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Sniffing the Rigol's internal I2C bus

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marmad:

--- Quote from: AndersAnd on January 14, 2014, 11:06:21 pm ---And from what I can tell Tequipment is already offering DS2302A even tough they just write "call us" for price. But their website say they have 3 in stock: http://www.tequipment.net/Rigol/DS2302A/

--- End quote ---
Remind me again - which model do you own?

AndersAnd:

--- Quote from: marmad on January 14, 2014, 11:11:22 pm ---Remind me again - which model do you own?
--- End quote ---
DS1052E  :-[

marmad:

--- Quote from: AndersAnd on January 14, 2014, 11:16:22 pm ---
--- Quote from: marmad on January 14, 2014, 11:11:22 pm ---Remind me again - which model do you own?
--- End quote ---
DS1052E  :-[

--- End quote ---

So you can be the first to take the DS2302A plunge? ;)

marmad:
Just to clarify - here's a chart showing typical BW curves for a 500MHz Nyquist frequency - in other words, the Nyquist frequency of the DS2000 when you have 2 channels ON at max. sampling rate (1GSa/s). Even though most people agree that sin(x)/x should have a sampling rate 2.5x the highest frequency, let's just assume, for simplicity sake, that it can work adequately with 2x. But any frequencies HIGHER than that 2x can cause problems for the interpolation.

The chart shows the hypothetical "brickwall" filter which would be ideal to have (the red line), a maximally flat response curve (the blue line), and a typical Gaussian response curve (the green line). The gray diagonal lines show the area of trouble: where higher-frequency signals can leak through the filter to cause mistakes in the interpolation. With the given response curves, that area is all below -8dB.

On top of this, I've overlaid the results (the yellow line) that someone posted here for the response curve of a 300MHZ "enabled" DS2000 HW v.2.  If these results are correct, the area of filter leakage (the orange diagonal lines) increases to a point above -6dB when using two channels.

I would suggest, for anyone enabling 300MHz on ANY DS2000 - that wants to be certain of signal fidelity (unless/until we see further tests), to use it only with 1 channel @ 2GSa/s (otherwise use the channel BW filter).

George10256:
I think this is an official Rigol shop.  ;)
http://www.rigol-uk.co.uk/Rigol-Digital-Oscilloscopes-DS2302A-p/ds2302a.htm#.UtXHMHmI3E1
And there is one DS2302A in stock.

I have a Rigol DS2072A with serial DS2D1543... seems week 43.
With a Firmware downgrade to 00.01.01. i got a DS2202A with all options using the keygen and DSAZ, so thats no problem.
If i upgrade to Firmware 00.02.01., the scope stay on DS2202A but all options are gone, not even the trial Version remains.

I could check the weekly key for week 43.


--- Quote from: NikWing on January 14, 2014, 09:50:01 pm ---I can't tell for sure yet since I don't know enough about it: I just tried some keys of a DSO that has the same production week as mine
and I got "license unavailable"
so it seems a memdump IS needed for every a-series DSO

--- End quote ---
But it looks like i have to take a memdump. For that i have to order a JTAG dongle, cause i don't have one.
Is there a recommendation for a fast JTAG dongle?

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