On Fri, 7 Sep 2012, Michael Haberler wrote: > > Am 07.09.2012 um 16:04 schrieb Kent A. Reed: > >> On 9/3/2012 4:51 PM, Michael Haberler wrote: >>> well, that seems to work just fine - no major surprises >>> >>> here's as screenshot from a logic analyzer connected to an Intel D5252 >>> parport, running the userland parport driver in sim mode >>> >>> http://static.mah.priv.at/public/uparport.png >>> >>> it's a 1kHz square; there are delays of up to 4ms in this trace. >> >> Logic analyzers, oscilloscopes---I know the drill but I no longer have >> easy access to such instrumentation. >> >> Has anyone come up with simple (e.g., inexpensive) ways to measure >> latencies in the range we are interested in - say a range of 1K - 100K >> pulses per second with pulse widths on the order of microseconds. > > I bit the bullet a while ago and got me an Intronix LogicPort at a setback of > $385.- (http://www.pctestinstruments.com/); but very robust, unfortunately > locked in to Windows platform and hence unsuited for scripted interaction for > automated tests; I've suggested a scripting api or at least documenting their > USB interface to enable that but it seems they dont care - looks like their > usage model idea revolves around "engineer in lab, with lab coat, in front of > Windows PC" > > http://www.sump.org/projects/analyzer/ might be a cheaper option > > this german website has a few other project mentioned: > http://www.mikrocontroller.net/articles/Logic_Analyzer#SUMP_Logic_Analyzer > and down from there
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