The earth continuity test passes a test current along the earth cable from the pin of the plug to the contact point on the appliance. The appliance tester then measures the resistance of that connection. If the earth connection is damaged, non-existent or corroded then the earth resistance reading will increase.
How do I test earth continuity with a multimeter?
How to Test for Continuity with a Digital Multimeter
- First insert the black test lead into the COM jack.
- Then insert the red lead into the VΩ jack. ...
- With the circuit de-energized, connect the test leads across the component being tested. ...
- The digital multimeter (DMM) beeps if a complete path (continuity) is detected.
How is continuity test performed?
A continuity test is performed by placing a small voltage (wired in series with an LED or noise-producing component such as a piezoelectric speaker) across the chosen path. If electron flow is inhibited by broken conductors, damaged components, or excessive resistance, the circuit is "open".
