To test for a live circuit, many will reach for the familiar test light. The auto ranging meter I use in the video has three different settings for measuring current depending on how much current you are measuring; micro-Amps (µA), mili-Amps (mA), and Amps (A). Share it with us! You’ll get the same result by measuring from either the positive or negative side of the circuit, but as a best practice, I always disconnect the negative side. In this post, I’ll walk you through step by step on how to perform a variety of tests with a multimeter. Then, just touch one test lead to the positive side of the component and the other test lead to the negative side. Digital multimeters incorporate amplifiers, which use the same principles as analog multimeters for resistance readings. When we talk about range in the context of digital multimeters, it is typically in reference to the different settings available on a manual ranging meter like the one shown above. I go into great detail on this topic in my Subwoofer Wiring Guide post. This happens when a circuit in your vehicle stays on or draws current in some way when it should normally be off when the vehicle is off. In addition, the backlit display and ergonomic design ensure that you will have a good user experience. They are designed such that they have the auto-ranging feature in which the device itself selects the required range of the quantity that is to be tested which in turn enables us to see the significant digits only. Troubleshoot your broken rig by checking the bias voltages against the service manual. Installing a remote start and security system, for example, where you need to be able to identify all of the ignition switch circuits, door lock circuits, brake wire, parking lights, etc. They have a feature of graphic representation due to which fast-moving trends can be easily jotted down. Every electrician apprentice should know the basic functions and how to use a digital multimeter. [2] X Research source The arc-shaped marks on the meter dial face may be different colors that indicate each scale, so they will have different values. When you’re measuring voltage, you are measuring the difference in potential, or voltage, across a particular portion of the circuit. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on WhatsApp (Opens in new window), Click to share on Skype (Opens in new window), Click to email this to a friend (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Tumblr (Opens in new window). This is intended to be a brief introduction to how multimeters work and their basic functions. To reconnect the circuit with the meter, attach the black test lead to the source side of the circuit and the red test lead to the load side. eval(ez_write_tag([[336,280],'mobileinstallguide_com-medrectangle-3','ezslot_4',118,'0','0']));So let’s dive in! Fluke Corporation, a subsidiary of Fortive, is a manufacturer of industrial testing equipment including electronic test equipment. Instead, you would set it to the 2-20V range because 12V falls within that range. The handheld digital multimeter (DMM) is a basic tool for ham radio applications. You have here a picture of a multimeter symbols. Resistance (Ω): This measures how much resistance there is in the circuit. If this sounds really confusing, don’t give up yet! And for those of you who are more visual learners (like me! Multimeters come in two types: analog and digital, with digital multimeters being the most common due to its affordability and precision. 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. And what better place to start than why you’ve made a smart choice in learning how to use a digital multimeter over other alternatives. You can find and purchase the products mentioned in this blog post on Eezee’s procurement platform. 7. However, since digital multimeters are made using the integrated circuit technology, they provide more facilities like measurement of capacitance in farads, temperature in both Celsius as well as Fahrenheit degrees, frequency in hertz, Inductance in Siemens, transistor tests and many more. Integrated circuits are used; hence, making it easy to record the measurement. I found a  great video on YouTube that gives you a basic understanding of how to use a digital multimeter. Notify me of follow-up comments by email. With Eezee’s help, you can compare the product offerings and listings using the fully integrated search engine. If you run into this problem on an otherwise healthy battery, the cause is usually a parasitic drain on your electrical system. View mobileinstallguide’s profile on Facebook, What is the Big 3 Upgrade – And How to Install it, Multimeter Uses and Functions – How to Use a Digital Multimeter. 9. Before you can take a voltage measurement, first you need to set your meter up to measure DC voltage. They are also used to check, if small currents are present in certain circuits. Check for good DC continuity between the ends of the TNC cable you just soldered. If you would like to know more about the functions, specifications and performance of this multimeter, check out our next post for a detailed and comprehensive Brymen BM869s multimeter review. Turn on your multimeter and place the selector switch to the. Being a bit of a test equipment junkie, I own quite a few DMMs. If you see a – symbol in front of the reading then switch your leads (this means the polarity is backward). This site uses Akismet to reduce spam. Uses of Multimeters. In the video, I show you an example of using continuity to quickly find a blown fuse in a fusebox. Let me know your ideas to add to the list. In addition to the normal current, voltage and resistance ranges, the 3320 has auto-ranging, diode check, continuity check and battery test mode included. Figure out if the AA batteries the kids left for you are dead. The source is either dead or the circuit is off. Then plug the black test lead into the port labeled COM or common and the red test lead into the port with the same DC voltage symbol. Unless you know the range of current you expect to be measuring, when you’re determining which setting to use on the meter, it’s always a good idea to start with the highest range first. If you happen to come in contact with a wire leading to one of these circuits with a test light, the current that is drawn by the test light can quickly damage the circuit board. When you test for continuity, you’re testing if there is a continuous path for current to flow between the two points that you place your test leads. Previously, analog multimeters were widely used. India, an Incredible Destination for Technology Professionals, How to apply for a Tourist Visa in South Korea, Download 1,300 Fonts For Your iPad and iPhone. Set the dial to the setting marked with a V (for voltage) with a straight line by it like the one in the picture.

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