{"id":189752,"date":"2025-05-16T07:29:32","date_gmt":"2025-05-16T12:29:32","guid":{"rendered":"https:\/\/www.artofmanliness.com\/?p=189752"},"modified":"2025-05-17T18:07:05","modified_gmt":"2025-05-17T23:07:05","slug":"multimeter","status":"publish","type":"post","link":"https:\/\/www.artofmanliness.com\/skills\/manly-know-how\/multimeter\/","title":{"rendered":"How to Use a Multimeter"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-189762\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-3.jpg\" alt=\"A digital multimeter displaying readings sits beside two test probes, with text overlay: \u201cHow to Use a Multimeter\u201d\u2014a helpful visual for anyone seeking a quick multimeter guide.\" width=\"650\" height=\"400\" srcset=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-3.jpg 650w, https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-3-372x230.jpg 372w, https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-3-320x197.jpg 320w, https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-3-640x394.jpg 640w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><br \/>\nA <a href=\"https:\/\/amzn.to\/3H0T0RD\">multimeter<\/a> is invaluable for the DIY troubleshooting of electrical problems around the house. You can use it to identify faulty wiring, check if electrical sockets have power, and test batteries. My electrical engineer brother-in-law, Ryan Davis, recently showed me how to use one. Here\u2019s a write-up of what I learned. Maybe you\u2019ll find it handy.<\/p>\n<h2 id=\"h.7m6hvi3or6dr\">What Does a Multimeter Measure?<\/h2>\n<p>A multimeter measures three electrical properties:<\/p>\n<ul>\n<li><strong>Voltage (Volts)<\/strong>: The electrical potential difference that pushes electrons through a circuit. Measure voltage to check battery charge or verify power in outlets.<\/li>\n<li><strong>Current (Amps):<\/strong>&nbsp;The flow of electrical charge through a conductor, indicating how much electricity is moving through a circuit. Measure current to verify that circuits or devices are drawing the correct amount of electricity.<\/li>\n<li><strong>Resistance (Ohms)<\/strong>: How much a material opposes electrical flow. Higher resistance means less electricity flow. Measure resistance to check component continuity, verifying that a wire or fuse isn\u2019t broken.<\/li>\n<\/ul>\n<h2 id=\"h.4z6gug6n2yzb\">Basic Multimeter Components<\/h2>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image10.jpg\" alt=\"Image10\" width=\"537\" height=\"600\"\/><\/figure>\n<p>Multimeters come in analog and digital forms. One of the nice features of digital multimeters is that they\u2019re auto-ranging<strong>, <\/strong>meaning the multimeter automatically selects the correct measurement range for the quantity you&#8217;re testing \u2014 voltage, current, or resistance \u2014 so you don\u2019t have to manually dial in an expected value range. That makes digital multimeters easier for beginners to use.<\/p>\n<p>The main components of a multimeter&nbsp;(whether digital or analog) include:<\/p>\n<ul>\n<li><strong>Display<\/strong>: Shows the measured value.<\/li>\n<li><strong>Dial<\/strong>: Lets you select what to measure (voltage, current, resistance).<\/li>\n<li><strong>Ports<\/strong>: COM (black) and two red ports: one for voltage, resistance, and milliamp\/\u03bcA measurements, and one for high current (up to 10A). Most pro multimeters separate the ports for measuring voltage\/resistance and milliamp\/\u03bcA. There will be a port you use when you\u2019re measuring voltage and resistance measurements. Never plug into the 10A jack unless you&#8217;re measuring large currents.<\/li>\n<li><strong>Probes<\/strong>: Black (negative) and red (positive) wires to connect to test points.<\/li>\n<\/ul>\n<h2 id=\"h.al0xtwzh6ifm\"><span style=\"text-decoration: underline;\">Real-World Applications<\/span><\/h2>\n<p>&nbsp;<\/p>\n<h3 id=\"h.dizat98j23wy\">Testing Batteries (Voltage)<\/h3>\n<p>You can use a multimeter to test if your batteries still have juice.&nbsp;Here\u2019s how to do it:<\/p>\n<p>Plug the black probe into &#8220;COM&#8221; and red probe into the milliamp\/\u03bcA port.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-189753\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo.jpg\" alt=\"Close-up of a digital multimeter dial showing various measurement settings\u2014ideal for a multimeter tutorial on how to use a multimeter to test voltage, current, resistance, continuity, frequency, and non-contact voltage detection.\" width=\"600\" height=\"392\" srcset=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo.jpg 600w, https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo-320x209.jpg 320w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Turn the dial to AC voltage (~ V).<\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image8-1.jpg\" alt=\"Image8\" width=\"605\" height=\"454\"\/><\/figure>\n<p>Touch red probe to battery&#8217;s positive terminal, black to negative.<\/p>\n<p>Read the display \u2014 AA\/AAA should be around 1.5V, 9V around 9V, car batteries 12.6V when charged.<\/p>\n<h3 id=\"h.dizat98j23wy\">Testing for Parasitic Draw (Current)<\/h3>\n<p>A few years ago,&nbsp;my car&nbsp;wouldn&#8217;t start in the mornings. Once I jumped the battery, it was fine. The battery was good. But then a few days later, the car wouldn\u2019t start again. I made sure I wasn\u2019t leaving dome lights on or anything.<\/p>\n<p>I ended up taking it to a mechanic, and he used a multimeter to discover a parasitic draw from a wireless phone adapter plugged into the cigarette lighter. Here\u2019s how I could have used my multimeter to diagnose this on my own:<\/p>\n<p><strong>1. Set Up Your Meter<\/strong><\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image9.jpg\" alt=\"Image9\" width=\"600\" height=\"356\"\/><\/figure>\n<ul>\n<li>Turn the dial to DC Amps (A\u2393 or mA\u2393).<\/li>\n<li>Plug the black lead into COM.<\/li>\n<li>Plug the red lead into the mA jack.<\/li>\n<\/ul>\n<p><strong>2. Break the Circuit at the Negative Terminal<\/strong><\/p>\n<p>Use a wrench to loosen and remove the negative battery cable from the battery post.<\/p>\n<p><strong>3. Connect the Meter in Series<\/strong><\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image1-1.jpg\" alt=\"Image1\" width=\"605\" height=\"454\"\/><\/figure>\n<p>You&#8217;re going to place the meter&nbsp;in series<strong>,<\/strong> which means you&#8217;re connecting it directly into the path of the electrical current. Instead of electricity flowing directly from the battery to the cable, it now flows through the meter first, then continues to the cable. Because the meter and cable form a single continuous path (like links in a chain), they&#8217;re said to be connected &#8220;in series.&#8221; This setup lets the meter measure all the electricity moving through that pathway.<\/p>\n<p>It&#8217;s hard to see what I&#8217;m doing in this pic, but it&#8217;s this:<\/p>\n<ul>\n<li>Touch the black probe to the negative battery post.<\/li>\n<li>Touch the red probe to the loose battery cable.<\/li>\n<li>You\u2019ve now inserted the multimeter in series and the battery current is flowing through your meter.<\/li>\n<\/ul>\n<p><strong>4. Read the Display<\/strong><\/p>\n<ul>\n<li>A normal reading is typically 20\u201380 milliamps (0.02\u20130.08A).<\/li>\n<li>Anything above 100mA (0.1A)&nbsp;is excessive and warrants investigation.<\/li>\n<\/ul>\n<p><strong>5. Track the Culprit<\/strong><\/p>\n<p>If the meter reads above 100mA:<\/p>\n<ul>\n<li>Have another person start pulling fuses one at a time&nbsp;from&nbsp;the fuse box.<\/li>\n<li>Watch the current draw after each one.<\/li>\n<li>When the draw drops significantly, you\u2019ve found the circuit responsible. From there, trace what\u2019s connected to it.<\/li>\n<\/ul>\n<h3><strong>Testing Extension Cords (Resistance\/Continuity)<\/strong><\/h3>\n<p>Extension cords take a beating. Over time, the insulation can crack, wires can loosen, and corrosion can creep into the connections.<\/p>\n<p>A damaged extension cord is a fire or shock waiting to happen. Fortunately, your multimeter makes it easy to test cords and catch problems before they become dangerous.<\/p>\n<h4 id=\"h.b1rdpxxthcx1\"><span style=\"text-decoration: underline;\"><strong>Step 1: Check for Continuity and Shorts<\/strong><\/span><\/h4>\n<p>Start with the cord completely unplugged.<\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image4-1.jpg\" alt=\"Image4\" width=\"600\" height=\"426\"\/><\/figure>\n<p>Set your multimeter to resistance (\u03a9) or continuity mode. Plug the red probe into the voltage\/resistance port.<\/p>\n<p><em>To test each wire:<\/em><\/p>\n<p><strong>Ground:<\/strong><\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image3-1.jpg\" alt=\"Image3\" width=\"599\" height=\"615\"\/><\/figure>\n<ul>\n<li>Insert the red probe into the round ground hole on the female (plug-in) end.<\/li>\n<li>Touch the black probe to the round ground prong on the male (wall plug) end.<\/li>\n<li>Expect a reading under a few ohms depending on cord length and gauge. Anything over ~5 ohms could indicate corrosion or a partial break.<\/li>\n<\/ul>\n<p><em>Now check for shorts:<\/em><\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image5-1.jpg\" alt=\"Image5\" width=\"600\" height=\"512\"\/><\/figure>\n<ul>\n<li>Keep the red probe in the ground hole and touch the black probe to each flat prong on the male end.<\/li>\n<li>Your multimeter should display \u201cO.L.\u201d or infinity,&nbsp;indicating no connection. If you get a low reading, the cord has a short and should be tossed.<\/li>\n<\/ul>\n<p><strong>Hot and Neutral Slots:<\/strong><\/p>\n<p>Repeat the same procedure for the short (hot) slot and long (neutral) slot:<\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image6-1.jpg\" alt=\"Image6\" width=\"601\" height=\"327\"\/><\/figure>\n<ul>\n<li>Match each slot to its corresponding prong and test for continuity (0.8 ohms or less).<\/li>\n<li>Cross-test against the other prongs for \u201cO.L.\u201d&nbsp;readings to confirm there are no shorts between wires.<\/li>\n<\/ul>\n<p>If any test shows continuity between circuits that shouldn\u2019t be connected, that cord goes in the trash. It\u2019s not worth trying to repair.<\/p>\n<h4 id=\"h.ioqcqifep6lq\"><span style=\"text-decoration: underline;\"><strong>Step 2: Test for Live Voltage<\/strong><\/span><\/h4>\n<p>Once you\u2019ve confirmed the cord isn\u2019t damaged, you can check that it\u2019s delivering voltage properly.<\/p>\n<p>Plug the cord into a live wall outlet.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-189753\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo.jpg\" alt=\"Close-up of a digital multimeter dial showing various measurement settings\u2014ideal for a multimeter tutorial on how to use a multimeter to test voltage, current, resistance, continuity, frequency, and non-contact voltage detection.\" width=\"600\" height=\"392\" srcset=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo.jpg 600w, https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/vo-320x209.jpg 320w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Set your multimeter to AC voltage (VAC).<\/p>\n<figure style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/image7-1.jpg\" alt=\"Image7\" width=\"602\" height=\"337\"\/><\/figure>\n<p>Insert the probes into the two female holes of the cord. You should get around 120 volts.<\/p>\n<p>Move one of the probes to the ground hole (it\u2019s round). You should again see ~120 volts.<\/p>\n<p>These readings confirm the cord is carrying voltage properly and safely.<\/p>\n<p>There you go. How to use a multimeter. Whether you&#8217;re checking batteries, hunting down mysterious electrical problems in your vehicle, or making sure your extension cords aren&#8217;t fire hazards waiting to happen, this simple tool can save you time, money, and headaches.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A multimeter is invaluable for the DIY troubleshooting of electrical problems around the house. You can use it to identify faulty wiring, check if electrical sockets have power, and test batteries. My electrical engineer brother-in-law, Ryan Davis, recently showed me how to use one. Here\u2019s a write-up of what I learned. Maybe you\u2019ll find it [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":189765,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"","activitypub_status":"federated","footnotes":""},"categories":[42261,42259],"tags":[],"class_list":["post-189752","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manly-know-how","category-skills"],"featured_image_urls":{"large":"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-blank-538x280.jpg","aom":"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-blank-372x230.jpg","reactor-320":"https:\/\/content.artofmanliness.com\/uploads\/2025\/05\/multimeter-blank-320x197.jpg"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Use a Multimeter | The Art of Manliness<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.artofmanliness.com\/skills\/manly-know-how\/multimeter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use a Multimeter | The Art of Manliness\" \/>\n<meta property=\"og:description\" content=\"A multimeter is invaluable for the DIY troubleshooting of electrical problems around the house. 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