Test with a multimeter

Active buzzer

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Now: Short circuit check: + to −

5 V CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Plus (+) 1 + Minus (−) 2 −
Pin 1: Plus (+) (+) Pin 2: Minus (−) (−)

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 continuity.

Test setup: Setup: it powers the buzzer with 5 V; the multimeter is in series to measure current. Press the “Power on” button and current flows. To really check it is good, also listen for it to sound: the multimeter only shows current.

Measure step by step

An active buzzer has its own oscillator inside. A multimeter cannot hear sound; because of the internal electronics, the Ω range cannot say good or bad on its own, it only shows a short circuit. For the real decision, power the buzzer in the setup and look at the current it draws.

A buzzer has polarity: connect the plus (+) to the red probe side. Power it only at its rated voltage.

  1. 1Short-circuit check: + and −
  2. 2Voltage when powered
  3. 3Current drawn when powered