| 摘要 |
A method for use with digital automated test equipment for measuring an asynchronous analog frequency, which analog frequency may be up to at least four times the operational frequency of the digital automated test equipment. From test vectors related to the frequency of interest known to represent good components, a pattern of test vectors with randomly assigned timing sets is created. Then, the maximum number of counts and the period increment is set. The selected pattern of test vectors are then applied to the unit under test and the received waveforms compared to the stored patterns. If there is no match, the period of the timing sets within the frequency range of interest is adjusted by a predetermined increment, and the test is repeated until there is a match. Since the period is now known, the frequency of the asynchronous analog signal can be calculated.
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