Rigol DHO800/900 Oscilloscope Bug Reports + Firmware

[iMo]

I have the jitter in 804 and 924 mode. That seems not related.

..and with 1.02 fw??

He hacked his 804 to 9xx something as there is the LA option, also had 1.02..

[shapirus]

Using the latest firmware 00.01.04. Shows huge jitter when using AC coupling.
AC triggered:

What if you try to change the trigger level from 0.0V to something above or below that, for example, 1V?

[norbert.kiszka]

..and with 1.02 fw??

In 1.03 FPGA firmware was changed. Exact same binary is in 1.04.

[iMo]

Could it be the fpga bitstream change introduced the jitter? The guy had 1.02 with "no jitter"..

..and with 1.02 fw??

In 1.03 FPGA firmware was changed. Exact same binary is in 1.04.

[TheoB]

That symbol below the channel vertical scale/offset indicates you are in DC coupling in both screenshots you shared. Am I missing something?

It's about the trigger AC coupling. When using that you can leave the trigger level at zero even when the signal input is DC coupled. I use this to monitor DC supply signals. Subtract the nominal level using a fixed offset. Now any DC shift is seen, no limitation of the front end AC highpass.

[TheoB]

Using the latest firmware 00.01.04. Shows huge jitter when using AC coupling.
AC triggered:

What if you try to change the trigger level from 0.0V to something above or below that, for example, 1V?

I can change the level over the entire slope. It does not change the jitter.

[shapirus]

I can change the level over the entire slope. It does not change the jitter.

Yeah. I've just checked: same thing exactly on the 1.02 firmware, DHO804 in the 924 mode.

p.s. what's that blue histogram that you used to measure and demonstrate the amount of the jitter? I don't think I ever came across it. How do you turn that on?

[AndyBig]

p.s. what's that blue histogram that you used to measure and demonstrate the amount of the jitter? I don't think I ever came across it. How do you turn that on?

[Ventran]

I purchased my Rigol DHO914 oscilloscope from an authorized distributor in Poland, NDN-Zbigniew Daniluk. It was part of a Black Friday promotional offer, and I paid only $540 for a brand-new DHO914. However, as you know, the buttons do not work.

I reported this issue to the supplier. After a brief phone conversation, they advised me to return the device. I did so, and now I’m waiting for their response.

After waiting for a month, I finally received my Rigol DHO914 oscilloscope back. The distributor sent the device to the official service center in Germany, where the entire mainboard was replaced.

I’m currently testing the oscilloscope, and so far, everything is working as expected.

[Corsair Ko]

RIGOL DHO814 Screen Problem-Seeking help/Advice
Rigol DHO814 and the Logo does not show and the screen is black but the device is running. do you know what i can do to get the screen to lit up please?
https://youtube.com/shorts/WpYVG8jh5V0?si=JutXuIOF_41T-wpt

[AndyBig]

RIGOL DHO814 Screen Problem-Seeking help/Advice
Rigol DHO814 and the Logo does not show and the screen is black but the device is running. do you know what i can do to get the screen to lit up please?
https://youtube.com/shorts/WpYVG8jh5V0?si=JutXuIOF_41T-wpt

Most likely your oscilloscope has some physical malfunction or something is wrong with the SD card. You need to return the oscilloscope to the seller under warranty.

[mrisco]

RIGOL DHO814 Screen Problem-Seeking help/Advice
Rigol DHO814 and the Logo does not show and the screen is black but the device is running. do you know what i can do to get the screen to lit up please?
https://youtube.com/shorts/WpYVG8jh5V0?si=JutXuIOF_41T-wpt

A uSD card false contact could be the cause, you should be able to pull/push the card through the air vents.

[Smepic]

I'm testing decode SPI but sometimes i can´t see the decoded channel in zoom mode although without zoom the decoding works.

Steps to reproduce:
(From default) Activate the 3 channels and set the trigger properly to capture SPI signal.

Capture the signal.

Set and activate decode channel.

Scale out (zoom out without zoom mode) until i see almost the full signal.
Go to the zoom mode. Zoom in, and you can't see any decoding.


Video: https://clip.place/w/a39Mpp31KWehj65hU5WBtn

[Hix]

I too have the blank screen issue on the DHO814. It is new and has been used for very little time. It is not the uSD card, as this has been removed, replaced, reflashed, swapped for a known working other card, all to no avail. It was working until it stopped. I'm reporting here because I have seen Corsair Ko's post with seemingly the same issue. Strange that theirs is also DHO814 too and I've not seen others posting this...

[Fungus]

I'm reporting here because I have seen Corsair Ko's post with seemingly the same issue.

Coincidence.

I've not seen others posting this...

True.

[Corsair Ko]

Yes, my DHO814 is also new and unused.He stopped working when I turned it on after a long time.I tried to put it into operation by turning it on and off and squeezing other keys.I managed to revive it when I held the "Auto" key.After that I tried to turn on and off several times and it worked.I left it on for several hours and worked.I turned it off and turned it on and after an hour and was broken again and nothing helps to turn it on.

[Fungus]

I managed to revive it when I held the "Auto" key.

That's Voodoo logic.

Correlation is not causation.

[Corsair Ko]

Apology for bad English.I use a translation

[Corsair Ko]

.. I have removed the defect so far this way ... I tapped the device several times on the table and he works ... I do not know how long it will work ...

[shapirus]

.. I have removed the defect so far this way ... I tapped the device several times on the table and he works ... I do not know how long it will work ...

Can't beat the good old percussive repair technique.

This suggests dry solder joints and/or incomplete connector insertions and/or similar things inside. If the malfunction reappears, then it may make sense to take the scope apart, disconnect all connectors, inspect all soldering joints (and fix if necessary) and reassemble.

[Hix]

I've opened mine up and checked over it with a 10x loupe and cannot see anything by way of iffy solder joints. But it sounds like Corsair has the same issue I do. I'm reticent to go over the main board with hot air in case I do more damage than good, but am running out of options

[shapirus]

I've opened mine up and checked over it with a 10x loupe and cannot see anything by way of iffy solder joints. But it sounds like Corsair has the same issue I do. I'm reticent to go over the main board with hot air in case I do more damage than good, but am running out of options

Have you been able to communicate with it using adb or the UART port? Can it be just a dodgy display connection?

p.s. also, does it receive an IP address via DHCP (it can be seen in the router's admin panel in the list of clients)? Does it establish a network link on a physical level? Sorry I didn't follow the entire dedicated thread, just throwing some ideas that could help identify at which stage the issue may be happening.

[Hix]

So the UART on the upper right of the PCB is silent. The one next to the JTAC,/ FLASH jumper is spitting out boot information however.
I tried connecting via HDMI to see if that would bring up a boot image, but nothing. But that wasn't really a surprise.

I've opened mine up and checked over it with a 10x loupe and cannot see anything by way of iffy solder joints. But it sounds like Corsair has the same issue I do. I'm reticent to go over the main board with hot air in case I do more damage than good, but am running out of options

Have you been able to communicate with it using adb or the UART port? Can it be just a dodgy display connection?

p.s. also, does it receive an IP address via DHCP (it can be seen in the router's admin panel in the list of clients)? Does it establish a network link on a physical level? Sorry I didn't follow the entire dedicated thread, just throwing some ideas that could help identify at which stage the issue may be happening.

[shapirus]

What about ADB?

Is there any network activity at all? Try connecting it to a computer with a direct cable and run tcpdump on that interface to see if any packets are coming from the scope.

[Hix]

I'm not familiar with ADB. I used it once in something like 2011 to root an old HTC phone. But not even looked at it since.
I wouldn't know where to start using it to try to communicate with the 814.