A sample or test pattern normally made outside the actual board pattern that is used for testing to verify certain quality parameters without destroying the actual board.

A portion of a printed circuit board or panel, dedicated for test purposes, that undergoes the same fabrication processes as the board, and can therefore be used to determine its acceptability. Typically test coupons are standard patterns which enable the fabricator to compare different products. Some test coupons are subjected only to non-destructive electrical tests to evaluate the fabrication process; in other cases the test coupon can be separated from the board and then used for destructive testing. Test coupons are used not only to verify quality and conformance of individual batches, but also to monitor the long-term quality of the board and fabrication process.