How to measure whether piezoelectric ceramics are damaged with a multimeter
A multimeter consists of three main parts: meter head, measurement circuit and transfer switch. The multimeter is the most basic tool in the field of electronic testing and is also a widely used testing instrument. Multimeters are also called multimeters, three-purpose meters (A, V, Ω, that is, current, voltage, and resistance), multiplex meters, and multimeters. Multimeters are divided into pointer multimeters and digital multimeters. There is also an oscilloscope function. An oscilloscope multimeter is a multi-functional, multi-range measuring instrument.
Generally, multimeters can measure DC current, DC voltage, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance, temperature and some parameters of semiconductors (diodes, transistors). Digital multimeters have become mainstream and have replaced analog meters. Compared with analog instruments, digital instruments have high sensitivity, high accuracy, clear display, strong overload capacity, easy to carry, and are more convenient and simple to use. Let the editor of Electrician Home introduce to you how to use a multimeter to determine whether piezoelectric ceramics are damaged.
Piezoelectric ceramic is a synthetic piezoelectric material. When subjected to external pressure, charges will be generated on both sides, and the amount of charge is proportional to the pressure. This phenomenon is called the piezoelectric effect. Piezoelectric ceramics have a piezoelectric effect, that is, they will deform under the action of an external electric field, so piezoelectric ceramic sheets can be used as sound-generating components.
Using the piezoelectric effect of the piezoelectric ceramic piece, a multimeter can be used to judge its quality.
Lead two wires from the two poles of the piezoelectric ceramic piece, then place the ceramic piece flat on the table, connect the two leads to the two test leads of the multimeter, set the multimeter to the minimum current block, and then lightly press the ceramic piece with the pencil eraser. , if the multimeter pointer swings obviously, it means the ceramic piece is intact, otherwise, it means it is damaged.
