Quality printed circuits as defined and aspired to by Elite Circuits Ltd must have:
(01) The correct track widths and copper thickness.
(02) The correct hole sizes.
(03) Holes positioned centrally in pads.
(04) No discontinuities (opens) in tracks, vias, or component holes.
(05) No partial discontinuities in tracks.
(06) No partial discontinuites in vias or component holes.
(07) No repaired discontinuites.
(08) No breakdown of isolation (shorts) between tracks and pads.
(09) Sufficient copper through hole plate to avoid outgassing.
(10) Pads that maintain solderability for a protracted period (at least two years for lead free solder).
(11) Correctly applied and cured soldermask.
(12) Correctly applied and cured component location.
Please note that bare board testing (BBT) on its own is far from being an accurate guide to the quality of a printed circuit board. It does not detect partial discontinuities, repairs, copper thicknesses, hole sizes, solderability, or track widths. A PCB that has passed BBT could have a very tenuous connection through a via, for example, and such a circuit would be prone (if not actually destined) to fail in service. This is why Elite Circuits Ltd performs many more checks than just BBT to ensure the quality of the pcbs it manufactures.
