Hello
This is my first post in this blog, so if I miss something or misread the (lenghty) thread then please just point me to the right source. I have found some posts regarding the subject of my interest, but found no definite answer to my questions... In particular: Will that scope fit into the job?
I'm planning to buy a scope (DS2072?) for hunting signal instabilities (phase shifts, glitches) in AVR applications. Having said that, the primary signal sources would be non-periodic transmission bursts, carried directly between peripherals or via serial line buffers & cables, of a carrier certainly not more than 10MHz (with possible extension towards 20MHz in the future). I expect these to be pretty stable (as I've taken every effort possible while designing the circuits, and also keeping the transmission rates sane) but want to make sure what's really happening and how far from instability the circuits are. I'm wondering (as already stated above) if that scope would fit in. I already asked the distributor (I live in Poland) to setup the test bench to check how capable in glitches-hunting the scope really is (signals of before-mentioned nature, testing for min pulse duration that would be consistently recognized as problem / triggered properly; also testing under which settings the detection would run best (wfs/s), and: how much amplitude / main waveform placement of the glitch is enough to get through triggering routine). Real life experience, however, may render different results, and that's why I'm interested in getting an independent opinion.
At the moment I think the most effective would be to trigger the scope whenever a pulse below certain duration is detected (while I can evaluate what to expect on the signal lines based on transmission parameters / clock of the core used), however that's the second question I'd like Your opinion about: Would that be a proper way of triggering, or my idea is not correct?
I'd really appreciate Your point of view, as I'd like to spend on a scope wisely (and, most preferably, only once). It may equally show that Rigol is enough or that I should still save more to get the right scope for the purpose...
Kind regards,
Michal