Multimeter Parts Explained In Detail [PDF]

In this article, we’ll explore the components of a multimeter, a vital tool for technicians and electricians in the electronics industry. Also known as a multitester or VOM, it measures essential electrical parameters like voltage, current, and resistance. Some models can additionally gauge characteristics like continuity, frequency, and capacitance.

What is a Multimeter?

A multimeter is a device that quickly determines the condition of a battery or tests the resistance of wires during project assembly. Technicians rely on multimeters to troubleshoot various electrical issues efficiently. It’s handy for identifying live pins in AC outlets and checking temperature limits on electronic boards. Additionally, multimeters ensure the continuity of coaxial cables.

What is a Multimeter?

Main Types of Multimeter

Multimeters come in two main types:

  • Analog Multimeter
  • Digital Multimeter

Analog models, use a needle pointer and are effective for applications with rapidly changing values. Digital multimeters display numeric values and are more commonly used due to their higher precision compared to analog counterparts.

Digital Multimeter
Analog Multimeter

Main Parts of Multimeter

Following are the 7 main parts or components of a multimeter:

  • Scale
  • Needle Pointer
  • Adjustment Screw
  • Zero-Ohm Adjustment Knob
  • Range Selector Knob
  • Ports
  • Test Probes
parts of multimeter

For this electronic measuring tool to function effectively, it requires several components to collaborate. These parts work together to measure the mentioned values. The multimeter includes a scale, needle or pointer, adjustment screw, zero-ohm selector, range selector knob, ports, and test probes. In the following sections, we’ll delve into each component, exploring their roles and functionalities.

Scale

Reading the measured value is straightforward. In an analog multitester, it involves interpreting markings in a semicircle. The device screen and scale section of your multimeter display various readings like voltage, current, and resistance, depending on its complexity. The measured value corresponds to the specific port you’ve plugged into on your analog multitester.

Needle Pointer

The needle pointer, connected to the moving coil, moves over the meter scale, indicating the measured value on the multitester. When multiple values share the same scale, ensure the multitester is connected to the relevant port matching the value you’re measuring.

Adjustment Screw

The dial or infinity knob lets you set the pointer to the scale’s zero position, often done with a flat head screwdriver. It’s worth noting that the term ‘infinity knob’ is derived from the concept that at 0 voltage, there’s ‘infinite resistance.’

Zero-Ohm Adjustment Knob

Use the zero-ohm adjustment knob to calibrate the multitester for resistance measurements. Connect the probes, set the needle to ‘0 ohms,’ and adjust if needed for accurate calibration.

Range Selector Knob

The range selector knob, also called a selector switch, adjusts multitester settings for measuring voltage, current, or resistance. It can be auto-ranging, where you select the symbol for the parameter and obtain the measurement, or manual ranging, requiring you to set the dial higher than your circuit’s maximum value for precision.

Ports

The front holes on the multimeter are called ports. Plug your test probes into the relevant ports to enable measurement of your desired parameter.

Test Probes

Test probes connect a multimeter to the Device Under Test (DUT). They are insulated wires ensuring safety. Red probes connect to the positive terminal, black to the negative. The best test leads are well-insulated, sturdy, and affordable, suitable for simple handheld multimeters.

What is the Range of Multimeter?

Multimeters commonly measure voltage, current, and resistance. Some have a continuity check with a beep to ensure electrical connection, handy for soldering or wire joining. This feature prevents short circuits by confirming no loose wires. Some models include a diode check, useful for testing diodes’ proper functioning and orientation in a circuit. Advanced multimeters can measure various components like transistors or capacitors, but this guide focuses on basic features. Refer to your multimeter’s manual for specific functions not covered here.

FAQ’s

What is the difference between a voltmeter and a multimeter?

A voltmeter exclusively measures voltage, whereas a multimeter can measure voltage, resistance, and current.

Is Ammeter a type of Multimeter?

An ammeter gauges the electric current in a circuit, whereas a multimeter offers additional capabilities, such as measuring voltage, current, and resistance.

What type of Multimeter do I need?

Choosing a multimeter depends on the application, considering factors like the parameters to be measured, ease of use, cost, and the manufacturer.

Conclusion

This article aimed to provide essential information about Multimeter Parts, also known as multitesters or VOMs. Multimeters are standard electronic instruments for measuring electrical parameters. We delivered a concise definition and thoroughly explained the seven main parts, discussing their structure, roles, and functions. Hope you found this article enjoyable.

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