Simple and quick way to find equipment leakage - Database & Sql Blog Articles

Probe domestic switch needle KG-300K, needle head diameter is 3.0mm, normally open switch needle

100V, 250mA, surface mount, high-speed switching diode

SMD aluminum electrolytic capacitor

1206RGB (single)

First, use a multimeter to check for leakage voltage. Set the multimeter to the AC voltage mode, typically at 250V. Insert the black probe into the ground near the device under test, and connect the red probe to the metal casing of the device. Observe the multimeter's display. If the needle doesn't move, gradually switch to lower voltage ranges until you get an accurate reading. If no reading appears even at the lowest setting, it means there is no leakage in the device.

Second, use a neon tester to detect leakage. Hold the tester against the metal casing of the electrical equipment. If the neon light inside the tester lights up, it indicates that the device has a leakage and the voltage is relatively high. However, if the light doesn’t glow, it doesn’t necessarily mean there is no leakage. It could be that the leakage voltage is low, or the tester isn’t sensitive enough to detect it.

Third, if you don’t have a multimeter or a neon tester, you can touch the metal casing with your back. If you feel a tingling sensation or a mild electric shock, it suggests that the device has a leakage voltage. Be cautious if you feel any shock, as it may indicate a higher voltage. In such cases, stop the inspection immediately, identify the cause, and fix the issue before using the device again. Otherwise, there’s a risk of electric shock.