Abstract
The pulse overlap method developed by May (1958) and Papadakis (1964, 1967) offers a very useful alternative to the popular pulse superposition method described by McSkimin (1965). In this method a CRO is triggered externally in time so that cycle-for-cycle match of all echoes is seen. The technique has been modified so that it can be used with an oscilloscope in which Z modulation input is not externally available or else the drive level required is not TTL compatible. So instead of Z modulation sweep trigger blanking is used for undesirable echoes. Trigger pulses are ANDed with a dual strobe generator output so that the sweep is triggered only for the echoes to be matched.
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