Views: 3 Author: Site Editor Publish Time: 2019-07-30 Origin: Site
As for piezoelectric ceramic crystal, if they differ in diameter, then it will definitely affect its frequency. However, if the diameter is 10-25 mm, then the frequency is generally in the range of 15-85 kHz. At the same size, the piezoelectric ceramic plates have different amplitudes because the input frequency is consistent with its own frequency.
The voltage generated by the piezoelectric ceramic piece after being pressed is generally related to the pressure it receives and to the area of the piezoelectric ceramic piece. As for its measurement, you can use the digital multimeter's 20V DC voltage block to carry out and obtain specific values.
The positive and negative electrodes of the piezoelectric ceramic transducer are judged by a quasi-static d33 tester. However, it is necessary to know whether the positive electrode is measured upwards, whether it is positive or negative. Moreover, some piezo disks crystal sheets can be tested with this type of tester, which is also limited.
Two leads are drawn on the piezoelectric ceramic poles respectively, and then the wires are connected to the two test leads of the multimeter, and the current block of the multimeter is used. After that, using some insulating tools such as a pencil eraser, to lightly press the ceramic to see the direction of the pointer on the multimeter. If it is swung to the right, the end connected to the red pen is positive. Otherwise, The black pen is at the positive end.
Piezoelectric ceramic relays, in essence, are a type of relay and are also in the category of relays. Specifically speaking, the charging deformation of the piezoelectric ceramic is used to push the reed with the contact to generate the action, thereby achieving the intended purpose. Its main advantages are simple structure, low power consumption, and large internal impedance. Therefore, it can be used as a control element of a communication device.
