|PIND - Particle
Impact Noise Detection
Extraneous solid material inside the crystal package can cause catastrophic failure of the resonator if it collides with the quartz plate, mount or plate to mount interface. The quartz plate can even be fractured by particle impact. The material may be bits of quartz, glass from the base, metal from the leads or holder, or solder balls.
The test to detect extraneous solid material is called PIND, Particle Impact Noise Detection. It is an acoustic test where the crystal is subjected to a mild shock while being acoustically monitored. The sound made by the particles as a result of the shock can be detected. If the PIND test detect particles inside the crystal the crystal is either scrapped or reworked to remove the particle.
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