Multimeter functions; How to use multimeter

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📏 Multimeter Basics

A multimeter is an essential tool for every electrical and electronics professional. It allows you to measure key parameters like:



  • Voltage (AC/DC)

  • Current (AC/DC)

  • Resistance (Ω)

  • Continuity / Diode testing

  • Sometimes frequency & capacitance (in advanced models)

⚡ Multimeter Terminals (Bottom Ports)

A typical digital multimeter (DMM) has three measuring points at the bottom:



  1. COM (Common, usually black)

    • Always connect the black probe here.

    • Acts as the reference/ground for all measurements.

  2. VΩmA (Voltage, Resistance, and milliampere input, usually red)

    • Use this port when measuring:

      • Voltage (AC/DC)

      • Resistance (Ω)

      • Current in milliamps (mA)

    • Safe for small current measurements (typically up to 200mA or 500mA depending on model).

  3. 10A (High Current Input, usually red)

    • Special terminal for high current measurement (up to 10A DC or AC).

    • Use this ONLY when measuring high current, otherwise it may damage the meter.

🔧 Correct Probe Connections

  • For Voltage / Resistance / mA:

    • Black probe → COM

    • Red probe → VΩmA

  • For High Current (up to 10A):

    • Black probe → COM

    • Red probe → 10A

⚠️ Important Note:

  • If current >10A is applied, the fuse/meter may get damaged.

  • Always start with the highest range and then move down gradually to avoid overloading the meter.

✅ Practical Tips

  • Never keep the red probe in the 10A socket when measuring voltage – it can blow the fuse.

  • Always set the dial to the correct measurement type (AC, DC, Resistance, etc.) before testing.

  • Double-check probe placement before connecting to a circuit.


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