Tao Zhen
Tao Zhen
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Ceramic vibration is a common kind of electronic components, which is made of ceramics. It is famous for its small size, light weight and low energy consumption. It is widely used in television, computer, video recorder and other electronic equipment.
The scientific name of "ceramic resonator" is "piezoelectric ceramic resonator". It is an important electronic component, which is used to provide a fixed oscillation frequency for the circuit·
It works on the principle of piezoelectric effect of ceramic chip·
In the working process, electrical energy and mechanical energy change periodically·
This periodicity is very stable, ceramic crystal oscillator can not provide close to the crystal oscillator (quartz crystal oscillator) in ppm (PPM = 10 sixth power) expression accuracy, the highest accuracy can only be expressed in thousandth, but can provide a very stable oscillation frequency for the working circuit.
Common frequency points
Generally, 6.00mhz, 8.00mhz, 12.00mhz, 24.0mhz and other common frequency points are selected
test
1. Free drop (impact): free drop from 75cm height to 30mm thick hardwood, drop three times, frequency change in line with electrical performance requirements. 2. Vibration: frequency: 10 ~ 55Hz, amplitude: 1.5mm, vibration in X, y and Z directions for 60min. The frequency change meets the electrical performance requirements. 3. Tensile strength of lead out end: fix the ceramic vibration body, apply 1kg tensile force along the axial direction of the pin for 30 ± 5 seconds, and the pin does not pull out or break. Bending: 450g weight is suspended at the end of the pin, bending for 90 ° for 2 ~ 3 seconds, return to the original position at the same speed, and operate in the opposite direction once more, and the pin is not loose or broken. 4. Solderability: from the end of the pin to the bottom 2 ~ 2.5mm, put it into the 235 ℃± 5 ℃ welding groove, the time is 2 ± 0.5 seconds, and the tin surface is more than 90%. The requirement of performance test is the same as that of vibration test. 5. Resistance to welding heat: put it into 350 ℃± 10 ℃ welding groove 2 ~ 2.5mm from the end of the pin to the bottom for 3.5 ± 0.5 seconds. After the test, the appearance is normal, and the performance inspection is the same as the vibration requirements. 6. Constant damp heat: at 40 ± 3 ℃, Rh 90% ± 2%, placed for 100 hours, recovered for 1 hour after taking out, no abnormal appearance, and the performance test is the same as the vibration requirements.
Chinese PinYin : Tao Zhen
Tao Zhen
