Sniffing the Rigol's internal I2C bus

[AndersAnd]

  - Real oscilloscope BW ~ 900ps.

What do you mean by this? Is 900 ps the real rise time of the DS2000 series HW? Where did you get that number from?

[Carrington]

Yes. Oscilloscope Real BW is ~ 900ps.

Using my home made1K probe: (correct amplitude x2)
tr varies between 940 and 920ps.

[Carrington]

Other test:
So, oscilloscope real BW is ~ 388MHz -> 350MHz.
https://www.eevblog.com/forum/blog/eevblog-306-jim-williams-pulse-generator/msg126162/#msg126162

[ted572]

Other test:
So, oscilloscope real BW is ~ 388MHz -> 350MHz.

Is channel 2 the same or similar (also 350 MHz BW) ?

[alank2]

Wow!

Carrington:  Why not go to 1ns for those screenshots!  Is this from the CHG3 GEL?

[Carrington]

Other test:
So, oscilloscope real BW is ~ 388MHz -> 350MHz.

Is channel 2 the same or similar (also 350 MHz BW) ?

In theory, yes.

[Carrington]

Wow!

Carrington:  Why not go to 1ns for those screenshots!  Is this from the CHG3 GEL?

Because at 2ns there are more portion of the waveform in the display (especially after the transition) and then the tr estimation is more correct.

[Carrington]

Jim Williams Pulse Generator:

[seronday]

A quick check with an RF signal generator shows 3dB down between 290Mhz and 300Mhz.

[Carrington]

A quick check with an RF signal generator shows 3dB down between 290Mhz and 300Mhz.

No doubt, but I don't have a RF generator.   

My homemade 1k probe:

[AndersAnd]

A quick check with an RF signal generator shows 3dB down between 290Mhz and 300Mhz.

What does the same test show with 200 MHz BW limit activated?

[Avotronics]

Can I get clarification; Are these all the models that these instructions cover?


DP832
DS1000z
DS2000
DS4000
DSA815

Read this topic, you will probably learn a lot and avoid some mistakes in the updating process. And maybe even be able to help other members out with questions or further hacking. Lazy people will skip this step.
Make sure your have updated your Rigol to the latest firmware version before entering any keys. Except for DP832 where Rigol has changed the keys in 01.08.00, so install firmware 01.06.00 before entering any keys. Then you can upgrade the firmware to 01.08.00 afterwards. Read here.
Go to studio25's RigLOL website: http://riglol.3owl.com or Avotronics's mirror site: http://rigol.avotronics.co.uk/riglol
Enter the Rigol serial number in the "Serial:" box.
Find the correct 4 letter code for your desired option in the tables at the above website (e.g. DSAZ to enable all options on DS2000 series scopes).
Enter this 4 letter code in the "Options:" box.
Don't enter anything into the "Privatekey:" box, but just hit generate and it will fill out the box automatically and then generate a valid license key in a pop-up window.
Enter this license key in the right menu on your Rigol (check your manual) and hit Apply.
Reboot, verify options installed and enjoy!

[AndersAnd]

Can I get clarification; What models do these instructions cover?

It covers all the models mentioned at http://riglol.3owl.com
DP832; DS1000z; DS2000; DS4000 and DSA815.

DS2000A is not supported (yet).

[engr_rf]

An excellent ultra-fast rise time (50ps) pulse generator that uses a readily available ADCMP580 evaluation board is described at http://www.starlino.com/build-a-really-fast-pulse-generator-50ps-rise-time-using-an-ultra-fast-sige-comparator.html.

[Co6aka]

An excellent ultra-fast rise time (50ps) pulse generator...

Seems to me it's actually an edge-generator, which is what's really needed; a FAST and clean step from one voltage to another.

While not as fast, you can use something like the SN74LVC1G17DBVR to speed up the edges of "slow" logic:

http://www.ti.com/lit/ds/symlink/sn74lvc1g17.pdf

Got an old-n-slow pulse gen? Splice of of those in there.

[jboard146]

Great job cybernet.

Is there a possibility of getting cybernet's BW GEL hack on the DS4014?

What do i need to do to help out to make this happen? I really want to see 500Mhz BW on my DS4014.

[cybernet]

yes i would say possible, i can also modify DS4k firmware now - but i dont have one to play with - so much more trial and error would be needed.
as the firmwares are "cousins" i'd rather figure it out for the DS2k first, and then attempt the DS4k - probably the same routines then that need to be "patched"

[cybernet]

and if somebody wants to play with it - thats CHG4_RILOL - the 500Mhz attempt - gives 500ps TB - but i noticed odd behaviour (trigger is offset, and no real difference to 1ns)
i didnt do a cal btw (had no time) maybe that improves at least the trigger offset ..

http://www.filedropper.com/chg4rilol

[jboard146]

cybernet you rock.

We can test on my DS4014 once you finish figuring out the DS2k.

[alank2]

DS1000Z

edit - forget what I said about the 500uV not working here - more to test first.

I also don't think there is a bandwidth difference between the 70MHz and 100Mhz models - my rise test test shows >200MHz.  See post #32 here:

https://www.eevblog.com/forum/testgear/rigol-ds1074z-inside-picture/msg337494/#msg337494

[cybernet]

1ns TB, 200M BW Limit, and correct DS2302 Model type *yeah* ;-)

Orange noticed that the trigger is off by 3divs (lags behind) if u enable the 2nd channel - same happening, but only in 1ns mode.
maybe that is the reason why there is no official DS2302 version - anyhow i can live with that small limitation as it vanishes above 1ns TB

here is the version that will take care of model type string

http://www.filedropper.com/ds2302rilol

the "recalc" of the string is triggered by option un/install - so flush keys, and reapply them and it will become active.

did a selfcal on top of that - everything good.

[cybernet]

cybernet you rock.

We can test on my DS4014 once you finish figuring out the DS2k.

post me a link pls to the latest DS4k firmware, and i will try to repeat bel^h^h^h above stuff for the DS4k

[Circlotron]

Missing the glaringly obvious here!
When you bring up the System Info screen it now ought to show "RIGLOL TECHNOLOGIES" 

[AndersAnd]

Latest DS4k firmware is still 00.02.00 (00.02.00.00.04) according to Rigol:
http://beyondmeasure.rigoltech.com/acton/form/1579/0012:d-0001/1/index.htm

DS4k firmware changelog: https://www.eevblog.com/forum/testgear/rigol-ds4000-firmware-version/msg281248/#msg281248

Don't know if anyone has uploaded it here before, but "H.O" who has posted in this topic earlier, mentioned upgrading to it in this topic: https://www.eevblog.com/forum/testgear/rigol-ds4000-firmware-version/msg281308/#msg281308

[cybernet]

Missing the glaringly obvious here!
When you bring up the System Info screen it now ought to show "RIGLOL TECHNOLOGIES" 

guess what was my first attempt in modifying a gel file ;-) - but it really seems to come from the FPGA or something - i replaced every single RIGOL string ... didnt work out.
i rather dig into booting something of my own next - dumping FRAM/FLASH etc .. whatever could be interesting - and last but not least, running a uclinux kernel would be sweet ...