Scope WTF! 

Follow-up video uploading now, it's NOT the Rigol DHO800 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f58qoyCETAE.html

Kick it, usually works for me. It also helps to use multiple kicks, separated by strongly worded, yet poignant, curse words. If that doesn’t work, you can always threaten it, telling it to shape up or you’ll install Windows 95 on it tends to work.

Have had similar issue a couple weeks ago on my 3245A with cheap BNC connector cables not gripping enough on the centre pin. Bought some quality ones fault fixed.

I like this walkthrough of troubleshooting, and dealing with the unexpected.

weird...maybe theres a weird grounding issue with the front end socket... like its not screwed down all the way (you tore this one down didnt you?) and ground/shield is intermittent...

At 0:21 the noise came back when you hit it with your hand. Maybe a lose BNC or internal shield not soldered correctly? At 2:52 when you touched the BNC too... Lose BNC or improperly soldered BNC or something connected to it mechanically/electrically?

Probably a bad Tee only on the scope side or the mating surface between bnc on scope and Tee

Now we know what DHO stands for: Digitally Haunted Oscilloscope 😁

As a repair tech, be honest, have you had it apart? Hmmm... 🤣

"Any sufficiently advanced technology is indistinguishable from magic" as Arthur would say. And I thought it was some cold joint, then intermittent connection on internal shielding, then cables, then BNC connector on CH1...

Dave has slapped the jitter out of the clock

I bought a DH804 yesterday. After all night fiddling with it, finally went to bed at 6am. This morning I gave it another try and was so frustrated I retuned it. Life is to short to be mad at dodgy software and cost cutting of these fancy looking anxiety machines. I'll stick with my ten year old two channel.

Connection issue, no worries.

My Rigol 1024z had the same high frequency spikes scoping an AC current measuring coil on my APC PDU. I blamed my circuit having noise but after seeing this, not so sure.

Turn it on, don’t tear it apart

try a different "T"

Put some deoxit on your connectors? Or maybe bad solder joints inside the scope on the BNC Jack

Smacking the side of the box always worked for my dad when the TV did that. I seem to remember swearing at it helped too , apparently.

Is it properly Earthed with provided banana wire? if it is not , it is being grounded from the BNC , and that noise must be from the power adaptor being grounded from input C power to Mains ground of your bench apparattus .

Now I have reached the error window moment) Well, one GW Instek at one time frayed a lot of my nerves by suddenly starting to do calibration and other rituals similar to yours when I was examining the oscillogram. Updating the firmware to the latest one, which was several years old :) did not help. I hope Rigol fix this.

Well I'd be all over the shop too if someone was playing with my front end like that!

Did this start happening after the tests with removing the fan and overheating until it locked up?

maybe supply problem? are these scopes plugged in to the same socket? once the charger for my smartphone in the same socket as the oscilloscope made a lot of noise

remember the PCB in the back for these 4 channels are different. CH1, CH2, CH3 and CH4 will have different noise coz the print of PCB

Hit it with a bigger hammer!

Must be that broken warranty sticker (jk)

Is this from the fan upgrade, possibly unshielded fan. Just a thought

The message box is just Bugdroid doing Bugdroid things.

Regardless of the price of the tool, always question the results. :)

Passive intermod?

Strikes me as a dodgy connector. Either the bnc on the scope or your T connector

Ignoring the noise, is there any way to set sensible triggering on an AM type signal like this?

looks like SMPS interference where BNC gnd looses good connection (ground loops).

Is this the scope that overheated in the fan experiment?

microphonic frontend? By the vibrations?

This reminded me of when I was young. I got a TV as a birthday present when I turned 58 ,I had to kick it and slap it hard to make it work. However, that was back in 1953.

Let me guess, bad cable.

So are we buying these DHO or waiting for a new batch? The solder or grounding on the BNC must be wonky. So are we buying? I want to use it as portable with a battery over that USB C connector. Could that C connector absorb interference? And are we buying these?

Bad BNC on Ch1 looks likely

Do you still recommend this scope or the 1054z is better? IMHO, I will keep my 1054z.

Hmm... Definitely break-through but quite early release for Rigol...

You could try channels 3&4.

Dave, your pattern is wrong. Push the stop button, investigate the spikes frequency and pattern and start hitting 180 deg out of phase!

Likely the heatsink/shield has a tint bit of oxide on it, ans this made it float over the input section. Strip down, and polish the edges where it surrounds the input section, and this should fix it. Or the input has a cracked trace right by the input soldering, probably where the large input pin connector joins to a thin trace leading to the input relays. Scope software restarting immediately is simply an app setting, set so it will always be run by the android system, even if it crashes, it will immediately be restarted, like all phones will restart Google services if they crash, just with a blip on the screen which you will barely notice unless looking.

Interference from mobile phone pinging local towers? Does CH2-4 also have the issue?

Let's analyze the facts. The signal looks like Amplitude modulation. Dodgy connectors, other scope is fine. You either created the issue on the scope or it is a faulty. Did you check the firmware. ?

Clearly you need me to come and whack it like I did with old monochrome TVs in my childhood back in the nineteen-sixties. ps I had a HDMI cable go bad recently; it hadn't been moved in years (what the...?)

Is this the one you put the fan in? Thinking maybe some piece of shielding got out of whack? Edit: NVM 😅

Could anybody check the Zynq has a set software fuse which prevents the FPGA for loading a new firmware other than from Rigol? Otherwise it would be possible to write a open source software for this oszilloskop

I stopped buying loose crappy BNC fittings from Amazon and now only buy Amphenol fittings from Mouser

Fan you installed...maybe.

Looks like a bad shielding ground connection

Is it WOW, Woah, or What?

Dave that's a fish finder. You are seen a fluke literally

Now Rigol has become the fancier version of FNIRSI

More calibrated persistent tomfoolery required.

I believe this is a "feature" of the Ultra Vision... Just saying ;O)

keep saying "what? what? what? what? what? what? what? what? what? what?" please. it really adds value to the content.

😱

You didn't take your scope APART, did you? :D

It's just God playing dice with the universe.

"Your scope is not responding. Would you like to report about it to Google?"

Is there a Kookaburra nearby?

The old multimeter reviewer Dave Jones would've said: what a heap of absolute $#!%

Ghost 👻in the machine

Your T adapter is BNC, your scope is BNC, the cables are probably made in china

Absolutely nothing to do with you having taken it to bits, of course...

Crappy "T" BNC Adapter and perhaps loose ground internally.

TIL scopes can run on android

Mr Drama. Figure it out and get back to us.

Its running Android? That's kinda cool

Bad luck 😅

Not enough Chinese devices in that box

Just throw away the T connector!

Copeoscillos scilloscipeo loscopeoscil ...

weird aliasing?

looks like aliasing from a much higher freq than nyquist of oscilloscope sample rate

You need to hit it with a bigger hammer.

We all knew Rigol is a sub quality brand even though they fool people with a clean the front panel buttons layout, they know 80% of buyers are fooled by appearances. Eventually the inners show their sub optimal and cheap design. No surprise here !

Wasn't this the scope that you overheated when you experimented with fanless? Didn't you even say it smelled funny?

new ways to crash.... typical rigol

Try and translate "rigol" from french and stop wondering.

waste of time

I'm not an EE and I see the simplest issue in the world.... I simply faulty connection.... why all the drama and esotericism ?