| Products > Test Equipment |
| Sniffing the Rigol's internal I2C bus |
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| fcab100:
--- Quote from: apelly on December 23, 2013, 07:53:08 am --- --- Quote from: Carrington on December 21, 2013, 07:45:26 pm --- --- Quote from: apelly on December 20, 2013, 10:30:23 pm --- --- Quote from: Carrington on December 16, 2013, 02:43:24 pm ---Someone can take a better picture of the DS2xxxA's input stage? Apelly for example. --- End quote --- Busy, but I'll take a look in the next 48 hrs. --- End quote --- Ok, perfect, if you can take pictures of the rest, jumpers, DC / DC ... Thanks. :-+ --- End quote --- No susprises. These will have to do for now... The 'scpoe's still open, so can take more, but even a linux buff like me needed to look up a quick way to resize pics. Just let me know what you want to see. --- End quote --- Can you take pics of the jumper resistor divider just by the battery. Thanks |
| EV:
The scope I used in the test was originally 200 MHz scope DS2202. --- Quote from: A Hellene on December 23, 2013, 06:24:23 am --- --- Quote ---I find it hard to believe that firmware/software alone can turn an $800 device into one costing nearly triple. --- End quote --- Well, it is a marketing trick, euphemistically called 'scalability' where by changing the product key only, we can have multiple levels of functionality (and cost, of course) from the same product, like the Windows 7 Ultimate/Enterprise/Professional/Home/Starter installations. But, this is more like designing a 6-core i7 CPU and selling the bad i7 chips (with a defective core, for example) as 4-core i7 CPUs after disabling two cores, or as proud 2-core i3 CPUs the even more crippled ones instead of recycling the bad dies... For example, we design a 300 MHz device using cheap components (to maximise our profits) and by testing each one of these the best performers are labeled 300 MHz units, while the ones that perform up to 200 MHz are labeled 200 MHz units, and so on. Read this message to understand how it works. -George --- End quote --- |
| A Hellene:
--- Quote from: EV on December 23, 2013, 09:12:40 am --- The scope I used in the test was originally 200 MHz scope DS2202. --- End quote --- No doubt about that! I believe that most of the 72 MHz units must be able to display decently any 250-300 MHz signals. What I said before is that, in order to minimise the development/manufacturing costs, the manufacturer designed one only device and sells it in three or four bandwidth levels. Of course, I am sure that the top-notch 300 MHz models are being tested thoroughly before they get labeled as such; all the rest of devices at the assembly line are being branded depending on the market demands of the time they hit the market. This way, a 72 MHz device can perform decently at higher bandwidths (if hacked, of course). BUT: At the link in my previous message, the member Alex33 measured a bandwidth of 90 MHz on a 50 MHz device, a DS1052: That would be no problem for a device sold as a 50 MHz bandwidth one; but that limited bandwidth of 90 MHz of that specific device would restrict that very device to be sold as a DS1102 or a DS1152 of 100 or 150 MHz, respectively. -George |
| elecBlu:
DS2000 input stage is specified for that 300MHz BW, so there should be no "selection" at all for any Scope Model/BW. The other hardware (ADC) remains at the same specification for all models. |
| Pehtoori:
--- Quote from: elecBlu on December 23, 2013, 11:02:23 am ---DS2000 input stage is specified for that 300MHz BW, so there should be no "selection" at all for any Scope Model/BW. The other hardware (ADC) remains at the same specification for all models. --- End quote --- Yes for components and design, but will all DS2072 work as DS2302? There is no guarantee as they might not be tested for 300MHz. What I see "A Hellene" is trying to say. There might be defective soldering, PCB or component and Rigol has noticed this in testing and labelled device as DS2072 if it meets DS2072 specifications. I'm or "A Hellene" is not saying, that this is the case, but its clearly possibility. (Note this is only my interpretation of A Hellene, not what she/he says) |
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