Inventors:
Sandor T. Farkas - Round Rock TX, US
Hector F. Martinez - Austin TX, US
Bhavesh Patel - Austin TX, US
Indrani Paul - Round Rock TX, US
Darrell J. Slupek - Austin TX, US
Aubrey Sparkman - Austin TX, US
Assignee:
Dell Products L.P. - Round Rock TX
International Classification:
H01K 3/10, G01R 31/02
US Classification:
29852, 29830, 29846, 324754, 324759, 324765
Abstract:
A test coupon on a printed circuit board used for verifying that vias in the printed circuit board are back drilled to a proper predetermined depth. Use of the coupon involves correlating a via on the board to a via of a test coupon drilling the board via and the test coupon via to substantially the same depth, where the depth is predetermined based on the board via. Then measuring the impedance of the test coupon to reveal the actual depth of the back drilling of the coupon via. Knowing the actual back drill depth of the coupon via is used to verify the back drill depth of the board via.