Multimeter measurement of piezoelectric ceramics to detect damage
A multimeter consists of three main parts: the meter head, the measurement circuit and the changeover switch. Multimeter is the most basic tool in the field of electronic testing and a widely used testing instrument. Multimeter is also known as multi-meter, triple meter (A, V, Ω that is, current, voltage, resistance, three), multiplexing meter, multimeter, multimeter is divided into pointer multimeter and digital multimeter, there is also an oscilloscope with oscilloscope function of the oscilloscope multimeter, is a kind of multifunctional, multi-range measurement instrument.
General multimeter can measure DC current, DC voltage, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance, temperature and semiconductor (diode, transistor) of some parameters. Digital multimeter has become the mainstream, has replaced the analogue meter. Compared with analogue meters, digital meters have high sensitivity, high accuracy, clear display, strong overload capacity, easy to carry, and more convenient and simple to use. Let the electrician's home editorial use of multimeter to determine whether the piezoelectric ceramic damage method to do for you to introduce it.
Piezoelectric ceramic is a synthetic piezoelectric material. When subjected to external pressure, the two sides will produce an electric charge, the charge is proportional to the pressure, this phenomenon is known as the piezoelectric effect. Piezoelectric ceramics have piezoelectric effect, that is, under the action of the external electric field, will produce deformation, so the piezoelectric ceramic sheet can be used as a sound generating element.
The use of piezoelectric ceramic piece of piezoelectric effect, available multimeter to determine its good or bad.
Piezoelectric ceramic piece of the two poles out of the two wires, and then put the ceramic piece of flat on the table, the two leads were connected to the multimeter two pens, the multimeter dialled to the minimum current block, and then use the pencil eraser head gently pressed the ceramic piece, if the multimeter pointer swings significantly, indicating that the ceramic piece of intact, or else, indicating that it has been damaged.
