General > General Technical Chat
The Rigol DS1052E
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darkith:

--- Quote from: Mark_O on April 01, 2010, 01:19:33 pm ---
Which reminded me of a fable my grandmother once read to me, when I was just a lad...

"Once upon a time
....
weeping and wailing, and knashing of teeth.  The best of days were behind them. 

THE END."

--- End quote ---

Mmmm...needs a postscript:

"...but, it was later discovered that the wicked resellers had discovered this magical incantation previously, and after abusing it with their magical powers of relabeling, had been hawking the cheaper models as the high end models to the peasants for some time.  So, while the the days of easy were over, the widespread knowledge of the magical incantation prevented the company from being deceived by it's resellers, completely loosing it's high-end profit margins, and being consumed in the fires of Mount Doom..."...oh, wait, wrong storyline.
:)

D.
Mark_O:

--- Quote from: darkith on April 01, 2010, 01:49:25 pm ---
"...it was later discovered that the wicked resellers had discovered this magical incantation previously, and after abusing it with their magical powers of relabeling, had been hawking the cheaper models as the high end models to the peasants for some time..."

--- End quote ---

Cute!  But was that really true (resellers were abusing it), or just conjecture?  I know we had some speculation about the possibilities here... but no confirmation.

I've known for quite some time* that there was potential for various abuses (ever since I first did a string dump from the firmware binary, and noticed the commands without "?", implying that S/Ns and Models could be changed  :o).  I was hoping no one would notice those, but I'm not the only one with a string dumper.  After I uploaded the 2.02.02 firmware at the RCGroup forum, mxmxmx had pretty sharp eyes, and noticed it right away.  As he also pointed out, there are other commands there that adjust various offsets, that could be used for individual unit calibration/compensation purposes.  Or, to totally hose up your unit.

- Mark

P.S.  *Just to be clear... When did I know about the commands to alter the S/N and Model?  Back in November, when I downloaded the July update of the firmware binaries.  When did I know that changing them would alter the performance characteristics of the scopes?  The day that Andreas reported his findings here.
bushing:
(Thanks for the shout-out, Dave :) )


--- Quote from: anli on March 30, 2010, 12:29:50 pm ---
--- Quote from: darkith on March 30, 2010, 12:08:56 pm ---It sounds like he parsed through a firmware file for the acceptable commands, either through just searching for strings, or actually dis-assembling the binary.  You could try that, but there's no guarantee that the DS1000C series used the same method to select model...ie. it could have been done in hardware instead.

D.

--- End quote ---
I have tried to find something MODEL-related - the only fragment with "model" (case-insensitive context) is:


--- Code: ---DS1102CD    DS1062CD    DS1042CD    DS1022CD    DS1102C DS1062C
DS1042C DS1022C DS1102MD    DS1062MD    DS1042MD    DS1022MD   
DS1102M DS1062M DS1042M DS1022M DS-5110 DS-5106 DS-5104 DS-5102
Parameter  Trig_Level_K    Trig_Level_M     Gain_A_K1   Gain_A_K2   Gain_B_K1   
Gain_B_K2  Offset_1_A  Offset_1_K  Offset_1_M  Offset_2_A  Offset_2_K  Offset_2_M
ADC_Offset  ADC_A_Offset_1  ADC_B_Offset_1  ADC_A_Offset_2  ADC_B_Offset_2  %6.1f
CH1   %6d   EXT    EXT5     CH2   Trig_Sens_A     =%6.1f  Trig_Sens_K EquMin  =%d
EquTrigDelay    RealTrigDelay   RealTrigOffset  Saving...   %s  SERVICE  Model SerialID
Save   Clear  Power Up     1/2     2/2     System Parameter     Color   About InterploatorScale
Press 'Stop' key to Exit    Press 'AUTO' key to load Default Value  Press 'STOP' key to Exit
--- End code ---

--- End quote ---

Yeah, the DS1052E firmware has strings like:

--- Code: ---:STORAGE
:STOR
:TYPE?
WAVEFORMS
FACTORY
SETUPS
NONE
:TYPE
FACT
:FACTORY
:FACT
:LOAD
:INFO
:SERIAL
:SER
:SERIAL?
:SER?
:MODEL
:MOD
:EQUTRIGDELAY
:EQUTRIGDELAY?
%1.2e
:REALTRIGDELAY
:SYSSERVICE
:HARDVERSION
:SAVEPARA
:KEYS

--- End code ---

(anyone want to guess what a "factory" file is?  It looks like you can load one up from USB drive through the front-panel buttons, too)
dimlow:
Factory reset!
DavidDLC:
I made the mod to my unit and yesterday took it to the office, I connected and Agilent RF generator and also a 100 MHz Tektronix oscilloscope, then I set the generator to multiples of 10 MHz frequencies like 10, 20, 30 ..... 100 MHz at a fixed voltage and measured the signal in both scopes and they behave pretty similar.

Up to 90 MHz they were pretty close, from 90 to 100 MHz the difference was bigger but not that much.

I'm really happy with the results I obtained and now I'm confident of the change.

Well this was a basic comparison, if there is another comparison that will even give us better results, let me know and I will try to do it.
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