What is the detection method of piezoelectric ceramic buzzer? Piezoelectric ceramic buzzer is a kind of device used in piezoelectric ceramic chip. Titanium and piezoelectric ceramic sheets (PZT) made of zirconium and lead oxides are commonly sintered. In order to improve the low-frequency response, double diaphragm structure is generally used. Piezoelectric ceramic buzzer is widely used and matched in electronic clocks and watches, car horns, sound, communication, remote sensing, calculators, electronic toys and other products.

The method to test the quality of piezoelectric ceramic buzzer with mechanical multimeter is as follows:
Turn the multimeter to 2.5V, and gently pinch both sides of the buzzer with the left thumb and index finger. Hold two pens in your right hand, the red pen is connected to the metal sheet, and the black pen is placed horizontally on the surface of the buzzer sheet.
Then press the left thumb and index finger slightly, and then relax. Two voltage signals with opposite polarity are successively generated on the buzzer, making the pointer swing to the right → return to zero → swing to the left → return to zero, with a swing of about 0.1 ~ 0.15v.
If the test is repeated after changing the position of the probe, the order of pointer swing is as follows:
Swing left → return to zero → swing right → return to zero. Under the same pressure, the greater the pointer swing, the higher the sensitivity of the buzzer.
If the pointer does not move, it indicates that there is leakage or damage inside the buzzer. The capacitance of the buzzer can be directly measured with a digital capacitance meter, and its capacitance shall be within the range of 0.005 ~ 0.02 Λ F.