Products > Test Equipment
Someone has hacked MDO4000C?
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r0d3z1:

--- Quote from: andyturk on April 02, 2018, 10:02:36 pm ---Note the sticker.  :-/O

--- End quote ---

@andyturk I am curious about the pcb on the bottom right of the image ? is it a kind of DIY probe that use the proprietary tek connector ?
2N3055:

--- Quote from: r0d3z1 on September 18, 2019, 06:24:38 am ---
--- Quote from: andyturk on April 02, 2018, 10:02:36 pm ---Note the sticker.  :-/O

--- End quote ---

@andyturk I am curious about the pcb on the bottom right of the image ? is it a kind of DIY probe that use the proprietary tek connector ?

--- End quote ---

That is Leo Bodnar's pulser that he uses to get that pulse on the screen.
supperman:
Hi All - Wow this thread was hard to find.. again.. for some reason. (perhaps a good thing)

I'm trying to better understand what is possible with the MDO4000C and this thread has good info but raises more questions that it answers..

1. It seems you can liberate modules and bandwidth via the python script.. probably only with the "Corrected" version so one would have to put the old python build environment together.. there are not great instructions on.. (I ran into lots of compatibility issues and code errors when I did this for my MDO3k - especially with the crypto library no longer supported)

2. @abyrvalg mentioned that MDO4000Cs may all differ from each other and you don't know what you have until you check the board IDs.. is this really true? Does anyone have details on this? So a 4024 can only be turned into a 4104 if you are lucky? (or not at all?). Anyone know about serial number ranges.. or have examples?

3. @andyturk when you say it is easy to do the application modules on the "C" you mean via the python script method?

4. @Howardlong any luck with that red stripe? Can you live with it if you can't get rid of it. Was this 100% via python or did you make changes to model numbers like on the B models..

Ahhh.... I really want to get a used mdo4k.. but don't feel I have confidence it will perform at the price point I can afford..

 
Howardlong:

--- Quote from: supperman on December 22, 2019, 06:23:15 pm ---Hi All - Wow this thread was hard to find.. again.. for some reason. (perhaps a good thing)

I'm trying to better understand what is possible with the MDO4000C and this thread has good info but raises more questions that it answers..

...

4. @Howardlong any luck with that red stripe? Can you live with it if you can't get rid of it. Was this 100% via python or did you make changes to model numbers like on the B models..

Ahhh.... I really want to get a used mdo4k.. but don't feel I have confidence it will perform at the price point I can afford..

--- End quote ---

Below is my experience with an MDO4054C-SA6. So, it may be that other versions don’t have all the hardware bits populated, ISTR there’s a scheme that shares ADCs between the SA and scope. Certainly if I run the scope and SA simultaneously, when upgraded to 1GHz bw, the scope sample rate drops to 2.5GSa/s. The same applies in scope only mode if you enable three or more channels, but that’s documented by Tek, I assume they’re interleaving ADCs.

The red stripe appeared after I’d enabled the 1GHz bw. You can remove the red stripe by going into the dev menus and allowing it to pass tests, but you need to do it after each reboot (edit: see up thread). As far as I can tell it’s only a cosmetic annoyance, obscuring the display of the screen buffer overview. The scope seems to be reasonably accurate at 1GHz bw despite not being calibrated. When you remove the 1GHz bw option, the stripe disappears after a reboot.

I’ve been unable to successfully calibrate it at 1GHz bw. It won’t let you run an SPC without a valid cal either. Switching back to 500MHz bw, everything is fine and you can run an SPC successfully.

I can’t get one of the 70 odd cal steps to pass, and I still don't know why, but it’s near the end and can take an hour and a half to get to it. I don’t have any more information about calibration other than what’s provided onscreen (very terse) combined with some information I found about calibrating a DPO4000 that helped a little. I don’t have the Fluke calibration equipment of course, but I managed to build a few jigs and voltage amplifiers that seemed adequate for a cal.

Unless I need the extra bandwidth or a function requiring 1GHz (e.g. USB HS trigger/decode), I use the scope at its factory 500MHz.

I have a little USB thumb stick sized arduino keyboard macro generator with three buttons to select what options to set, saving me having to manually rekey. One button for default settings, one with everything enabled except 1GHz (my usual selection) and finally one with everything plus 1GHz. You need to restart the scope after each config option change.

Keep in mind that you might want to purchase the 1GHz passive probes which come up on eBay fairly frequently, but they’re not always particularly cheap. I’d already accumulated a set of four over a period of time. The 3.9pF is still a significant load at 1GHz!

What I’ve been unable to find out definitively is what is included in an upgrade from 500MHz to 1GHz, priced at about £2.3k. My reseller wanted to charge me for the upgrade, plus a new cal, plus the probes, so as that would raise the total to about 5 grand, I rejected it. I’ve read elsewhere that the probes and recal is included in the £2.3k upgrade path. If it were the latter, I’d pay for it.

Regarding the Python script, I did make a change, it’s documented somewhere on the forum, there was a problem with it choosing the right key for one of the scope series (3000, 4000B or 4000C) but I can’t remember which one. (Edit: see upthread, it affected the 4000C).
supperman:
Thank you so much @Howardlong. That is super helpful.

So you made a small hardware device that runs your codes.. that is super cool!

Do you remember what python versions you are running to make it run? Operating system/python version/crypto version? (Edit: I see now there are links in the "link" on versions.. but probably still a good questions to ask)

So you would pay 2k to get rid of the red banner? :)  (Edit: A man with similar OCD as myself??)

Many thanks and happy holidays..
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