What factors can cause damage to the crystal?

2024/07/23

1. There is a falling phenomenon in the production process, which means that only the crystal oscillator causes excessive external impact, because the crystal oscillator chip is relatively thin and needs to be handled with light.

2. When the crystal oscillator is welded to the circuit board, the welding temperature may be too high, resulting in poor crystal oscillator.

3. Virtual welding occurs during the welding process, that is, false welding, so that the crystal oscillator is not energized.

4. After the crystal is welded, the solder is connected to the line, causing a short circuit.

5. In the leak detection process, the quartz crystal resonator is prone to the phenomenon of touching the shell under the pressure of alcohol, that is, the chip and the shell are prone to touch each other when vibrating, so that the crystal is prone to no vibration or stop vibration when vibrating;

In the pressure seal, the crystal internal requirements of vacuum filling nitrogen, if the pressure seal is not good, that is, the crystal sealing is not good, under the condition of alcohol pressure, its performance is leakage, called double leakage, will also lead to stop vibration.

6. High frequency crystal oscillator, because the thickness of the chip itself is very thin, when the excitation power is too large, the internal quartz chip will be damaged, resulting in vibration stop;

7, functional load will reduce the Q value (I. e. quality factor), so that the stability of the crystal decreased, easily affected by the surrounding active components, in an unstable state, when the vibration is not vibration phenomenon;

8. Because the crystal is prone to mechanical stress and thermal stress when cutting feet and soldering, and the soldering temperature is too high and the action time is too long will affect the crystal, which will easily lead to the crystal in a critical state, and even the phenomenon of invibration when vibration occurs, or even stop vibration;

9. When the crystal frequency drifts and exceeds the deviation range of the quartz crystal oscillator, the center frequency of the crystal cannot be captured, resulting in the chip not vibrating.

None

How to judge whether the crystal vibration?

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What factors can cause damage to the crystal?

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