| Electronics > Projects, Designs, and Technical Stuff |
| Which scope? |
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| Rat_Patrol:
Looking at these scopes: Rigol DS1202Z-E Rigol DS1054Z SDS1202X-E The most demanding use would probably be decoding SPI, and then general troubleshooting/debugging/general use. One particular project I have in mind is to catch a cam sensor signal on an engine so I can re-create it digitally, but its a diesel, so less than 3k RPM and a 28 hole cam gear. Not particularly demanding. They are all similarly priced and similar features. Which one do I want? |
| DaJMasta:
Probably not the best subforum for the question, but all the same: My UI preference is Siglent's between the two, though both will work fine. The DS1054Z is the oldest design of the three, so if Rigol hasn't updated it since then, it may feel the least responsive of the three. I also really prioritize 4 channels over 2, when possible, though. Since bandwidth doesn't seem to be a concern, what about Siglent's SDS1104X-E? I think it's even had a price drop recently. |
| Rat_Patrol:
Looks like the SDS1104X-E is going to be about $100 more. Probably worth it, but I'd rather not spend it. I was considering the DS1054Z simply because it was 4 channel. But starting with a 50 MHz scope and dividing that by 4, its getting kind of low on bandwidth. Maybe it still good enough though? At least at this point, I'm no power user. I have an old analog Tektronix 2235, so if I really need more than 2 channels, I could fire that back up. I can't say its been calibrated recently though ;D . I've also though about selling the 2235 to put into the new digital scope. I can't see where an analog is better than even these cheaper Rigol and Siglent, but if its a good idea to hold onto it, I will. It still works fine. |
| thm_w:
Sell the tek if you can get anything for it. For decoding SPI I would get a cheap $10 saleae clone. |
| DaJMasta:
The nice thing about the 1054Z is that the hacks to get full bandwidth and options are well documented, so as long as you don't mind running through some software stuff, you can get a lot more bandwidth out of it (and I think more memory and all decoding options) relatively easily. The 1104X-E may very well be more expensive, I think it's like $440 on amazon right now. In the same vein as the Rigol, I believe it's software hackable pretty easily to 200MHz bandwidth. Also worth mentioning (since I managed to miss it the first time), 2 channels isn't really enough to decode SPI. You can get both data channels, sure, but it's much easier when you can get the clock (and the chip select, why not!) on your inputs. Certainly helps in making sure things are being selected right and that the whole system is acting in a way you expect. Alternatively, you could measure a data line or two and a power rail to correlate some reset failure, or an output of a DAC being driven by the SPI line, or whatnot. |
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