and voltage. Verify the meters operation by measuring a known voltage before and after using the meter. Now set the mode by using the knob, we have to place it at ac voltage symbol shown in picture below.
Before measuring the current, be sure that youve plugged in the red probe in. Pdf an approach to the design of a digital multimeter based on the use of dual slope adc is described in this paper. Well be measuring the voltage of a aa battery, the current draw of a wall clock, and the continuity of a simple wire as some examples to get you started and familiar with using a multimeter. The creation of digital multimeters has revolutionized the way electricians troubleshoot electricity. Summary of contents1 fluke multimeter user manual2 klein multimeter user manual3 mastech multimeter user manual4 craftsman multimeter user manual5 amprobe am530 multimeter user manual6 fieldpiece hs33 multimeter user manual7 tacklife cm02a multimeter user manual8 uei test instruments dl369 multimeter user manual9 extech ex330 autoranging mini multimeter user manual10 etekcity msrc600 digital. These versitiale devices can be used to test and diagnose a wide range of circuits and components. The npn transistor should show an over limit message, and for the pnp, a voltage drop between 0. Then, set the multimeter to the kind of voltage youre measuring if it doesnt have an autorange function. For this test, you can view the transistor as two diodes connected as shown in below figure for both npn and pnp transistors. Do not switch between testing modes with the multimeter connected to a circuit. This multimeter is connected inline with the wire or component by breaking circuit a part to measure the. Using certain multimeter models, you can test to be sure that components such as diodes, capacitors, and transistors function properly. Digital multimeter working principle analyse a meter.
One particularly usefull skill is knowing how to test a transistor using a digital multimeter. Download free guide to using a multimeter guide to using a multimeter guide to using a multimeter a multimeter is a measurement tool absolutely necessary in electronics. That is why most meters have a separate jack for high current measurements. How to use a digital multimeter for dummies housetechlab. In the relay, there is a coil and that coil has some resistance, using that resistance knowledge we can find that the relay is a good one or not. Engineered to exceed the expectations of the professional electrician the sperry instruments dm6400 8 function28 range digital multimeter offers a durable and ergonomic impact resistant design manufactured to the latest industry standards. In a pinch, a dmm can even substitute for expensive, specialized test equipment. Measurement readings are displayed as numerical values on the lcd display. Digital multimeters are widely used portable measuring instrument which has the advanced features than analog meters such as auto polarity, auto zeroing, auto ranging and automatic shut off. When the multimeter is used as a voltmeter or an ohmmeter, you will insert two wires into the meter. Digital multimeters and clampmeters use different techniques internally, to measure ac, dc voltage, resistance and amperes. Learning how to use a digital multimeter is much simpler to read and you can change the functions on it more easily. Again the test using a multimeter only provides a confidence check that the bipolar transistor has not blown, but it is still very. A digital multimeter dmm is a test tool used to measure two or more.
For the emitter to base step, connect the positive multimeter lead to the emitter and the negative to the base. Our dmm adopt rotational switch which situated at the middle of the front cases. High for logic 1, low for logic 0 and for pulse reading will be displayed on the screen. Ive looked long and hard for a good, lowcost multimeter and the vc830l is everything i need in a daytoday multimeter. Reducing test times translates into lower costs and faster timetomarket. This digital multimeter is a generalpurpose instrument designed for use in general electronics, home electrical applications, and automotive electricalelectronic systems. Pdf new digital multimeter for accurate measurement of. Digital multimeters and clampmeters use different techniques internally, to. Multimeters are a tool that we use to measure multiple characteristics of electronics.
If you have a digital multimeter that functions with capacitance settings, then feel lucky. Analog versions are cheaper to buy and are fine for establishing a current, but if you need a level of accuracy, a digital version is much. A digital multimeter or dmm is a useful instrument for measuring voltage, current and resistance, and some meters have a facility for testing. How to use a digital multimeter measure voltagecurrent. You can also troubleshoot your circuit to see where current is failing and pinpoint the problem. Current measurement using multimeter electronics hub. The sparkfun digital multimeter, h favorited favorite 40. Astroai user manual true rms digital multimeter thank you for purchasing the true rms 6000 count digital multimeter from astroai. The first digital multimeter was introduced in the late. A transistor amplifies current because the collector current is equal to the base current multiplied by the current gain, b. The base current in a transistor is very small compared to the. If playback doesnt begin shortly, try restarting your device. Jul 25, 2019 a digital multimeter is an indispensable tool for testing, diagnosing, and troubleshooting electrical circuits, components and devices. Today, digital maultimeters, also referred to as dmm provide more than these three uses.
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