Products > Test Equipment

Someone has hacked MDO4000C?

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Howardlong:

--- Quote from: analogRF on February 14, 2021, 06:21:15 pm ---Howardlong,
in post #9 of this thread, an MDO4034B was upgraded to 1GHz and it seems to be working fine with no warning message or DC offset
have you contacted that forum member? B versions did not even have an official BW upgrade like C versions do

--- End quote ---

Yes, I did: this appears to be a difference between B and C versions as far as we could tell.

Howardlong:

--- Quote from: analogRF on February 14, 2021, 06:15:09 pm ---
--- Quote from: Howardlong on February 14, 2021, 05:58:54 pm ---

FWIW this is mine, a 1GHz liberated MDO4054C-SA6

You get the image in either Manufacturing Mode (:MFG:MOD 1) or Development Mode (:DEV:MOD 1). For Manufacturing mode there is a different password see post #71 https://www.eevblog.com/forum/testgear/mdo3000-hacking/msg769821/#msg769821

FWIW, I've noticed that any residual channel offsets disappear when the channel is bandwidth limited to 250 or 20MHz.

(Attachment Link) .

--- End quote ---

ummm...this one also shows model number based on resistors is 1 but says 500MHz. Now I am lost...
but still it shows there have to be some ID resistors on the board to play with

I dont have a MDO4000, so are there any high res pictures of top and bottom of the main board somewhere? or can somebody provide some pictures?

--- End quote ---

FWIW, the serial number of that scope is very close to mine, you'll have enough fingers for the difference.

Howardlong:
You'll notice that if I switch my scope back to pre-liberation 500MHz state, the sample rate is 2.5GHz. Presumably that's because mine has a 6GHz rather than 3GHz SA?

darkstar49:
Experiments confirm what it seemed... every bandwidth has its own table and status.
I tried 2 -> 3, 2 -> 5 and 2 -> 10, same story, same messages.

Back to 200MHz, and it's happy again.

This confirms what the firmware says... 4 calibration/compensation tables. What I don't know is whether that 'factory adjustment' would leave existing tables unaffected...

It would be really interesting to have the NVRAM of an MDO4104C, the tables are definitely instrument-specific, but if one manages to find out the offsets and length of these tables (as well as a way to read & write from/to NVRAM), I'm pretty sure it could help a lot.

analogRF:
i dont have a MDO4000/B/C but just out of curiosity, what can happen if you send the scope for calibration after unlocking the BW and options? either to Tek or to another reputable cal lab? it seems everybody is only stuck at this point step.

also what if you dont upgrade the BW and just unlock the options and send it for routine calibration? has anybody tried that?

if I understood correctly in these scopes the options are unlocked by license keys, so unlike for example keysight 3000 which requires patching the FW, what would be the problem of sending it for calibration?

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