{
  "schemaVersion": "1.0",
  "id": "https://elect-learn.org/en/lesson/03-multimeter-basics/",
  "url": "https://elect-learn.org/en/lesson/03-multimeter-basics/",
  "markdownUrl": "https://elect-learn.org/en/lesson/03-multimeter-basics/index.md",
  "jsonUrl": "https://elect-learn.org/en/lesson/03-multimeter-basics/index.json",
  "language": "en",
  "title": "Multimeter Basics",
  "description": "Use a dead receptacle case to understand voltage, continuity, and resistance measurements and their limits.",
  "kind": "lesson",
  "safetyNotice": "Learning reference only: electrical codes, permits, inspection bodies, and licensing rules differ by region. This course is not a substitute for local code, licensed training, permits, or authority requirements. Before any hands-on work, de-energize, verify absence of voltage, and follow local regulators/AHJ and employer procedures.",
  "sections": [
    {
      "id": "meter-references",
      "heading": "Read the mode before the number",
      "paragraphs": [
        "The same number means different things in volts, ohms or a continuity test. Use the symbol reference to name the selected function, then explain what the reading can and cannot establish."
      ],
      "links": [
        {
          "title": "Multimeter symbols, modes and readings",
          "url": "https://elect-learn.org/en/guides/multimeter-symbols/"
        }
      ]
    },
    {
      "id": "section-1",
      "heading": "Lesson information",
      "paragraphs": [
        "Safety and Tools · Basic · 22 min",
        "Tool",
        "Interactive"
      ]
    },
    {
      "id": "section-2",
      "heading": "Choose the question before reading the number.",
      "paragraphs": [
        "Decide what to measure before choosing a function and connection. Voltage and continuity answer different questions."
      ],
      "items": [
        "Voltage compares potential at two test points.",
        "Continuity is tested only on an isolated, de-energized specimen.",
        "Record the unit, function, and test points with the reading."
      ]
    },
    {
      "id": "section-3",
      "heading": "Goals",
      "items": [
        "Recognize meter jacks, dial positions, and probes.",
        "Know when to measure voltage and when to measure continuity.",
        "Avoid using resistance or continuity mode on energized circuits."
      ]
    },
    {
      "id": "section-4",
      "heading": "A dead receptacle: where is the break?",
      "paragraphs": [
        "A kitchen appliance does not work in one receptacle but works elsewhere.",
        "Wrong call: Immediately deciding the receptacle is bad and replacing it.",
        "Stop point: Confirm circuit status first; do not open energized parts.",
        "Reasoning path: Check GFCI/breaker state, measure hot-neutral and hot-ground voltage; use continuity only after de-energizing.",
        "Review: Exams often distinguish measurement purpose, meter mode, and energized vs de-energized testing boundaries."
      ]
    },
    {
      "id": "section-5",
      "heading": "Core concepts",
      "items": [
        "Voltage is measured in parallel, across two points.",
        "Continuity/resistance uses the meter's internal battery and must be used only on de-energized circuits.",
        "Readings must be interpreted with symptoms, not as isolated numbers."
      ]
    },
    {
      "id": "tool-multimeter",
      "heading": "Digital Multimeter",
      "paragraphs": [
        "Measures voltage, continuity, and resistance so you verify instead of guess.",
        "Misuse and limits: Wrong jack or mode selection can damage the meter or create danger."
      ]
    },
    {
      "id": "tool-tester",
      "heading": "Non-contact Voltage Tester",
      "paragraphs": [
        "Quickly screens for possible voltage as an early warning.",
        "Misuse and limits: It is not proof of absence of voltage by itself; confirm with a suitable meter."
      ]
    },
    {
      "id": "section-8",
      "heading": "Common Pitfalls",
      "items": [
        "Leaving a probe in the current jack while measuring voltage.",
        "Using continuity mode on a possibly energized receptacle.",
        "Testing only hot-neutral and missing clues from hot-ground."
      ]
    },
    {
      "id": "section-9",
      "heading": "Safe Workflow",
      "items": [
        "Inspect probes, case, and mode first.",
        "Use live-dead-live to confirm the meter works.",
        "Measure voltage when energized; measure continuity only after de-energizing and verifying."
      ],
      "ordered": true
    },
    {
      "id": "quiz-1",
      "heading": "Can continuity mode be used on an energized circuit?",
      "paragraphs": [
        "No. Use it only after de-energizing and verifying absence of voltage."
      ]
    },
    {
      "id": "quiz-2",
      "heading": "Are voltage probes placed in series or parallel?",
      "paragraphs": [
        "Parallel, across the two measurement points."
      ]
    },
    {
      "id": "section-12",
      "heading": "Look Back",
      "links": [
        {
          "title": "Review Lesson 1: a breaker is not personal shock protection.",
          "url": "https://elect-learn.org/en/lesson/01-why-electricity-is-dangerous/"
        },
        {
          "title": "Review Lesson 2: live-dead-live verification.",
          "url": "https://elect-learn.org/en/lesson/02-deenergize-test-lockout/"
        }
      ]
    }
  ],
  "dateModified": "2026-10-23",
  "publisher": {
    "name": "Elect Learn",
    "url": "https://elect-learn.org"
  },
  "review": {
    "status": "not-independently-reviewed",
    "statement": "No independent professional review is recorded. Cited sources do not imply review or endorsement by those organizations.",
    "policyUrl": "https://elect-learn.org/en/methodology/"
  }
}