Test with a multimeter

Bridge diode

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Now: AC 1 → plus

CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ AC input 1 1 ~ AC input 2 2 ~ Positive output (+) 3 + Minus output (−) 4 −
Pin 1: AC input 1 (~) Pin 2: AC input 2 (~) Pin 3: Positive output (+) (+) Pin 4: Minus output (−) (−)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to diode test.

Measure step by step

A bridge rectifier has four diodes: from the two AC terminals to the positive terminal, and from the negative terminal to the two AC terminals. Measure the four diodes one by one, then see that the reverse direction reads OL between the AC terminals and at the output.

  1. 1AC 1 → plus
  2. 2AC 2 → plus
  3. 3Minus → AC 1
  4. 4Minus → AC 2
  5. 5Reverse direction: red on plus, black on the minus end
  6. 6Between the AC terminals