How to Test a Diode Bridge with a Multimeter: Step-by-Step

A diode bridge (bridge rectifier) is a configuration of four diodes arranged to convert AC to DC. Testing a diode bridge ensures it is functioning correctly by verifying each diode’s conduction in the forward direction and blocking in reverse.

⚠ Important: To get accurate results, desolder or remove the bridge from the circuit, as other components can skew the readings.

1. Understanding the Diode Bridge

A four-diode bridge has:

1. Two AC input terminals (for the AC supply)
2. + output terminal
3. - output terminal

Each internal diode must be tested for forward conduction and reverse blocking.

Common Pinout (Reference)

$$\\text{ AC } \\leftrightarrow \\, \\text{~} \\\\$$