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DG4000 - a firmware investigation

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KedasProbe:
Interesting, you have a DG4062 but the stored call settings (but not 'activated') gives you a flat responds even higher than 160MHz.

So it looks like reducing the unit to 60MHz is done after the full factory calibration of the PCB
or there is some nice self calibration feature build in that is used during this procedure.

Teneyes:

--- Quote from: ted572 on December 06, 2013, 05:08:21 pm ---DG4000 Calibration Restoration:
   So to calibrate (or rather restore the previous calibration of) your DG4000:

Press - Utility, Test/Cal, Secure Code, (put in PW) 2010, Enter, Secure OFF, (the result should be) Secure ON, Access gained.
Then for Cal. select HFLAT, Call Point (start at HFLAT 1-1), Measure Value, Input Value, press Save and wait for it to complete (about 3 seconds), select Cal Point for the next step.  Repeat for all 60 steps.  Then your done and you didn't have to make measurements or level changes.  You didn't even have to hook anything up to your DG4000 except for AC power. Hi


--- End quote ---

DG4000 Calibration Restoration:
I think the  steps:
   "Measure Value",
   "Input Value",
   "Rotate select next cal Point"
 can be stepped thru the 62 points and then save only once to save time.

ted572:

--- Quote from: KedasProbe on December 07, 2013, 11:27:56 am ---Interesting, you have a DG4062 but the stored call settings (but not 'activated') gives you a flat responds even higher than 160MHz.

So it looks like reducing the unit to 60MHz is done after the full factory calibration of the PCB
or there is some nice self calibration feature build in that is used during this procedure.

--- End quote ---
No, I do Not think this is the case.

ted572:
DG4000 Calibration Restoration:
Re. Sniffing the Rigol's internal I2C bus, Reply #1771

I now believe that the Restoration of the DG4000 calibration should be done for AC, LFLAT, and HFLAT to correct some other potential glitches.  Nothing is being changed, or has to be connected to the DG4000, so the process goes fast.  Just bring up and save all the default values for each step, starting with 1, or 1-1 (A/R).
You can also do this for 'Inner Imped' and 'Offset', although I haven't seen a case or benefit for it yet.

I just wouldn't do this for Freq Accuracy, or Counter, unless you see a need for it, and then you should complete this cal. process as prompted.

The calibration restoration is effective for both channels, it isn't necessary to repeat each cal. routine for the other channel.

cybernet:
if somebody wants to fiddle with it - DG4000 supports 2 file types.

.CDF  - "RIGOL:DG4:CALIBRATION DATA FLASH FILE"
.CDV - "RIGOL:DG4:CALIBRATION DATA VOLATILE FILE"

my, guess its that what they use at the factory. i dont see any flash routines called for the CDV files (the parser is the same)
here is what i know:

file content:

RIGOL:DG4:CALIBRATION DATA VOLATILE FILE<X*0xb14><X*0x654><0x4230>[ <X*0xb14><X*0x654> ]
if X = 1 then the bytes in [ ] are expected too.

cant see where X is coming from atm - but maybe somebody figures out a relation of the sizes to the cal items. i wasnt successfull in that.


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