| Electronics > Beginners |
| Oscillo-confusion MHz GSa/s wfm/s Mpts |
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| FriedMule:
Maybe I have read wrong but for me it sounds as some of you writes: Buy high bandwidth, you will rarely use 4 channels and other says Buy 4 channels, you will properly not use high bandwidth anyway? |
| tautech:
In the some years I had a 4ch 300MHz DSO there were very few times I needed the BW and when I did a scope wasn’t really the right tool for the job and when Siglent SSA’s and SVA’s became available I grabbed one of each. I won’t be selling my beta tester SDS1104X-E SN#0012 anytime soon. |
| tggzzz:
The OP must ensure they use the correct type of probe for the job. In particular, for some jobs such as SMPSs connected directly to the mains it is necessary to have an isolating differential probe; these cost as much as a cheap scope :) https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/ |
| rstofer:
--- Quote from: FriedMule on January 01, 2019, 08:52:54 pm ---Maybe I have read wrong but for me it sounds as some of you writes: Buy high bandwidth, you will rarely use 4 channels and other says Buy 4 channels, you will properly not use high bandwidth anyway? --- End quote --- It goes either way! Using 4 channels may never happen for some users or it may happen all the time. It was my most important purchase criteria. I already had 2 channels (analog scope). Since I had never used a DSO, I had no idea how important Single Shot would be. It solves so many problems. In the old days of the analog scope, I would have to butch up my logic or code in order to have a pulse train repeat often enough to stay on the screen. With single shot I don't need to modify anything. I just select single shot and one pass is all it takes. This is a HUGE deal and one of the great benefits of the DSO. High bandwidth will never be an issue for those interested in audio. My interests are up to around 50 MHz on uC pins and usually not that high. Maybe something in the 2-5 MHz range. You never said exactly what you want to do with a scope and that's good because you aren't locking yourself into one mindset and overlooking others. Sure, in a perfect world, you would have both channels and bandwidth. Few of us live in that world! As also mentioned above, this is just a scope. Better than some, not as good as others. When you need something better, you will sell this scope for nearly as much as you paid for it and use the money toward something better. Or you will just consider it a sunk cost and keep it. I have mentioned that I want the Siglent SDS1204X-E. What to do with my DS1054Z? Well, it sits on top of one of my Comdyna analog computers, it works perfect in that application, maybe I'll just leave it there and fill the hole on my bench with the Siglent. See? It all works out! |
| vk6zgo:
--- Quote from: tggzzz on December 31, 2018, 02:40:55 pm ---Bandwidth and samples/second are completely independent. Bandwidth is all that matters in a scope, except to salesmen. I have an ~4GHz scope with ~40kS/s. Apart from that fundamental, there are many threads on "scopes for beginners" on this forum. The key points are to define what you will use the scope for, and whether you have other necessary equipment. Plus you shouldn't forget the cost of probes :) --- End quote --- There are times when you want to look at signals with quite high frequency components, whilst using a very long time/cm setting. The classic case is looking at analog video at field rate. DSOs with very small memories commonly reduce the sampling rate savagely at such settings, to the point where the required display is lost in a forest of aliasing. The early DSOs ( & some currently available really cheap ones) cannot even display analog video accurately at line rate. OK, analog video is no more, but try looking for 50/60Hz "hum" on any pulse train with HF components! |
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