Particle Impact Noise Detection (PIND)

This test detects the presence of free moving particulate contaminants within sealed cavity devices. This test is specifically directed toward relays and other devices where internal mechanism noise makes rejection exclusively by threshold level impractical. This test method also may be used prior to final sealing in the manufacturing sequence as a means of eliminating loose particles from the interior of the device.

PIND testing is specified in the following:

MIL-STD-202, MIL-STD-750, MIL-F-24755