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Sniffing the Rigol's internal I2C bus

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apelly:

--- Quote from: thetooth on December 04, 2013, 03:24:18 am ---
--- Quote ---...
we will release new version for DS2000A this month can you wait for it ?

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Interesting...

--- Quote from: thetooth on December 04, 2013, 03:24:18 am ---@apelly Since you're prepared to do a dump i'll let you do it once you get your kit, i'm going to talk to supplier to see if they can confirm any crashing on A version that way i can rule out or replace a dud scope before opening it.

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Boring, but sensible call. That's what I'd do.

--- Quote from: thetooth on December 04, 2013, 03:24:18 am ---I'm also having issue with LXI, but i think thats just to do with using windows 8, USB works fine by all accounts.

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Never used Win8. Probably never will. Works fine in Win7 for me. Haven't tried linux.

ted572:
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.

I have provided a listing of all of the Calibration Steps for the DG4000 in the attachment 'DG4000 Calibration Menu Items.doc' (preliminary version).  Hopefully the task can be accomplished primarily by making adjustments to the upper steps in Item 3, High Freq Flat/HFLATth.

For those of you who investigated the DG4000 internal I2C bus: Please, do you have any ides or information related to ANY of the items in my list of Calibration Steps that you may have found during your DG4000 firmware investigation?   It could be very helpful for developing a suitable complete (for all areas) Calibration Procedure for the DG4000.  Thank you for any assistance.

Teneyes:

--- 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.  ,,,,,,,,,,
Thank you for any assistance.

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This sound good, As one goes though the steps , can you see the existing values.
Is it good to see the values that an Owner with a DG4162 ca help as a base line values?

Will the procedure  require accurate Test Equipment to varify the setting?
Maybe someone with quality equipment lab can do the base line up to 200Mhz

Does the High range frequency from an ARB function use the same parameters?
Some owner have generated high frequencies with ARB

ted572:

--- Quote from: Teneyes on December 04, 2013, 05:50:41 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.  ,,,,,,,,,,
Thank you for any assistance.

--- End quote ---
This sound good, As one goes though the steps , can you see the existing values.
Is it good to see the values that an Owner with a DG4162 ca help as a base line values?

Will the procedure  require accurate Test Equipment to varify the setting?
Maybe someone with quality equipment lab can do the base line up to 200Mhz

Does the High range frequency from an ARB function use the same parameters?
Some owner have generated high frequencies with ARB

--- End quote ---
Yes you can pull up the existing values, and it could help to get data from an original factory supplied DG4162.
My hope is that - i.e. a DSA2202/2302 and/or DSA815 will be Ok to do a decent job, at least a big improvement for the above 60 MHz sine wave frequencies anyway.  Don't know yet about the extended frequency ARB functions yet, but my guess is it will be good enough as is.  As you can see from the list it could end up being a daunting job, although I'm hopeful that it will be manageable, but it will be tedious, and easy to make a 'start over' mistake (with each start over being easier, but very time consuming).

bandgap:

--- 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

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