Hacking the Rigol DHO800/900 Scope

[shapirus]

A little preview
(Attachment Link)

Wow that looks exciting. Not just the FFT averaging app, but all the changes to have a launcher etc.

Care to give a bit more details as to what it's all about?

[Fungus]

A little preview
(Attachment Link)

Wow that looks exciting. Not just the FFT averaging app, but all the changes to have a launcher etc.

Care to give a bit more details as to what's it's all about?

Adding launchers is old news. 

I'm more interested in how to get to the home screen without a keyboard.

It looks like he's swiping down from the top of the screen...

[mrisco]

A little preview
(Attachment Link)

Adding launchers is old news. 

I'm more interested in how to get to the home screen without a keyboard.

It looks like he's swiping down from the top of the screen...

I didn't add a launcher. I kept the original Rigol to avoid screen flickering on startup. I use an accessibility app.

[Evi]

Quote from: mrisco on Today at 06:35:17

>Quote from: Fungus on Today at 04:41:45

>Quote from: mrisco on Today at 03:23:05

A little preview
> (Attachment Link)

Adding launchers is old news. 

I'm more interested in how to get to the home screen without a keyboard.

It looks like he's swiping down from the top of the screen...

I didn't add a launcher. I kept the original Rigol to avoid screen flickering on startup. I use an accessibility app.

Maybe you stop talking hints and provide reasonable description?

[enson72]

Im instal Button Master and assigned the location of the floating button. Getting out without a keyboard is not a problem https://4pda.to/forum/index.php?showtopic=1075359&ysclid=lur7plmx2b728125086

[Fungus]

Getting out without a keyboard is not a problem

I can do it with ADB, too, but can you do it without?

[mrisco]

Im instal Button Master and assigned the location of the floating button. Getting out without a keyboard is not a problem https://4pda.to/forum/index.php?showtopic=1075359&ysclid=lur7plmx2b728125086

There are many options, also "Back button" and "Zone Edge Launcher". I recomend Zone Edge that is what I'm using, this application avoids to change the Rigol launcher.

[enson72]

What does ADB have to do with it? Install the Button Master application, it has a floating button option. Turn it on so that it is displayed on all applications. On the Rigol app as well. And set it up so that by clicking it it sends you to the desktop of the launcher or wherever you need.

[mrisco]

I feel that with the app it is easier to see the peaks, what do you think?

[shapirus]

Yeah that's how it should have been implemented from the start, at least as far as indicating the values right on the peaks goes.

Averaging is nice to have, too.

[mrisco]

I uploaded the preview apk temporary here: https://github.com/mriscoc/RIGOL_DHO800_DHO900_GUI/releases/tag/FFTAVG0.3.2
Until I can find a better place.

[VicthorHW]

Hello all, this is my first post on the forum.
I am about to buy my firts digital ociloscope  .
i was about to pull the triger on the DHO814, but i have seen that is possible to hack the DHO804 to basically be a DHO814 (100Mhz BW) and more Memory Depth.

My question is:
Still possible to hack brand news (up to date firmware and software) DHO804 ?
if still possible i will get a DHO804 new, from rigol store on aliexpress.

Another question is:
Is worth to buy the DHO814, does it have any thing else (excluding the bigger bandwith) that the DHO804 dont have ?
Actualy the cost diference betwews the two aren't much, but if they are the same i dont wanna to burn money.
DHO804 -  BRL 2.488,92 - 490 USD
DHO814 -  BRL 2.754,04 - 542 USD

Aliexpress listing say that the 2 models have the same memory depth (25Mpts).
So i probably would do the hack on the DHO814 (if i buy) to get the extra memory depth.

[mrisco]

...
Another question is:
Is worth to buy the DHO814, does it have any thing else (excluding the bigger bandwith) that the DHO804 dont have ?
Actualy the cost difference betwews the two aren't much, but if they are the same i dont wanna to burn money.
DHO804 -  BRL 2.488,92 - 490 USD
DHO814 -  BRL 2.754,04 - 542 USD
..

Check in Alibaba, I bought from them and they sent me the DHO804 for a very good price with DHL shipping included.

[AndyBig]

Still possible to hack brand news (up to date firmware and software) DHO804 ?

Yes, you can easily convert your 804 into an 814 and then further increase the memory bandwidth and depth with options.

[Fungus]

My question is:
Still possible to hack brand news (up to date firmware and software) DHO804 ?
if still possible i will get a DHO804 new, from rigol store on aliexpress.

Yes,

Is worth to buy the DHO814

No.

[Mechatrommer]

Is worth to buy the DHO814, does it have any thing else (excluding the bigger bandwith) that the DHO804 dont have ?

the price for "DHO814 100MHz" sticker and man hour to upgrade 804 to 814 is worth $52, if you dont want DIY like some people, yes its worth it to get DHO814

[Cees]

I feel that with the app it is easier to see the peaks, what do you think?

Great job! Is it easy / possible to add a frequency log scale?

[mrisco]

Great job! Is it easy / possible to add a frequency log scale?

I think that it is possible but maybe not easy. Currently the app takes the FFT results from the MATH channel, if I convert to a logarithm scale maybe the plot will lose frequency resolution. Other possible solution is to take the data directly from the acquisition channel (CHn) and do the LFFT calculus inside of the plugin app. If the loss of resolution is acceptable (just visual change of data representation) then it might be easy.

Another possible solution is if the plugin can control the FFT parameters and sweep the frequency range and then stitch the data together, but I haven't explored controlling the oscilloscope from the plugin yet.

[Cees]

Great job! Is it easy / possible to add a frequency log scale?

I think that it is possible but maybe not easy. Currently the app takes the FFT results from the MATH channel, if I convert to a logarithm scale maybe the plot will lose frequency resolution. Other possible solution is to take the data directly from the acquisition channel (CHn) and do the LFFT calculus inside of the plugin app. If the loss of resolution is acceptable (just visual change of data representation) then it might be easy.

Another possible solution is if the plugin can control the FFT parameters and sweep the frequency range and then stitch the data together, but I haven't explored controlling the oscilloscope from the plugin yet.

In most cases ( so far I know) it is just a visual change. A logical consequence will be that the data points in the low range will be further apart.

[mrisco]

In most cases ( so far I know) it is just a visual change. A logical consequence will be that the data points in the low range will be further apart.

If you want, I opened a discussion site in the Github to not polute this thread with a specific topic: https://github.com/mriscoc/RIGOL_DHO800_DHO900_GUI/discussions

[VicthorHW]

First I want to say thanks to: mrisco, AndyBig, Fungus and Mechatrommer for replying my question  .

I ordered the DHO804 from AliExpress.
The main reason is because "RIGOL Store" on AliExpress actually has some stock already in my country, so I won't need to pay any import fees.
The import fees here are insane; if I have to pay the imports fees, the total cost would be 2x oscilloscopes or more  , and on the local market
(ignoring the AliExpress "RIGOL Store"), the DHO804 cost something around  6500 BRL / 1280 USD

Now I am waiting anxiously to get my new toy 

[RAPo]

I really like the app.
Had some time to look into a TCXO 10MHz 0.1ppm module.
Worked out great:

I feel that with the app it is easier to see the peaks, what do you think?

[Fungus]

Does anybody know if it's possible to make the HDMI output a second screen (not a mirror)?

[Slavius]

Hello everybody!

I recently purchased a Rigol DHO804 oscilloscope. Everything works fine, I haven’t noticed any bugs yet, but..
This question is: Why do the phases of the signals between channels 1 and 2 diverge? The higher the signal frequency, the greater the discrepancy.

My generator produces a maximum sine wave of 70 MHz, so at 70 MHz the phase difference is 20%, and it doesn’t matter between which channels, between 1 and 2, between 1 and 3, between 1 and 4!
But a nuance was noticed that between 2 and 3, 3 and 4, 2 and 4 channels there is no such phase discrepancy, only relative to 1 channel and any other.

Can someone check on their oscillation whether this is the same nonsense or not?

p.s. Activated 50 MB of memory and 100 MHz frequency.

[ebastler]

Why do the phases of the signals between channels 1 and 2 diverge? The higher the signal frequency, the greater the discrepancy.

My generator produces a maximum sine wave of 70 MHz, so at 70 MHz the phase difference is 20%, and it doesn’t matter between which channels, between 1 and 2, between 1 and 3, between 1 and 4!

I assume what you are observing is "channel skew". There may be variations in the time a signal takes to travel through the scope's front end, due to parts tolerances. It is an approximately constant time offset per channel. In your scope, channel 1 seems to be different from the others by about 3 ns (20% of a signal period at 70 MHz).

You can adjust these skews in the scope software. See section 5.11 of the manual. The adjustment range is -100 to + 100 ns, so your 3 ns skew is easily within the range.

Before you do that, let the scope warm up for at least 30 minutes, and then run a self-calibration (section 21.6 of the manual). Then check the skew again and adjust in the software dialog as needed.

Edit: This thread is specifically about hacking (modifying) the scope hardware & firmware. For general discussions and questions, I think the following thread is the better choice: https://www.eevblog.com/forum/testgear/rigols-new-dho800-oscilloscope-unbox-teardown/