Metal Dome Test Criteria
1.Dome Trip Force Measurement
Test Stand: Chatillon model LTC with fine feed platform.
Force Gauge: IMADA linear spring type, 0-1000 grams, with 5 gram divisions, model PS1.
Test Point: 3.0mm (0.12") diameter with flat bottom.
Height Gauge: 0.001-600mm, with 0.001 mm devisions
Position the center of the metal dome to be tested within .010" of the test point center of Trip/Rebound Force Tester. The test point must be perpendicular to the dome. The dome must be on a hard flat surface, and needs to be vented to avoid air entrapment. Air trapped under the dome will increase the trip force and give a false reading.
2.Dome Life Testing
Metal Domes are tested on a hard flat surface perpendicular to the actuator of Dome Life Tester. The actuator must be in the center of the dome. The dome is attached by a means of plastic tape using pressure sensitive adhesive and providing for venting of the dome.
We consider a metal dome or dome arrays to have failed when it no longer exhibits a crisp tactile feedback or has dropped significantly in trip force.