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Author Topic: Portable Osciloscope Troy Hilsman Powell Film Handler Posts: 30 From: Jacksonville,FL Registered: May 2007 posted 08-31-2008 02:48 PM                     Call astrotoo electronics.I think it is astrotoo.com You would be surprised at what they have.Been there done that great store.  |  IP: Logged Fernando Cavallero Film Handler Posts: 6 From: Buenos Aires Argentina Registered: Mar 2007 posted 08-31-2008 05:49 PM                     Thanks for your data Noel. The most critical views in digitals are the A-chain azimuth (usually plenty "crazy dots") an the "grass" inside the video sygnal. In digital scopes the focus is the high bright grass instead of the less bright in analogs. How do that sygnals look? Are they enougt similar as in analogs? Regards  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 08-31-2008 11:04 PM                     OK, here’s a question: Let’s say you have used a good analog scope for a while, and already ‘know’ what to look for when doing SR-D and optical A-chains. Would a less expensive digital scope (like Noel described) be good enough when doing a just a digital SR-D voltage check, or an optical A-chain alignment? What I mean is, could you use a simple digital scope for everyday stuff, and only bring out something good like a Tek 465 (all bow your heads in reverence when there is a ‘real’ problem? Hey, Noel!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-01-2008 12:38 PM                     Noel's link is broken but OWON can be googled You could use it for sine/square waves and looking for audio/digital signals for sure and assumming you have a clear view of bottom to top distance of the video waveform but it may not necessarily trigger well then yes it could be used for Peak to Peak video voltage settings. It only has a 100mS/s sample rate which couldn't be classified as very high for looking at composite video. The best way to see if it is really uable would be to set the P to P level with the digital scope and then verify the digital scope with a known good analog scope. Still only the very expensive digital scopes are really any good or able to present a really accurate waveform, you must have a pretty dang high sampling rate. The Tektronix TDS 210 which is an older low end 60mhz digital scope has a 1GS/s sample rate, while the higher end digital scopes do 40GS/s sample rates and beyond!!! There are some interesting videos on the Tektronix site showing different scopes(Tektronix, Agilent, LeCroy, all high end) displaying complex waveforms that is pretty interesting. Tek Scope Info Page Mark  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 09-01-2008 01:05 PM                     Try this link for Noel's scope: Digital Storage Oscilloscope Owon PDS5022S Yeah, I was just thinking that most of the time you are just checking the optical azimuth or the SR-D level.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-01-2008 03:20 PM                     Basically its intended for just general purpose use, and I'd buy it from someplace that also offers a 30 day return. This way if it can't even begin to see the SRD waveform or at least the waveform height on screen isn't correct or usable then you can return it. It looks like something they'd sell at Frys. If you have one near you or will be near one in the futire you may be in a position to compare it with the Tektronix stuff... which they also normally have on display too. Just keep in mind that the stuff there is the low end Tektronix stuff... Mark  |  IP: Logged Fernando Cavallero Film Handler Posts: 6 From: Buenos Aires Argentina Registered: Mar 2007 posted 09-01-2008 09:07 PM                     Mark, please tell us how does it work. And... if you returned it after the 30 days! John you are right. In SDR or azimuth we are looking for maximun or minumun conditions. Best bright or a more narrow graph. So which is the ideal equilibrium between cost vs behavior? That´s the question. Regards Fer  |  IP: Logged Noel Mackisoc Film Handler Posts: 8 From: Newton, NJ, USA Registered: Jun 2008 posted 09-12-2008 11:01 AM                        The only thing I noticed with the OWON was the trigger was a bit flukey (notice: not capitalized!) and needs some diddling to get stable. But it was certainly good enough for my purposes. And, yes, as others have mentioned, so long as you know what you're supposed to be seeing, an inexpensive tool, so long as it's not junk, is a nice and cost-effective addition to the ever-weightier toolkit. Cheers all.  |  IP: Logged Danial Simmonds Expert Film Handler Posts: 107 From: Kota Damansara, Selangor, Malaysia Registered: Jan 2008 posted 09-30-2008 06:12 AM                        Ive been using a Tektronix Analog osciloscope for about 2 years but few months ago we change to a small Tektronix osciloscope which is a digital one its small compact and easy to carry... Makes life much more easy... it can even save the your alignment as a picture image for reporting. Regards Dan  |  IP: Logged Fernando Cavallero Film Handler Posts: 6 From: Buenos Aires Argentina Registered: Mar 2007 posted 10-02-2008 09:30 PM                     Dan, Which model did you buy? Thanks  |  IP: Logged

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