{"id":14308,"date":"2025-02-28T18:38:00","date_gmt":"2025-03-01T02:38:00","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=14308"},"modified":"2026-07-14T10:54:09","modified_gmt":"2026-07-14T17:54:09","slug":"your-guide-to-multimeters-how-they-work","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/your-guide-to-multimeters-how-they-work\/","title":{"rendered":"Your guide to multimeters &#038; how they work"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Discover how to use a multimeter&#8217;s functions to test voltage, current, resistance and more for DIY appliance repairs.<\/p>\n","protected":false},"author":3,"featured_media":14585,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Multimeter functions and how they work","_yoast_wpseo_title":"%%title%% %%page%%","_yoast_wpseo_metadesc":"Discover how to use a multimeter's functions to test voltage, current, resistance and more for DIY appliance repairs.","_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/02\/Updated-blog-rectangle-1-2-1500x430.jpg' attachment='14584' attachment_size='featured' copyright='' caption='' styling='' align='center' font_size='' overlay_opacity='0.4' overlay_color='#000000' overlay_text_color='#ffffff' animation='no-animation' hover='' appearance='' link='' target='' title_attr='' alt_attr='' lazy_loading='disabled' id='' custom_class='' av_element_hidden_in_editor='0' av_uid='av-146y2is' admin_preview_bg=''][\/av_image]\r\n\r\n[av_textblock size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' color='' id='' custom_class='' av_uid='av-m79czw1h' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">If you\u2019ve ever found yourself staring at a multimeter, unsure of what all those buttons, dials, and symbols mean, you're not alone. Whether you're a seasoned DIYer or a total beginner, understanding the different functions of a multimeter is important for quickly determining what\u2019s going wrong with your appliances.\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">But we\u2019ve got you covered! Let\u2019s break down the key features of a multimeter so you can use them like a pro! And if you have any questions, don\u2019t hesitate to ask us. <\/span><span style=\"font-weight: 400;\">If you find out that you need any replacement parts for your appliances<\/span> <span style=\"font-weight: 400;\">while you\u2019re troubleshooting, you can enter your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><b>model number<\/b><\/a> <span style=\"font-weight: 400;\">at<\/span> <a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\"> to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.<\/span>\r\n\r\n[lwptoc numeration=\"romannested\"]\r\n<p style=\"font-size:14.5px;margin:14px 0;font-family:system-ui,-apple-system,sans-serif\"><a href=\"#app-safety-notes\">Full safety notes below<\/a><\/p>\n\n<h2><strong>What is a multimeter?<\/strong><\/h2>\r\n<span style=\"font-weight: 400;\">A multimeter is a tool that allows you to measure electrical values like voltage, current, and resistance. It\u2019s very useful for DIY repairs since it can show if there\u2019s a problem with your appliances or electrical systems. You can use a multimeter to test different appliance parts to pinpoint exactly what's wrong.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">You can also use a multimeter to check batteries, diagnose issues in household wiring, and more. Multimeters have different settings for different tests, so you'll need to know which one to use depending on what you're checking.<\/span>\r\n<h2><strong>What\u2019s on a multimeter display?<\/strong><\/h2>\r\n<span style=\"font-weight: 400;\">When you first look at a multimeter, you\u2019ll see a display section that shows the measurements. If you\u2019re using a digital multimeter, it\u2019ll show numbers and units. If you have an analog multimeter, you'll see a needle pointing to different values.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Here\u2019s what you\u2019ll see and what it means:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Voltage, current &amp; resistance: <\/b><span style=\"font-weight: 400;\">The numbers you see on the display will tell you the value of what you\u2019re testing, and the units will show whether it\u2019s volts (V), amperes (A), or ohms (\u03a9).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Current symbols:<\/b><span style=\"font-weight: 400;\"> The display may also include symbols like a straight line for DC (direct current) and a wavy line for AC (alternating current) so you know what type of signal you\u2019re measuring<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Other readings:<\/b><span style=\"font-weight: 400;\"> If you're testing things such as a diode or continuity, then the display will show relevant information to confirm if the part is working or if there's a problem.<\/span><\/li>\r\n<\/ul>\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-use-a-multimeter-to-check-appliance-parts\/\"><b>How To Use A Multimeter To Check Appliance Parts<\/b><\/a>\r\n<h2><strong>Multimeter functions &amp; what they\u2019re used for<\/strong><\/h2>\r\n<span style=\"font-weight: 400;\">There are several tests you can perform with a multimeter. Here\u2019s what you should know about them.<\/span>\r\n<h3><strong>Voltage (V) testing<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">AC voltage (alternating current) is what powers most household appliances. When you set your multimeter to AC voltage (usually indicated by a \u201cV~\u201d), you can check things like wall receptacles, power cords and the voltage intake of the appliance itself.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">DC voltage (direct current) is found in things like batteries, motors and small electronics. You\u2019ll have to set your multimeter to DC voltage (usually indicated by a \u201cV\u2014\u201d) when you're testing those items.<\/span>\r\n\r\n<b><i>Important: <\/i><\/b><i><span style=\"font-weight: 400;\">You should always start with the highest voltage setting to avoid damaging the meter and be sure to safely place the probes on the correct contacts (red probe to positive, black probe to negative).<\/span><\/i>\r\n<h3><strong>Current (A) testing<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">Current measurement lets you test how much electricity is flowing through a wire or part. This function is usually reserved for more advanced repairs.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">To measure current, you\u2019ll need to break the circuit open so the multimeter can be placed in series with the device. This means that the current would be forced to flow through the multimeter.<\/span>\r\n\r\n<b><i>Important: <\/i><\/b><i><span style=\"font-weight: 400;\">Always set the multimeter to the correct range for amperage and never try to measure current without disconnecting power first as it could damage the meter or cause serious injuries.\u00a0<\/span><\/i>\r\n<h3><strong>Resistance (\u03a9) testing<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">Resistance testing is useful for checking whether a part like a resistor, wire, or fuse is still good. A higher resistance typically means the part isn\u2019t conducting electricity properly.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">To test, you\u2019ll set your multimeter to resistance mode (\u03a9 symbol), and connect the probes across the part you\u2019re testing.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If the reading shows zero or close to zero, then the part is likely shorted (bad). If the meter shows a very high number or infinite resistance, then the part could be broken or disconnected.<\/span>\r\n<h3><strong>Continuity testing<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">Continuity testing helps you identify whether there\u2019s an electrical path or break in a circuit. It\u2019s a quick way to find faulty wires or connections.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">In continuity mode, your multimeter will usually make a beeping sound if the circuit is complete (i.e., the wire or part isn\u2019t broken). No beep means there\u2019s an open circuit or a break in the wire or part.<\/span>\r\n<h3><strong>Diode testing<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">When testing diodes, your multimeter will check if the diode is allowing current to flow in one direction and blocking it in the other.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">To perform this test, you\u2019ll set your multimeter to the diode test function ( marked with a diode symbol), and place the probes on the diode.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">The multimeter should show a voltage drop (typically 0.7V for silicon diodes) in one direction, and no reading in the opposite direction. If it doesn\u2019t behave like that, then the diode is faulty.<\/span>\r\n\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/basic-tool-maintenance\/\"><b>Tool Maintenance 101: The Basics You Need To Know<\/b><\/a>\r\n<h2><strong>Common situations for multimeter testing<\/strong><\/h2>\r\n<span style=\"font-weight: 400;\">Now that you're more familiar with how to use a multimeter, let\u2019s dive into some common DIY repairs where it\u2019ll come in handy.<\/span>\r\n<h3><strong>Check batteries and power supplies<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">One of the simplest uses for a multimeter is testing batteries to see if they\u2019re good or if they should be replaced.<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set your multimeter to DC voltage mode (V\u2014) and place the probes on the battery terminals.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the meter reading. A good 1.5V battery should read about 1.5 volts, and a 9V battery should read close to 9 volts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If you\u2019re testing a power supply, check the output voltage to make sure it matches the required specifications.<\/span><\/li>\r\n<\/ol>\r\n<h3><strong>Troubleshoot electrical systems in household appliances<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">If an appliance such as a dryer or dishwasher isn\u2019t working, a multimeter can help you figure out where the issue lies. You can use it to check the power supply, internal wiring, and individual parts like thermostats or switches.<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Test the power input to the appliance. If there\u2019s no voltage where it should be, then you\u2019ll need to check the power cord, fuse, or circuit breaker.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If power is coming through, use the continuity mode to check individual parts like switches, motors, or heating elements. A lack of continuity in any of these parts means they\u2019re faulty and need to be replaced.<\/span><\/li>\r\n<\/ol>\r\n<h3><strong>Test fuses, wires, and switches<\/strong><\/h3>\r\n<span style=\"font-weight: 400;\">You can use a multimeter to check the condition of fuses, wiring, and switches.<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use the continuity setting to test fuses. If the multimeter beeps, the fuse is good; if it doesn\u2019t beep, it\u2019s blown and needs to be replaced.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You can check if switches are functioning properly by measuring the continuity when they\u2019re turned on and off.<\/span><\/li>\r\n<\/ol>\r\n<b><i>Important:<\/i><\/b><i><span style=\"font-weight: 400;\"> When testing wires, use continuity mode to make sure there are no breaks or shorts. This is especially useful if you suspect a wire is damaged but can\u2019t see it.<\/span><\/i>\r\n\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/diy-for-beginners-the-tools-you-need-for-appliance-repair\/\"><b>Must-Have Tools for Appliance Repair \u2013 DIY For Beginners<\/b><\/a>\r\n<h2><strong>More help is here<\/strong><\/h2>\r\n<span style=\"font-weight: 400;\">Thanks for reading! We hope this guide helped you learn more about multimeters! If you need some replacement parts or help with troubleshooting, grab your model number and head over to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\">. We have over two million parts in stock and most orders arrive in just two business days. If you need some help with finding the right part or placing an order, you can contact our team at 1 (877) 477-7278.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">While you\u2019re waiting for your new part to arrive, you can explore our <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/\"><b>DIY blog<\/b><\/a><span style=\"font-weight: 400;\"> and watch thousands of video tutorials on <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>our YouTube channel<\/b><\/a><span style=\"font-weight: 400;\">.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Follow us on <\/span><a href=\"http:\/\/facebook.com\/appliancepartspros\"><b>Facebook<\/b><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/twitter.com\/applpartspros\"><b>Twitter<\/b><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/instagram.com\/appliancepartspros?igshid=OGQ5ZDc2ODk2ZA==\"><b>Instagram<\/b><\/a><span style=\"font-weight: 400;\"> to see our latest repair guides!<\/span>\n\n<div id=\"app-safety-notes\" style=\"border:1px solid #E6E6E6;border-radius:8px;overflow:hidden;margin:22px 0;font-family:system-ui,-apple-system,sans-serif\"><div style=\"background:#1C437C;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\u26a1&nbsp;Electrical safety \u2014 before you start<\/div><ul style=\"margin:0;padding:14px 20px 14px 38px;font-size:15px;line-height:1.6;color:#1A1A1A;background:#fff\"><li style=\"margin:6px 0\"><b>Disconnect power<\/b> before you start \u2014 unplug it or switch off the breaker, and <b>confirm it's dead<\/b>.<\/li><li style=\"margin:6px 0\">Follow your <b>local electrical code<\/b>.<\/li><li style=\"margin:6px 0\">Anything involving <b>household wiring, outlets, or the breaker panel<\/b> itself is <b>licensed-electrician territory<\/b>.<\/li><\/ul><\/div>\n[\/av_textblock]\r\n\r\n[av_social_share title='Share this entry' buttons='' share_facebook='' share_twitter='' share_whatsapp='' share_pinterest='' share_reddit='' share_linkedin='' share_tumblr='' share_vk='' share_mail='' share_yelp='' yelp_link='https:\/\/www.yelp.com' style='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' alb_description='' id='' custom_class='' av_uid='av-m8fgpw']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[495],"tags":[4984,269,4982,4985,4986,4987,4983],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Your guide to multimeters &amp; 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