General > General Technical Chat
The Rigol DS1052E
Simon:
Just to make you all aware as i've been fidling about with my scope tonight, I'm sure it is valid for most readouts (on the measure menu) but I was looking at rise and fall times, the true value seemed to be 10 nS but if I had too many waveforms on the screen and so the rises and falls were not so noticeable the scope made an error and said they were 20 nS, I had to "zoom in" to the point where a rise was well over a div to make sure it was accurate.
just thought I'd mention it, as with analog scopes: know you equipment !
bushing:
--- Quote from: drieg on April 11, 2010, 07:42:31 pm ---@bushing and especially shafri
JTAG: Please do not do any experiments with JTAG interface unless you exactly know what you are doing. You need to know CPU's surroundings very well before you can make use of it. As the attached flash exceeds cpu's address space, some signals are generated inside Lattice CPLD. You won't be able to read the flash unless you know how. Easier to use external programmer at this point.
--- End quote ---
Hm, okay. I'll probably skip the external programmer, because it seems like desoldering the flash chip (even with the proper equipment) posts some risk of damaging the unit, and I don't really have much to gain from doing it. If anyone else dumps the flash, I'd be happy to look at the contents :D
--- Quote from: drieg on April 11, 2010, 07:42:31 pm ---@bushing
JTAG/SPI: The SPI PCB-connector is quite new to Rigol scopes (only some recent scopes have it) and there is need to write more unit-specific data into flash than just model and sn info (what commands allows you). That's the reason why they must use JTAG in final phase of production...
Could you upload 02.02.04 firmware somwhere?
--- End quote ---
The presence of the BMODE pin on that SPI PCB-connector makes it seem like it's meant to allow an alternate firmware source (SPI flash) to be connected there, and that firmware could program everything else -- doesn't seem like anything else would be required. But ... there are a lot of mysteries here, so I'm just guessing ... don't mind me. :)
Someone else on this forum was kind enough to send me the firmware when I asked about it here; I bet they will be just as kind to you, if you haven't heard from anyone in a couple of days let me know and I'll go and poke someone about it.
--- Quote from: shafri on April 12, 2010, 10:42:59 am ---what external programmer are you talking about? isnt that JTAG programmer is a external prorammer? thanx 4 the precaution.
--- End quote ---
No, he means something like http://www.xeltek.com/product.php?productid=17207.
flolic:
--- Quote from: Simon on April 13, 2010, 07:27:43 pm ---...but I was looking at rise and fall times, the true value seemed to be 10 nS but if I had too many waveforms on the screen and so the rises and falls were not so noticeable the scope made an error and said they were 20 nS, I had to "zoom in" to the point where a rise was well over a div to make sure it was accurate.
--- End quote ---
IMHO, that's perfectly normal.
Simon:
yes I thought so but I'm sure a few will not be aware of it, essentially the scope is a low resolution device, it will measure what you see, so if you can't see it the scope cannot measure it accurately
TheDirty:
Done. Thanks to everyone that worked on this.
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