Touch Key Production Test Tools Touch Key Production Test Tools Introduction Customers often ask questions with regard to production testing. Difficulties arise in testing as touch switch operation and sensitiviy is a subjective subject. One reason is due to the fact that human fingers have different dimensions. After some consideration a recmmended approach is to use a copper or brass cylinder instead of human finger contact which after experimental data sampling, produced the following sensitivity results. Steps 1. Use a 9mm diameter copper or brass cylinder covered with conductive rubber at the contact end in order to fix a contact test point and use this to test the touch terminal sensitivity. 2. This is an objective test method. If the test passes, it indicates sufficient touch key sensitivity. 3. The engineering test will be more rigorous than the production line test. In addition to using a 9mm diameter copper cylinder to test, a test should be conducted using a 5mm cylinder. ☆ Use a 9mm diameter copper or brass cylinder to test the touch key minimum sensitivity. If the copper cylinder is effective, then finger contact will also be effective, however it might be over-sensitive. Use a 5mm diameter copper or brass cylinder to test the touch key maximum sensitivity. If, when using a 5mm diameter cylinder instead of finger contact, the key is not effective, then the key may be too sensitive. 1 Touch Key Production Test Tools ※ Cylinder specifications: material is brass,length is 120 mm, diameter is 9mm and 5mm,conductive rubber pad is H 2mm. The cylinder specifications mentioned above have been obtained from multiple human body sampling and actual test results. Keep the cylinder conductive rubber cap parallel to the touch keys during operation to ensure good touch key contact. Reference Data Appendix: Touch key test results Body Thickness 1.6mm Press Lightly Press Heavly 35 46 17 35 32 41 31 44 16 36 22 35 31 40 22 43 Copper Cylinder 9mm 5mm 31 15 38 13 31 13 31 13 32 12 30 12 26 11 25 12 Note:The above table data is measured using the EasyTouch Tool. 2 Tester Alvin JK Viky Patrick Daniel Mei Jordan Shi’R
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