Theory and Method
Rotation solves a coverage problem. A drip plate or an oscillating tube delivers water along one fixed geometry, so a stationary specimen presents the same faces to the same water path for the whole test. Turning the specimen slowly beneath that source brings every side, seam, and vent into the water field in turn. IEC 60529 sets rotation at roughly 1 rpm for the drip tests, slow enough that each face accumulates meaningful exposure rather than passing through.
The method also positions the specimen off the axis of rotation, with an eccentricity of about 100 mm for drip testing. That offset traces a circular path through the drop field instead of parking the specimen center on one spot, which averages out local variation in the plate above. Deck flatness and drive stability matter here, since a table that wobbles or slows under load shifts the exposure away from what the method assumes.
Inclination handles the second characteristic numeral 2. IPX2 requires the specimen tilted 15° from its normal position and repeated across four orientations, because a tilt opens drainage paths and vent slots that sit protected when the enclosure is level. The Quali-IPX™ WT sets any angle between 0° and 15°, so one deck serves both the upright IPX1 test and the tilted IPX2 sequence. Returning the deck to 0° restores the flat orientation the spray tests use.
