Calibrating transition dependent timing errors in automatic test equipment using a precise pulse width generator

A calibration method and system for substantially reducing one of the components of timing error in automatic test systems. The timing associated with digital stimulus and response circuitry in a tester is different for positive and negative signal transitions. This inherent timing difference is normally measured and compensated for during the tester calibration process. The present method and system uses a short circuited transmission line as a pulse generator to achieve superior stability and accuracy when calibrating transition dependent timing in automatic test systems.