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Problem (Issue) Statement:

How to check earthing connection using a digital multimeter

Description:

A guideline to check earthing connection using a digital multimeter.

Earthing is commonly known to be very important, especially to electronics and circuit boards, and is designed to protect electrical wires and components from damage caused by sudden power surge.

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System Application:

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Symptom and Finding:

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Cause:

A guideline for checking earthing using digital multimeter.

Solution:

Summary:

To prepare a multimeter
To perform earthing test

Step-by-step Guide:

To prepare a multimeter:

Step 1: Ensure that the RED probe is connected to VΩma terminal while the BLACK probe is connected to COM terminal.
Connecting Red Probe to VmA and Black Probe to COM Terminals
Figure 1: Connecting red probe to VΩma and black probe to COM terminals

Step 2: Turn the dial to V measuring mode.
Turning the dial to V measuring mode
Figure 2: Turning the dial to V measuring mode

Step 3: Press SELECT to change the voltage mode to AC (Alternating Current)
Pressing SELECT to change voltage mode to measure AC voltage
Figure 3: Pressing SELECT to change voltage mode to measure AC voltage

Tip

title	Tip

The display screen will show the following symbol when the multimeter is in AC voltage mode.
Symbol Showing AC Mode in Multimeter Display
Figure 4: Symbol showing AC mode in multimeter display

To perform earthing test

Step 1: Touch the BLACK probe to the EARTH terminal and touch the RED probe to the NEUTRAL terminal on the switching mode power supply unit.
Neutral (white arrow) and Earth (red arrow) terminals
Figure 5: Neutral (white arrow) and Earth (red arrow) terminal (in that order)

Touching the Probes on the Correct Terminals
Figure 6: Touching the probes on the correct terminals

Step 2: Switch ON the power supply, and you will be able to read the voltage values displayed on screen.
Reading the Voltage Values
Figure 7: Reading the voltage values

Info

title	Note

Theoretically voltage difference between neutral and earth will be zero, but practically it will be between 2 to 4 AC volts. The closer you get to zero voltage, the better earthing you have provided to the system

Info

title	YouTube Reference Video

How to check earthing with multimeter

Common Issue

NIL

Date Documentation:

16/10/2018 (Rev 1.0)

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Versions Compared

Old Version 2

New Version 3

Key

Summary:

To prepare a multimeter

To perform earthing test

Step-by-step Guide:

To prepare a multimeter:

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