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Someone has hacked MDO4000C?
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analogRF:

--- Quote from: darkstar49 on January 26, 2021, 04:09:43 pm ---
--- Quote from: analogRF on January 26, 2021, 03:36:39 pm ---but at least it shows the 200MHz scope does in fact have the hardware for 1GHz BW, right?
it's probably just because of the required re- calibration that tektronix says the scope needs to be send to them for upgrade

--- End quote ---

well... the question will be: is only Tek able to do whatever is needed, or will a 'standard' calibration by an affiliated lab be OK as well...
Sending the scope in to Tek in the current state will only lead to a factory reset (at best)...   :-\

And as for the h/w, yes, it seems like it has the 1 GHz stuff, otherwise, I couldn't explain how it would be able to display that signal... although the fact that there's no attenuation (or some sort of compensation ??) is rather suspicious... (or maybe due to the lack of calibration ??? but still... more amplitude than the actual signal, i.e. 500 mV 1 GHz sine wave...?)

--- End quote ---

yes that 500mVpp RF staying unchanged over 1GHz is strange or too good to be true. Are you sure about your SG output? Does it really stay constant from say 1MHz to 1GHz?

how about trigger stability and sensitivity? is it OK at 1GHz?

some people had reported that if the device is warmed up for long time it might pass the SPC or I remember someone even changed room and his MDO passed SPC. It was not MDO4000 I think but these are things that I remember I have seen on this forum
darkstar49:
Yep... pretty sure on the signal quality and stability (got a calibrated 4GHz scope at hand), the SG is under cal as well.
Trigger stability is excellent, all channels. Sensitivity not tested yet.

From what I see, what is needed is a 'Factory adjustment'... very little hope to have this done outside Tek, I'd even bet that there's no step by step documentation of this procedure, as this is most probably done in an automated way at Tek  :(

I think the only way to have the scope stop complaining (without Tek), would be to know where these adjustment values are stored (by analyzing the firmware), copy those from a working 1 GHz model, and set the required 'flags' to mark that it has been adjusted. Probability of success this way is close to (if not below) zero.
analogRF:

--- Quote from: darkstar49 on January 26, 2021, 08:11:24 pm ---Yep... pretty sure on the signal quality and stability (got a calibrated 4GHz scope at hand), the SG is under cal as well.
Trigger stability is excellent, all channels. Sensitivity not tested yet.

From what I see, what is needed is a 'Factory adjustment'... very little hope to have this done outside Tek, I'd even bet that there's no step by step documentation of this procedure, as this is most probably done in an automated way at Tek  :(

I think the only way to have the scope stop complaining (without Tek), would be to know where these adjustment values are stored (by analyzing the firmware), copy those from a working 1 GHz model, and set the required 'flags' to mark that it has been adjusted. Probability of success this way is close to (if not below) zero.

--- End quote ---

did you get it to work properly at 1GHz?
or did you go back to 200MHz?
Howardlong:
I'm wondering if at the very least a 200MHz can be liberated to 500MHz without having a recalibration/factory adjustment. Certainly the MDO3000 could do that.

On my 4054C-SA6, I can run the SPC at 500MHz but when I liberate it to 1GHz, the channel offsets & gains set by SPC don't seem to carry across, although they're not that bad as they stand.

I did attempt a full calibration, but there's a test very near the end of the 78 or so steps that I could never get to pass, although as far as I could tell from the very terse on screen instructions, I was doing the right thing.

It would help a great deal if we could get hold of the detailed cal instructions.
darkstar49:

--- Quote from: Howardlong on February 08, 2021, 07:18:30 pm ---I'm wondering if at the very least a 200MHz can be liberated to 500MHz without having a recalibration/factory adjustment. Certainly the MDO3000 could do that.

--- End quote ---

strange that you talk about it... was planning to do that this afternoon...  ;-)     (200->350 and 200->500)

Regarding the cal, I guess that unless you get your hands on some 'insider' info, you're unlikely to be successful.
The 'automated adjustment procedure' the scope is asking for, is the automated factory calibration, which might be slightly different.

Is there any logs where the results of the calibration are visible ??
I found functions for setting the verbosity of the Cal functions in the firmware, but no idea on how to change that 'from the outside'  :-//

For one of the functions I came across, one of the error messages was "Invalid shadow registers.  Talk to Peter"   
So maybe you should talk to Peter...   :-DD


BTW, did you try to do the cal in Mfg mode ? or in Dev mode ?
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