1, the mechanical structure is damaged; screw nut is loose and fall off, causing short circuit and damage; soldering or welding disconnect; fracture of brittle materials.
2, no fixed device or not self locking device will fall off.
3, easy to cause deformation of elastic components, so that contact elements (potentiometer, band switch, plug and socket, AC contactor, etc.) have poor contact or open circuit.
4, the light suddenly bright and dark, the meter pointer jitter, resulting in the observation of the readings are not allowed.
5, when the parts of the natural frequency and vibration frequency of the same, will occur resonance phenomenon, will cause serious damage to equipment.