Products > Test Equipment

Sniffing the Rigol's internal I2C bus

<< < (613/899) > >>

GlassFET:
Mark-O,

We only quickly looked at the aliasing effects, but I don't think it's as dire as all that, nor is the 300 MHz option necessarily completely unusable in two channels near max BW. Most, if not all, of the visible aliasing that we saw occurred with a signal well above the specified 300 MHz point at the frequencies mentioned above. Exactly where aliasing became visible in the two cases of channel selection has not yet been evaluated by us. It's also a question of degree, and the specific application of the scope. I don't have a handle on the anti-aliasing filter that Rigol used although there are hints of the initial roll-off points in the measured BWs I provided, but not the steepness of the filter. When we get a chance we will try to more fully check out the aliasing story. Meanwhile others who have measured these scopes might comment.

Nevertheless, it would have been nice if Rigol had provided a 200 MHz analog filter choice in addition to the 20 and 100 MHz filters. We're hardly in a position to complain much!

marmad:

--- Quote from: GlassFET on March 10, 2014, 11:25:30 am ---Most, if not all, of the visible aliasing that we saw occurred with a signal well above the specified 300 MHz point at the frequencies mentioned above.

--- End quote ---

Aside from visible aliasing, it's imperative that sin(x)/x interpolation, to reconstruct the waveform faithfully, not receive frequencies greater than the Nyquist frequency. I'm not sure evaluating this with a simple sine or square wave is adequate.

GlassFET:
These are some of the inherent limitations of DSOs and why many of us keep an analog scope on the bench too. Each type has its advantages and disadvantages. It is always necessary to be mindful of the limitations of any kind of test instrument when making measurements. Spectrum analyzers, distortion analyzers, DMMs, whatever - they can all fool you if you haven't considered their limits.

tiagobaracho:
Hi guys...
I requested the firmware from rigol and got the DS2000(DSP)update_00.02.01.00.03 from them...
Just one doubt.... since this is the same version as the hack here to get response to the *IDN? command, makes sense to update? will have anything new ?,what i mean is that i dont know if the the hack was made with this firmware that or if the it was another but you guys renamed to .03 to be able to update to a newer version...

I have the 300mhz all options installed.

Arkku:
Hi,

I successfully unlocked all the features on my DS2072A with the instructions in this thread. In case it is helpful to others who may have trouble digging up all the relevant info in this long thread (especially since much of it seems Windows-specific), the process I found easiest on the *nix command line (OS X, Linux, BSD, etc) was:


1) Upgrade to the "license keys dump" firmware

• put the DSO2000Update.GEL (md5sum 8d28a810d45a9e8be3095cd312ec57ec ) on a FAT32 USB drive
• start scope and quickly double-tap HELP (screen will be blank, only SINGLE button lit)
• insert USB drive – CH1 should start blinking while the upgrade is in progress (takes several mins)
• When CH1 stops blinking and all buttons light up, turn off scope and remove USB drive

Note: This firmware is needed to get the private keys out of the scope, otherwise the next step won't work. However, once the keys have been extracted, the firmware can be changed back to an official version.


2) Get the identification string over the LAN

• set up the scope on the LAN (easy if router has DHCP server, just find out the scope's IP from LAN settings)
• connect to TCP port 5555 on the scope (replace "scope.localnet" with the IP) type "IDN?" + return, e.g.:


--- Code: ---$ nc scope.localnet 5555
*IDN?
RIGOL TECHNOLOGIES,DS2072A,DS2…,020……………………………………………………………………………………………………………………………………………………………………

--- End code ---

(everything after *IDN? is the reply from the scope, the …'s are replaced by lots of hexadecimal digits)


3) Generate the license key

• compile "rigup" from sources for your platform (should be a simple matter of running "make")
• in the directory with the "rigup" executable:

This is where most of the existing instructions tell you to use a hex editor, but if you've got Ruby installed here's a little oneliner script to do it straight from the command-line:


--- Code: ---echo "RIGOL …,DS2072A,DS2…,020…" | ruby -e 'f=gets.strip.split(","); print "#{[f[-1]].pack("H*")}#{f[-2]}\0"' >scope.bin

--- End code ---

Replace the everything in the double quotes after echo ("RIGOL …" etc) with the whole (long) line you got from the scope in the previous step. This will create the file "scope.bin" in the current directory.

Then you can generate the keyfile (here "scopekey.txt") with:


--- Code: ---./rigup scan scope.bin >scopekey.txt

--- End code ---

And finally generate the license using the keyfile:


--- Code: ---./rigup license scopekey.txt NS8H

--- End code ---

NS8H is the code for 300MHz with all options, you can also use NSEQ for 200MHz with all options.

This will output a key like:


--- Code: ---rigup license - Version 0.1

ABCDEF0-1234567-1234567-1234567    (NS8H = 0x1C0C7)

--- End code ---


4) Install the key

• connect to the scope's TCP port 5555 and type ":SYST:OPT:INST key" + return, where "key" is the key you got from rigup without the dashes, e.g.:


--- Code: ---$ nc scope.localnet 5555
:SYSTEM:OPTION:INSTALL ABCDEF0123456712345671234567

--- End code ---

A progress bar should appear on the scope's screen. Once it's done, restart the scope and verify that Utility -> Options -> Installed shows all options as "Official version":



Printing a new label for the scope is optional.


edit: Some people have been having trouble with the license for NS8H (300MHz with all options) being rejected with the message "License unavailable". If you get this problem, try sending the command "SYSTEM:OPTION:UNINSTALL", reboot the scope, install the official firmware, and try again. Also try entering the license manually through the scope's UI instead of over LAN.

If it still won't work for you, try the code NSEQ instead of NS8H when generating the license; this should give 200MHz with all options, and people seem to have more luck with that.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod