The wearer can sometimes drop their watch out of clumsiness. When it hits the ground, the watch will sustain an extremely violent impact, of up to 150'000 m/s2 depending on the nature of the ground. The wearer then picks it up in the hope that it has not been damaged and that it will continue to tell the time with the same accuracy.
These accidental scenarios are covered by testing the watches as per standard ISO 1413 (NIHS 91-10). This has just been revised, with the two traditional shocks on the flank at 9 o'clock and on the crystal supplemented by an additional impact on the crown, and by two free-fall shocks on the watch fitted with its wristlet.
After these stresses, the appearance and operation of the watch are inspected, to ensure that no components have been damaged, and that its rate is still accurate. For water resistant watches, water resistance is also checked in order to ensure that there will be no water infiltration.
In addition to these tests, thanks to its expertise in the field ofshocks, Laboratoire Dubois can help its customers check its own equipment and advise them on equipment development.
Note: 9.81 m/s2 = 1gn