Usually, the fab charges for testing time, with prices on the order of cents per second. Testing times vary from a few milliseconds to a couple of seconds, and the test software is optimized for reduced testing time. Multiple chip (multi-site) testing is also possible because many testers have the resources to perform most or all of the tests in parallel and on several chips at once.
usually the fab charges for testing time with prices on the order of cents per second testing times vary from a few milliseconds to a couple of seconds and the test software is optimized for reduced testing time multiple chip (multi-site) testing is also possible because many testers have the resources to perform most or all of the tests in parallel and on several chips at once