Products > Test Equipment
DG4000 - a firmware investigation
ted572:
cybernet Re: DG4000 - a firmware investigation
« Reply #110 on: Today at 10:53:32 PM »
Quote from: ted572 on Today at 09:54:43 PM
I Upgraded my DG4062 to a DG4202 (200 MHz), but . . .
Issue 1. What I’m seeing is that the sine wave output is flat to 100MHz within +/- ~ 0.4 dB to 100MHz, but about -1 dB @ 120MHz, ~ -2.5 dB @ 160MHz, and ~ -4.5dB @ 200MHz. The Square Wave Rise Time is about 4.1 ns, so I’m happy about that
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@screensaver - no issues for me - tried with FW 03, 06 and 07 - i doubt the mod interferes with the screensaver in any way.
@flatness - you will probably have to do a manual cal -> pw is 2010 - im no expert on that matter, but a Vrms meter should be sufficient, it seems to output different sines at different offsets/frequencies and expects you to correct the values shown in the tables - some of the tables are actually called "flatness" - so i would assume thats what can be used to tune it up to 160MHZ if not 200MHZ.
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cybernet:
I installed the DG4162 patch CEN and the freq. response is the same at 100MHz, 120MHz, and 160MHz as above with the DG4202 configuration. Thank you for the information on the Calibration with the PW. I will be looking into Cal. next. And BTW I'm not worried about the Screen Saver and agree that it is a separate issue not related to Turbocharging.
Thanks again for your assistance and all you have done for us all. It is truly awesome ! Cheers, Ted
ted572:
cybernet, or anyone else:
Do you know where I can get a DG4000 calibration procedure, or at least a description of the meanings for the various calibration points?
Any clues about the calibration would be helpful and appreciated. I have the resources to accomplish it after I find some details/clues about it.
The PW you provided cybernet did allow me access to the Manual Cal. pages. Thank you.
cybernet:
--- Quote from: ted572 on November 21, 2013, 01:39:21 pm ---cybernet, or anyone else:
Do you know where I can get a DG4000 calibration procedure, or at least a description of the meanings for the various calibration points?
Any clues about the calibration would be helpful and appreciated. I have the resources to accomplish it after I find some details/clues about it.
The PW you provided cybernet did allow me access to the Manual Cal. pages. Thank you.
--- End quote ---
not that i know of, and i doubt rigol will share it for that purpose ;-)
but the way i understood it is u just check the tables, it will do a measurement internally - you do one externaly, fix the value - and thats it.
there is also the "factory" button which seens to reset it - i fu**ed around out of curiosity with the tables, then it was off badly, and i just reset it back to normal.
the parnoid ones could always write down the old values ... no fear ;)
cybernet:
and on the heels of that - there is a calibration file format that can be loaded like the CEN files, which is probably what rigol uses to do an inital calibration. so if somebody WOULD get sane values for a 160/200MHZ upgraded one, i might look into the file format to make that available easily to the rest. (depends on time on my end) - would save some measurement and type in sessions ....
Uup:
--- Quote from: cybernet on November 21, 2013, 01:51:41 pm ---and on the heels of that - there is a calibration file format that can be loaded like the CEN files, which is probably what rigol uses to do an inital calibration. so if somebody WOULD get sane values for a 160/200MHZ upgraded one, i might look into the file format to make that available easily to the rest. (depends on time on my end) - would save some measurement and type in sessions ....
--- End quote ---
I have a DG4162, so its calibration values should be sane to at least 160MHz. I haven't compiled your code yet but thank you all the same for sharing your brilliant reverse engineering work. :clap:
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