Hacking the Rigol DHO800/900 Scope

[scroeffie]

https://www.eleshop.nl/owon-oscilloscope-probes-2kv.html

[RogerG]

I wouldn't trust a probe in 2kV range, where the ground cable is isolated just with a thin layer of shrink tubing, as seen on the picture in eleshop.

For mains I use a properly isolated Stäubli Isoprobe III with fixed 1:10, which has CAT III 1000 V + CAT IV 600 V rating. They have a separate ground cable with clip, also with its own CAT rating. These probes come in a wide variety, also with higher voltages and 1:100. But this safety has its price:

https://www.staubli.com/de/en/electrical-connectors/products/t-m-products/high-frequency-measurement/touch-protected-passive-probes.html

[scroeffie]

this one almost 100 euros   in the netherlands  https://www.conrad.nl/nl/p/staubli-set-isoprobe-iii-hp-sonde-aanraakveilig-35-mhz-100-1-3540-v-126120.html?WT.mc_id=affiliates%3Atradetracker%3Afeed%3A126120&utm_medium=affiliate&utm_source=tradetracker&utm_campaign=308958&utm_content=Shoparize.com+Shopping

 if the ground wire is to thin or not enough isolated is it dangerous for me or for the scope ?

[RogerG]

For you.

There's always the chance that you get the live wire on the ground cable depending from what you're doing. These shrink tubes are very thin. Another point is that you can have the live wire at the outer case of the bnc then. That's why I use a scope with isolated BNCs for this task.

[TomKatt]

For you.

There's always the chance that you get the live wire on the ground cable depending from what you're doing. These shrink tubes are very thin. Another point is that you can have the live wire at the outer case of the bnc then. That's why I use a scope with isolated BNCs for this task.

Or a differential probe...  Technically not 'isolated', but exponentially safer than a passive probe with a ground lead.  Especially useful if the device chassis isn't grounded to earth, like much crt gear.

[scroeffie]

than maybe its best if i buy this one  Stäubli SET Isoprobe III-HP Sonde Aanraakveilig 35 MHz 100:1 3540 V

only thing i dont understand is the 35mhz ?

[TomKatt]

than maybe its best if i buy this one  Stäubli SET Isoprobe III-HP Sonde Aanraakveilig 35 MHz 100:1 3540 V

only thing i dont understand is the 35mhz ?

That means the probe is only rated for 35MHz - any higher frequencies will be attenuated beyond 3db.  And it's a bit out of my experience, but high voltages are frequency dependent, so that probe may not handle it's rated voltage if that voltage goes beyond 35MHz.

[FxDev]

I did as described in this post:
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5344076/#msg5344076

Second way - generation of additional options

Auto was the option for can trigger and analysis.

Thanks I did it

[RogerG]

Perfect.
Did BW expansion to 100MHz work, too?

[FxDev]

Perfect.
Did BW expansion to 100MHz work, too?

Of course!

[Lathe26]

ALL of the serial decoders have a bug where the threshold level isn't multiplied by the probe setting (nb. The attenuation setting, not the physical switch on the probe).

If you don't set the probe to 1x in the vertical menu then you have to multiply your threshold voltage by 10 (the line will be off the top of the screen).

Me? I set it to 1x for serial decoding and the level marker on screen works perfectly.

I thought I was going crazy with this issue a while ago.  Ugh.

Do we know if anyone reported this to Rigol yet?

[Aleksandr]

Is it possible to build a clock with a battery into an oscilloscope? So that the clock does not go astray.

[Fungus]

Is it possible to build a clock with a battery into an oscilloscope? So that the clock does not go astray.

It's much easier to add WiFi and let it get the time over the network.

(which it does automatically)

[Fungus]

Do we know if anyone reported this to Rigol yet?

They know about it, for sure.

Why they aren't putting out an update is a mystery. It seems like a bug that will affect a lot of people if they don't know the workaround.

[mrisco]

Is it possible to build a clock with a battery into an oscilloscope? So that the clock does not go astray.

It is better to allow it to get the time from the network, but you need to select the proper time zone. The extended UI shows the date and time automatically if a valid time is retrieved from the internet.

[norbert.kiszka]

Since DSRemote wasn't made to work with DHO800 and DHO900 series, I just ported it by myself.

It wasn't fully tested, but it works At least with DHO924S and Debian 12.5.

Exporting waveform (to a file) from internal memory doesn't work and I have no idea why. According to DHO800-Series_programmingguide_EN.pdf it should work. Command :WAV:DATA? return is: "The instruction is not supported!". Please let me know, if somebody knows how to do it.

Source code and precompiled binary: https://github.com/norbertkiszka/DSRemote_DHO800_DHO900

Feel free to use at Your own risk 

PS.  I didn't announced Debian and Ubuntu build script yet, so there it is: https://github.com/norbertkiszka/orangerigol

[RAPo]

Thanks, did have a quick tryout.
Really pleased; keep up the good work!
Some remarks (running under ubuntu 22.04.3 LTS)

• user 100 does not have the right permissions straight out of the box. Issue a chmod 0700  /run/user/1000/
• saving to waveform data does not work
• sometimes get an error that the bitmap (from save screenshot scope)m has the wrong size.
• If you invert a channel, the corresponding label is not updated (no down arrow) at the end

[RogerG]

Nothing new about the DHO ?

[ebastler]

Nothing new about the DHO ?

Just bored, or were you waiting for anything specific? 

[norbert.kiszka]

Nothing new about the DHO ?

Just bored, or were you waiting for anything specific? 

If somebody is bored, (s)he can help me with this:

[AndyBig]

If somebody is bored, (s)he can help me with this:

Help you calculate something on a calculator or help you play solitaire?

[norbert.kiszka]

If somebody is bored, (s)he can help me with this:

Help you calculate something on a calculator or help you play solitaire?

With modifying Linux kernel code, to load Rigol modules from their kernel (they don't care about GPL license - which is very bad). Or eventually with forcing their kernel to work with this (should be easier). With that, it should be possible to run Rigol scope app and use this thing also as a scope.

Edit: also somebody can help with forcing DSRemote with exporting waveform data from this scope models.

[flaotte]

Just bored, or were you waiting for anything specific? 

what is the last "goto" version for easy hacking. (Improved tool, not hacking as PoC is the key).

[AndyBig]

With modifying Linux kernel code, to load Rigol modules from their kernel ...

Why change Android to Debian in the first place? What improvement will this bring to the oscilloscope as a tool on the developer's desktop?

[norbert.kiszka]

With modifying Linux kernel code, to load Rigol modules from their kernel ...

Why change Android to Debian in the first place? What improvement will this bring to the oscilloscope as a tool on the developer's desktop?

More useful software on this scope. Which also means easier and faster hacking of a original app.