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Sniffing the Rigol's internal I2C bus

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ted572:

--- Quote from: bandgap on December 04, 2013, 07:17:27 pm ---
--- Quote from: ted572 on December 04, 2013, 03:07:52 pm ---I'm looking into determining what is involved in calibrating the DG4000 to produce a constant (flat) sine wave output level up to 200 MHz.  Although my DG4000 is essentially flat up to about 120 MHz (-1 dB), I would like it ti be flat up through 200 MHz +/- 1 dB or better. And I'm sure others with the DG4000 would also, because currently there is a 4 to 6 dB drop off.

--- End quote ---

What do you want to know? I hacked my DG4102 to a DG4202 and recalibrated reasonably well after that so that it is reasonably flat up to 200 MHz. I only did cal items 1, 2, and 3 for each channel. I didn't bother with the rest. I used a DM3068 to read all voltages except for when frequencies increased beyond 1 MHz (where my DM3068 started to have noticeable falloff). Above 1 MHz, I used my hacked DS2202 ("DS2302") to get a rough voltage value. (You'll want to have your scope connected the whole time you're doing this so that you can be sure of what frequency it is using for each step.) For the high freq flat (item 3), you'll want to use a 50 Ohm through terminator, and calculate dBm for a 50 Ohm termination. (The DM3068 can be setup to show this directly.) I'll check later and see if I still have my before/after spreadsheet. I improved flatness a LOT, though. (Within +/- 1 dB all the way to 200 MHz if I remember correctly.)

I can post more later if needed, but I am late now for an appointment!

-Clayton

--- End quote ---
Well that is great news, congratulations.  I will be going ahead also of course, but I have to wait a few days due to a family medical issue.  In the meantime it would be nice to see your before/after spreadsheet data.  It is encouraging to hear that you were able to successfully complete the process.  Thank you for describing your method and offering to share your data with us.

nazar404:
Hello .. Can anybody help me  with the keygen program as I own the Rigol Ds2072 don't understand the keygen  program..  and don't want to screw up. 

which is the working Keygen Program and does it work with Firmware 01.01.02?

ted572:

--- Quote from: nazar404 on December 05, 2013, 01:09:31 am ---Hello .. Can anybody help me  with the keygen program as I own the Rigol Ds2072 don't understand the keygen  program..  and don't want to screw up. 

which is the working Keygen Program and does it work with Firmware 01.01.02?

--- End quote ---
Read my attachment to see if this covers your questions. These are Step-By-Step Instructions that I put together. If questions please feel free to ask me.

BTW: The DS2302 is for ~ 300 MHz.

nazar404:
Thank you... for the quick reply...  I will let you know if I can get it to work

nazar404:
Mr Ted572, Thank you for your great great fix ...  And Thanks to all the people who worked on this project.
I am sure it took many hard hours of work!!! :-+

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