Products > Test Equipment
Sniffing the Rigol's internal I2C bus
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Rigol-Friend:

--- Quote from: egonotto on January 18, 2014, 01:48:45 pm ---I have short a timebase of 500ps/DIV

--- End quote ---

Yes, but in real this timebase is 1 ns/DIV    :--
aadamson:

--- Quote from: zombie28 on January 16, 2014, 06:45:59 pm ---One of the forum members tested my DS2k 00.02.01.00.03 firmware patch and reported that it works fine, ie. allows to use the old keygen with A scopes without any problems. This patch is a temporary solution for those who cannot or don't want to do memory dumps (at least until it's possible via USB). Of course extracting keys from memory is still preferred method, because license codes created this way should work even with future official firmware releases.

So, enjoy  ;)
https://mega.co.nz/#!FFk10SCY!UuWPXyqZwmca00pa2clOth1ryh1Z-AAgJg2yibfoUw0

--- End quote ---

For the record this worked on a brand new 2072a with 2.0 hardware.  I didn't go up to 300mhz due to the discussion about filter quality, but I did go to the 200mhz and turned back on all the other options...

oh and mine is a week 47 version for the record.
marmad:

--- Quote from: aadamson on January 18, 2014, 07:08:16 pm ---I didn't go up to 300mhz due to the discussion about filter quality...

--- End quote ---

Just for the record: the possible issue with the filter would only be when running @ exactly the 1GSa/s sampling rate with Vectors on - because at that sample rate, the Rigol does sin(x)/x interpolation - which would be susceptible to errors with frequencies above the Nyquist frequency (500MHz) - and it's not clear from tests how well the HW v.2 filter blocks those (when 300MHz BW is activated). Until the issue is completely clarified, if you want to be certain of signal fidelity at smaller time bases (i.e. running a DS2302 @ 1GSa/s), probably best to use the 100MHz BW filter.

At the 2GSa/s sampling rate (single channel), the Nyquist frequency is 1GHz, so the filter is totally fine (those frequencies would be well-attenuated) - and at lower sample rates (<= 500MSa/s) it doesn't matter because the DS2000 stops doing sin(x)/x interpolation and instead does linear interpolation - which is not susceptible to the errors (although it can't reconstruct higher frequencies as well with as few samples).

So if you're willing to put up with the idea of having a single-channel 300MHz DSO combined with a dual-channel 100MHz DSO, you can reliably use it that way. :)  (EDIT: Although I should add that the 1ns time base still seems a little bit buggy).

What we REALLY need is a hack which gives us back the 200MHz BW switch - which would be great to use when running a DS2302 w. 2 channels @ 1GSa/s. I can't understand why Rigol removed that option.
thetooth:

--- Quote from: marmad on January 18, 2014, 07:28:21 pm ---
--- Quote from: aadamson on January 18, 2014, 07:08:16 pm ---I didn't go up to 300mhz due to the discussion about filter quality...

--- End quote ---

Just for the record: the possible issue with the filter would only be when running @ exactly the 1GSa/s sampling rate with Vectors on - because at that sample rate, the Rigol does sin(x)/x interpolation - which would be susceptible to errors with frequencies above the Nyquist frequency (500MHz) - and it's not clear from tests how well the HW v.2 filter blocks those (when 300MHz BW is activated). Until the issue is completely clarified, if you want to be certain of signal fidelity at smaller time bases (i.e. running a DS2302 @ 1GSa/s), probably best to use the 100MHz BW filter.

At the 2GSa/s sampling rate (single channel), the Nyquist frequency is 1GHz, so the filter is totally fine (those frequencies would be well-attenuated) - and at lower sample rates (<= 500MSa/s) it doesn't matter because the DS2000 stops doing sin(x)/x interpolation and instead does linear interpolation - which is not susceptible to the errors (although it can't reconstruct higher frequencies as well with as few samples).

So if you're willing to put up with the idea of having a single-channel 300MHz DSO combined with a dual-channel 100MHz DSO, you can reliably use it that way. :)  (EDIT: Although I should add that the 1ns time base still seems a little bit buggy).

What we REALLY need is a hack which gives us back the 200MHz BW switch - which would be great to use when running a DS2302 w. 2 channels @ 1GSa/s. I can't understand why Rigol removed that option.

--- End quote ---
I installed the patch last night to try it and semi bricked my scope(would no longer show logo when you powered on), it came down to using a 4GB SD card in a reader, using a 2GB card or dedicated USB stick works so was able to get the firmware loaded up. lel

As i was about to ask, is it possible to only install the 200Mhz with all the other addons(i am very lazy and hate using that selector knob)? I made the mistake of thinking DSAS was 200Mhz+all options, so now i have installed 200+300+addons options. Would it be fair to say i could remove the 300Mhz option and keep the addons?

Also to note i've managed to keep my serial number and model intact(says 2302A), 50Ohm termination and BW limits(20, 100, 200) are all working as expected. And as a major plus my scope has finally stop crashing if i didn't press any buttons for more than 30 seconds.
marmad:

--- Quote from: thetooth on January 19, 2014, 02:12:08 am ---As i was about to ask, is it possible to only install the 200Mhz with all the other addons(i am very lazy and hate using that selector knob)? I made the mistake of thinking DSAS was 200Mhz+all options, so now i have installed 200+300+addons options. Would it be fair to say i could remove the 300Mhz option and keep the addons?
--- End quote ---

Yes, you should be able to.


--- Quote ---...and BW limits(20, 100, 200) are all working as expected.
--- End quote ---

Are you sure you have the 200MHz BW limit? Other people (including myself) have not seen it anymore in the latest FW version (when installing the 300MHz option) - and it's not listed in the Model A Owner's Manual or datasheet for the DS2302A.
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