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| Oscillo-confusion MHz GSa/s wfm/s Mpts |
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| FriedMule:
How important would you mean that 4CH is compared to 2CH for everyday use? I think that a later 4CH analog scope could be a good addition? |
| rstofer:
--- Quote from: FriedMule on December 31, 2018, 09:50:42 pm ---How important would you mean that 4CH is compared to 2CH for everyday use? I think that a later 4CH analog scope could be a good addition? --- End quote --- I bought the DS1054Z because a) it had 4 channels and b) I could afford it. I already had a 350 MHz Tek 485 but it was only 2 channels. The DSO measurements are handy but I could do without them. So, in the end, the decision was for 4 channels. SPI bus... There's at least one thing a DSO can do that an analog scope can't and that's single shot capture. If a signal comes along every day or two and I can figure a way to trigger on it, I can come back a week later and the image will still be on the screen. I realize the time scales are ridiculous but the idea is the same. An event happens, I trigger and capture it. It doesn't need to be a repetitive signal to accommodate an analog scope and I don't have to try to buy an analog storage scope. It is impossible to overstate the importance of single shot mode. There are just too many advantages to the DSO. Yes, the analog scope has a place (mine is under the bench) but most people will be well served by the features of a modern DSO. If they need an analog scope, they'll know why they need it! All that said, I got along with 2 channel scopes since I gave up on a 1 channel scope decades ago. Somehow I was able to troubleshoot SPI without 4 channels. And I could do it without single shot mode. And I got along without all the measurements. Everything worked out fine! But it's just so much easier with a 4 channel DSO. |
| rstofer:
There is certainly something to be said for the idea that 2 channels are sufficient. For just about everything, 2 channels is just fine. I hardly ever use all 4 channels simultaneously. But they're there when I want to work on something like SPI which just happens to be my favorite serial protocol. Yes, things get done with 2 channel scopes. But there are some things that really take advantage of 4 channels. The question is: "What are they worth to you?". To me, the 4 channels was the only reason to buy the DS1054Z. I could get along without single shot mode. But I don't have to! |
| FriedMule:
So would you buy a 4ch 200MHz 1GSa/s or a 2ch 350MHz 2GSa/s for "whatever use"? |
| tggzzz:
--- Quote from: FriedMule on January 01, 2019, 01:31:23 am ---So would you buy a 4ch 200MHz 1GSa/s or a 2ch 350MHz 2GSa/s for "whatever use"? --- End quote --- For "whatever" == "signal integrity", go for 350MHz since it is higher than 200MHz. Add cost of probes of course, for every channel For "whatever" == "protocol decode", go for a logic analyser, since it is much cheaper, is faster, and is more flexible and powerful in the digital domain. |
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