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Sniffing the Rigol's internal I2C bus

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alank2:

--- Quote from: cosmos on November 30, 2013, 06:09:51 pm ---I did not have to do anything to the installed (riglol generated) keys and they all stayed.
The model number was still DS4014.

--- End quote ---

This may have already been asked - do you see the bandwidth options under each channel now?  (20M, 100M, 200M).

If you unload/reload your key you might possibly get the DS4054 label.  (no guarantees, it might be taking a risk to try).

Gallymimus:

--- Quote from: alank2 on November 30, 2013, 07:25:43 pm ---
This may have already been asked - do you see the bandwidth options under each channel now?  (20M, 100M, 200M).

If you unload/reload your key you might possibly get the DS4054 label.  (no guarantees, it might be taking a risk to try).

--- End quote ---

Yes, asked and answered a few pages ago.


--- Quote from: cosmos on November 27, 2013, 10:11:11 pm ---yes BW options are now: OFF, 20M, 100M, 200M

selecting 100M I get about the same rise and fall as I had before (~2ns).
selecting 200M I get around 1.5ns
selecting OFF I get mostly 1.28ns rise and 1.16ns fall (for the others it also like that with slightly lower number for fall time)
If I measure with cursors I get the same results (knowing that the IO is driven from 2.5V rails I can set the 10% and 90% referred to that)

--- End quote ---

Co6aka:

--- Quote from: alank2 on November 30, 2013, 07:25:43 pm ---If you unload/reload your key you might possibly get the DS4054 label.
--- End quote ---

I already did. It (still) doesn't. Not likely possible it seems.

Co6aka:

--- Quote from: olsenn on November 30, 2013, 04:47:50 am ---The input of the DSA815 is MUCH more accurate than the output...
--- End quote ---

FWIW...

I have one of these: http://www.home.agilent.com/en/pd-1000004297%3Aepsg%3Apro-pn-E4438C/esg-vector-signal-generator
And one of these: http://www.aeroflex.com/ats/products/product/Communications_Test/Radio_Test_Sets_-_PMR_Test/2948B_Comm_Monitor~4.html
And one of these: http://www.minicircuits.com/pdfs/PWR-4GHS.pdf

But I'm currently in heavy-construction mode :( otherwise I'd already have posted the verdict. I should be able to run and document some definitive tests by the end of the week. Unless someone beats me to the :box: punch.

Forgot to add: I also have a DSA1030A-TG3, which while an OK piece of kit, wasn't all that accurate out-of-the-box. (At least according to my other big guns, which are all calibrated.)

Co6aka:
Alright... Curiosity got the better of me, and since most fortunately I don't have to deal with the incessant nagging of a female, I set up some gear on the kitchen table:

Sig-gen: E4438C
RF power meter: PWR-4GHS
Cable: Some kind of funky 6GHz-rated flexible stuff with Huber-Suhner silver/gold connectors.
Unfortunately I don't have a BNC-female to N-female adaptor, so I had to improvise. (Apparent adapter loss, about 0.1dBm at 50 to about 0.2dBm at 1G, is "calibrated out" of my figures.) Everything "warmed up" for about 90 minutes; ambient temp was pretty stable at 22.5 degrees C.

Using a pure unmodulated sine wave carrier, I "calibrated" the E4438C and cable at 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000MHz, for almost exactly 0dBm. (The smallest steps the E4438C can do is 0.02dBm, so...) Accuracy stats for the power meter are on MiniCircuits site. (FWIW, according to the power meter, the E4438C is "off" +0.08dBm at 50MHz, which gradually changes to +0.22dBm at 1000MHz.)

Set up the DS4014 for 50-Ohm inputs and no BW limit. Here are the measured RMS voltages...

50MHz: 223mV
100MHz: 221mV
200MHz: 219mV
300MHz: 214mV
400MHz: 212mV
500MHz: 207mV
600MHz: 179mV
700MHz: 149mV
800MHz: 121mV
900MHz: 91mV
1000MHz: 58mV

So now yous guyz could do da math, I'm...  :=\  (Fuhgeddaboudit!)

(-3dB point about 650MHz)

PS- All four channels were within a mV of each other.

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