Cleverscope CS300 Reference Manual v2.11
Page 78 www.cleverscope.com ©Cleverscope 2004-2015
We zoom even closer:
And we see that the pulse is in fact a pulse train, and that the digital graph is showing some kind of serial data
(SPI as it happens). The pulse train is 5.313 ms wide (see the two markers).
We zoom further and see that there are in fact 30 pulse in the train. Here is the first one, and it is 2.97us wide: