On Tuesday 07 October 2014 06:11:04 Viesturs Lācis did opine And Gene did reply: > 2014-10-07 12:14 GMT+03:00 Mark Wendt <wendt.m...@gmail.com>: > > Then there's the issue where the software > > runs under "The Virus That Masquerades As An Operating System," > > Windoze. > > Since I use my laptop for 3D modelling, that is my only PC with > non-ubuntu OS (I am not yet aware of any decent 3D CAD application > that would work on Linux), so OS is not an issue at the moment, it has > Ubuntu as well. > > > I'd go with Gene's suggestion, or that one I posted a week or two > > ago. > > I found a message from you with a link to pocket oscilloscope. Did you > mean that? > > The reason I asked is that I do not believe in miracles and the price > looks too good for a decent oscope, I managed to find this: > http://www.eevblog.com/forum/testgear/hantek-6022be-will-it-work-for-me > / > > There is link to another forum. > Those guys do not seem very happy with the device, but the thing is > that I do not know, how much did they expect and how bad it really is > in the end. I have never owned an oscope, so I have no idea, what to > really look for. > I would like that logic analyzer feature for that "print on the wall" > wall project I wrote some time ago - we still would like to hack that > Epson head, tried to check the lines with oscilloscope (found a guy > with an oscope, visited him), but did not find out much. There are few > lines that seem to switch particular areas of nozzles on and off, so > we decided that logic analyzer would help there. > > 2014-10-07 12:53 GMT+03:00 andy pugh <bodge...@gmail.com>: > > If you have the money they go to 20 GHz.... > > The price list I found had nothing below 10K EUR... > > 2014-10-07 12:01 GMT+03:00 Erik Christiansen <dva...@internode.on.net>: > > Viesturs, if the logic analyser is a requirement, then something like > > the Bitscope that I use might be an option. > > Could you, please, share exact model number, so that I can look it up > or even a link to particular device? > > It is not that I am sticking with the cheapest possible solution, the > intended budget was up to 300 eur. I just would not want to spend some > extra for features that sound cool to me as a newbie, but are of very > specific use that I will never need. OTOH I do not want to purchase > cheapest machine and then find out that it is basically useless (which > is the case very often, when one does not know, what to look for - > like me at the moment). > > Viesturs
Looking at that "menu", which is quite a lengthy smörgåsbord, I think we'd need to know what it is that you want to do. Years back now, I needed a scope and all the station could then afford was a 35mhz dual trace Phillips, probably a relabel of an early J.A.Pan model. It worked well, but I could also detect its limits when using it on an NTSC video signal. Since then I haven't been happy with less that a 100 MHz dual trace. It has just enough definition that I can look at a non-ecl digital signal, and see the ringing on a level transition reach above the supply rail, or below the ground rail, far enough that I could see the substrate diodes turning on and clipping the tip of the ringing off. This is not good for the IC's and shows that the board layout needs help, but most of the time all one can do is cut the trace and insert a small (<47 ohms) resistor to slow the edges a wee bit. Good for the target IC yes, but that also costs you noise margin so the net result in terms of noise margin may not be as huge a plus as you expected. Such details are quite important in TTL circuitry, less so in CMOS since the logic uncertainty is in the 40-60% of the rail voltage, but CMOS drives to within millivolts of the power rails, usually delivering a sine-squared rise & fall ramp. Circuitry-wise, this is a huge improvement unless traces are many feet long and the environment is noisy enough that the trace is acting like an antenna to both radiate it, and pick it up. But recognizing that clipping is something that generally comes from 60+ years of using a scope that can show you that stuff. And that is something a logic analyzer simply isn't capable of doing until the condition actually forces a repeatable logic mistake. Thats maybe .0000001% of the time even in bad designs that should never have been shipped to the board house. But its often enough the gear will get a reputation as being flaky out in the field. A slower scope won't show you that regardless of the maker label on it. My $0.02. > ----------------------------------------------------------------------- > ------- Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer > Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS > Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White > paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog > Analyzer > http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg. > clktrk _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
