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Sniffing the Rigol's internal I2C bus

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marmad:

--- Quote from: ted572 on July 09, 2014, 10:58:49 am ---3. Do Not use the 300MHz BW Option!  If you have it selected for a DS2000 non A (it is OK for the DS2000A) get rid of it.  Uninstall All Options with UltraSigma and then add them back in without 300MHz BW.  If you are not sure how to do this please feel free to ask me for a procedure.

--- End quote ---

To clarify some things:

First of all - in respect to using the "300MHz" BW option - it makes NO difference if you have a DS2000 or DS/MSO2000A - other than you have the 50 ohm input impedance choice. Aside from that, as far as I've seen, Rigol did not make any major changes to the front-end.

Secondly, to all the people who believe they are magically getting a perfectly-capable "300MHz" DSO just because they put in some option codes: look at all the DSO models from highly-respected test-equipment manufacturers (Agilent, Hameg, Tektronix, etc) - do you see any 2GSa/s DSOs with a higher than 200MHz BW? No, you don't - because there are mathematical reasons why it doesn't really work well. Rigol (and the other Chinese companies) have not invented some new wonderful method for squeezing more BW out of less sample rate - they are, in fact, delivering DSOs that will have problems reproducing those kind of BW waveforms accurately at certain settings (i.e. both channels on) - period.

As long as you understand these problems, fine. But again: they are identical for both DS2000 and DS2000A - it doesn't matter which model you have.

ted572:

--- Quote from: motocoder on July 10, 2014, 02:02:01 am ---
--- Quote from: ted572 on July 09, 2014, 10:58:49 am ---Re. Post #3442 by 'motocoder':

Disregard my last question - I did exactly what I said there, and it is running the latest firmware with the options enabled. Unfortunately, I noticed that it locked up already once (in the System/Info screen, it locked up and wouldn't exit this). I am now wondering if there is some actual hardware issue with my scope...

In any event, thank you for your help.

--- End quote ---
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Reply from 'Ted572' for 'motocoder'

My recommendation....

1. Your DS2000 settings should be set for Power = 'Default', NOT 'Last'.  This way when you have a lockup, etc. and you reboot (Power cycle Off/On) your issue will be cleared.  Otherwise you can end up in a endless loop of unsuccessful reboots.
2. Clear the DS2000's FRAM to be sue this isn't an issue.  To do this:  Press and hold down the left-hand side F7 key during a reboot.
3. Do Not use the 300MHz BW Option!  If you have it selected for a DS2000 non A (it is OK for the DS2000A) get rid of it.  Uninstall All Options with UltraSigma and then add them back in without 300MHz BW.  If you are not sure how to do this please feel free to ask me for a procedure.

      Regards, Ted572.

--- End quote ---

Thanks, Ted. Did you mean to say clear FRAM by holding the F6 key during boot, or is it actually F7? The instructions that Teneyes linked to above say F6. I didn't notice any messages about clearing FRAM - does it do anything to indicate that's actually happened?

Regarding the 300MHz BW option, I do indeed have that enabled. I even forked over some money for the 300MHz probes, so it is very disappointing to learn that it causes issues...
[/quote]

Reply rfom Ted572:

Apparently 300MHz BW Option MAY NOT (?) be a problem for the DS2000 as was previously reported.  Anyway I'm going to reinstall the 300MHz BW Option in my unit, as I didn't have any issues with it before, other than the technical BW/2GHz Sampling limitations 'marmad' had previously brought to all of our attention.

DS2000, D2000A Device BW Options:  DSAJ - 100MHz BW,  DSAS - 200MHz BW,  DSEZ - 200MHz BW and all Options,  DSCA - 300MHz BW.

Teneyes:

--- Quote from: marmad on July 10, 2014, 02:20:05 pm ---So at this point, it's unknown if it's just a bug that exists in v.3 with certain settings - or is linked to 300MHz option being installed. But I have to say, before I ever used the 300MHz option, I rarely had the DS2000 crash - but it's happened many more times with it installed. But more info is definitely needed to pinpoint the source of the problem.

--- End quote ---
I agree with Marmad that the accuracy of 300MHz is questionable with only 1GSa/s,

I have installed the 300MHz option.  ( I do like 1nsec/div)
Unlike Marmad, I do not use my DSO very much (retired) and it is not required to be 100% available.
I am willing to use 300MHz in order to isolate the conditions that causes the DSO to HANG. 

I have seen in FW 00.03.00.00.00 where the Math function 'lg(' would HANG the DSO ,but that does not occured (Fixed) in FW 00.03.00.01.03. This does indicate that often Rigol has not tested new firmware changes thoroughly.

PS  , My DSO is back to S/N= DS2A000000001 with DS2302, but easy to reset

ted572:
Install - Uninstall Rigol's Options using UltraSigma

motocoder:

--- Quote from: ted572 on July 10, 2014, 07:39:20 pm ---Install - Uninstall Rigol's Options using UltraSigma

--- End quote ---

Thanks, Ted

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