Patent ID: 9350344
Filing Date: 2016-05-24
CPC Classification: H03K

Claim Text:
1. A method for testing a product having a plurality of capacitive sensors arranged in a first pattern using a test pattern membrane, comprising: placing the product in a test fixture; reading a first capacitance of the plurality of capacitive sensors without the test pattern membrane on the product; placing the test pattern membrane on the product, the test pattern membrane having a non-conductive substrate and a plurality of conductive areas on the non-conductive substrate, wherein the plurality of conductive areas are arranged in a second pattern that corresponds to the first pattern of capacitive sensors; reading a second capacitance of the plurality of capacitive sensors with the test pattern membrane on the product; determining a difference between the second capacitance and first capacitance for at least one of the plurality of capacitive sensors; and determining if the product is defective based on a comparison of the difference with a threshold.