| Products > Test Equipment |
| Sniffing the Rigol's internal I2C bus |
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| marmad:
--- Quote from: tiagobaracho on February 06, 2014, 05:46:16 pm ---I have a DS2072A, not 2302.... its hacked to 300 mhz.. Well... i have tested and not any problem what so ever until now.... And i believe it wont have any problem right ? its just a serial number freeing the functions, not any jailbreak on software really... you can even uninstall everything, update to stock firmware and use the serial that now you have, and it will give you all the options... so, probably just one serial wont give you any instability on the device right ? --- End quote --- As posted already in this and the other thread, the 1ns time base - in the current firmware - is buggy. There are a couple of things that can make the DSO freeze or crash when on - or going to - 1ns setting. |
| idpromnut:
--- Quote from: tiagobaracho on February 06, 2014, 05:48:56 pm ---how can we test high frequencies close to 300 ? I dont have any generator.... do you know if i can probe on a computer mainbord something that would be close to those speeds ? like USB port in use, ram memory bus.. i dont know.... what the easiest way to test it at close to 300mhz ? --- End quote --- I don't think there is an "easy" way of testing it; a 300Mhz signal is useless unless you know exactly what it looks like so you can judge how well your scope is able to display it. Also, the probes that come with the 2072A are 300Mhz if I recall, or 350Mhz, which is getting pretty close to any 300Mhz test signal you might try out. You could build a Jim Williams pulse generator inspired by one of his app notes (AN47 I believe) which would allow you to get a rough measure of the bandwidth of the scope. Dave did a video on that in fact. |
| RX_Buffer[Broken];:
Hi I was also curious about performance of the DS2702A pushed to 300Mhz so recently I have done some investigating. Last week I tested My employers 300Mhz (2gsa/s) Agilent Upto 1Ghz, looking at bandwith and Nyquist response. 1 and 2 channels the later at half sample rate. I wanted to get a feel for what to expect when I repeat this on the Rigol, However ran out of time and didn't want to stay late! TODO Next week hopefully. What I do know for sure is that a Hacked ds2072a(2302A) will display a perfect sine from RF Gen. with no impurities upto 450Mhz (at reduced BW obviously). The notable dropoff @374Mhz this is were the filter Knee appears to be for mine at least. And that the 300 Mhz BW option "Tested" as having 1/3 greater BW than the 200Mhz Option logically. I hope to complete testing and publish results soon....... And yes Marmad the 1nS time base is prone to locking up the scope when other features are implemented. For me it seemed related to the Rotary Encoders ie: A fast turn of encoder knobs == lockup. Hope this is fixed in the future. :-DMM |
| Tabs:
Hi all, Firstly, thanks to cybernet, zombie28, marmad and all who have contributed to developing the contents of this thread. I can confirm the following: DSA815-TG: Preamp, 10Hz RBW & ADV Measurement unlocks work. cybernets modified DS4k firmware (DS405xUpdate) has upgraded my DS4014 to 500MHz with 1ns timebase. No observed crashes or negative effects. DS4k all options unlocked works fine. I used my DSA815-TG to test the 500MHz BW upgrade on the DS4014. I used a modified setup as described by Dave in I set my tracking gen to -20dBm, swept from 0Hz to 1.4GHz with a sweep time of 14 seconds. This corresponds to 100MHz/s. I set the DS4014 to 1sec timebase, 10mv/dev scale. This represented 100MHz/div over the 14 divisions on the DS4014. Additionally, the horizontal reference for the DS4014 was set to 'Trig Pos', and moved to the extreme left Both instruments were set to external trigger (negative edge on DSA, pulse mode with pulse width > 1.5sec on DS4k). The trigger was a 5V square wave with 15 second period, generated from my DG4062. (at this speed an arduino could produce the trigger) The results for different BW limits are attached. An envelope detector on the DS4k would have come in useful (If it exists, its bloody hard to find and I've not checked the manual yet). I measured the TG output with the SA side of the DSA815. An excel plot of the extracted CSV data is attached also. For some reason I cant get the DSA to print screen to a USB. Also, I was not able to figure out how to save CSV data at controlled time intervals on the DS4k or DSA. The two units seem to default to 600 samples (DSA) and 1400 samples (DS4k). This made it difficult for me to align the two data sets in order to subtract the TG output from the frequency response of the DS4k. You can visually see that at 500MHz, the weird response is linked to the TG output. Note the black vertical line is just the oscilloscope trace sweeping accross. SMA cables were used + SMA to BNC adapters. Cables and connectors are good for 12GHz and result in a 1db (tbc) loss at 1G Regards Tabs Edit: I ended up using advanced math> abs(CH1) for envelope detection. |
| neslekkim:
Ok, so, I have "upgraded" my scope, kept the bandwidth as I had 200mhz, but all options, very nice solution by zombie28 and tirulerbach. I got it working by using the hexeditor approach, and rigup, but I could not get it working by using the textfile to list the keys, I could not find the privkey, but atleast i'm up now. Strange though, the ultrasigma times out so you don't know if you are good or not. What is also interesting, is that ultrasigma only shows my scope as an ds2202a, not -s, not before, or after the update, and the ultrasigma does not to be an useful app at all, other than issuing idn and installing options, how weird. Ruu on the other hand looks interresting, only if it will talk to my scope (I don't want to use usb), but I guess I only need to read a bit about that to figure it out. I would guess that the signalgen commands that are in the programming guide are somewhat similar to other signalgens from rigol?, have anyone created an app to control the signalgen from an computer? similar to what Ruu does?, since it seems like it's an addon inside the rigol I guess it would be possible to use it without it interfering with using the scope? |
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