Author Topic: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware  (Read 310231 times)

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Offline RogerG

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #725 on: October 09, 2024, 11:48:24 am »
I rebooted a dozen times of course, connection refuses or is extremely weak.
The (passive) hub in between let it work perfectly. Dont't understand why.
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #726 on: October 09, 2024, 11:53:04 am »
or is extremely weak.

Practically You explained it to yourself. It's not the USB related problem, but rather weak signal quality/strength. Try to use USB extension cord or place your scope in different place/position.

Offline RogerG

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #727 on: October 09, 2024, 12:07:43 pm »
It happens both at exactly same position...
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #728 on: October 09, 2024, 12:28:18 pm »
It happens both at exactly same position...

USB HUB can cause electromagnetic signal deflection and shielding of other deflections.

Offline Fungus

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #729 on: November 03, 2024, 04:46:56 pm »
Hi everyone,
my newly purchased DHO914 is acting strange when pressing the buttons.
The buttons respond multiple times or sometimes not at all. It's odd.

I think you you got a defective one. Send it back.
 

Offline bobasaurus

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #730 on: November 07, 2024, 11:27:34 pm »
I ended up sending my dho924s back to rigol for an rma to fix the screen mirroring (it kept happening occasionally).  They replaced the motherboard which didn't help, then replaced the screen which seems to have fixed it.  I've been using it for a few days now without issue. 

They did kind of mar up the plastic around the screen while prying out the old one though :(
 

Offline Ventran

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #731 on: December 05, 2024, 04:02:14 pm »
Hi everyone,
my newly purchased DHO914 is acting strange when pressing the buttons.
The buttons respond multiple times or sometimes not at all. It's odd.
Here's a video showing the behavior:
Has anyone encountered this issue?

I have the exact same problem with my DHO914. Only with the physical buttons. The touch screen works perfectly. It sounds like button debouncing.

I have factory installed firmware version 00.01.01.00.02. Does installing the latest firmware version (00.01.04.00.02) solve this issue?

Video: https://mega.nz/file/IhA0xYKJ#OWgREApWfCuQiiDdQAyFWK7bYOqifKEccBcJ9FdNCLs


« Last Edit: December 05, 2024, 08:38:23 pm by Ventran »
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #732 on: December 11, 2024, 11:07:13 am »
Unfortunately, no. Updating the firmware doesn’t fix this issue. I’m still dealing with the exact same thing.
I don’t have the video anymore. I was so frustrated with this total piece of junk that I felt like smashing it.
How is it even possible to sell such garbage? Buying something from this brand was a huge mistake. I got caught up in all the hype around it.
This was my first and definitely my last purchase from this manufacturer.
It’s a complete disaster.
 :--

Sounds exactly like my own opinion. Also support practically doesn't exists.

Offline Ventran

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #733 on: December 11, 2024, 12:58:29 pm »
I completely understand you. As you know, I have exactly the same issue. I cannot recommend this equipment.

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.
 

Offline sandor626

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #734 on: December 11, 2024, 02:38:36 pm »

... Bode plot isn't mentioned in the release notes for the new firmware.
Mine DHO924s  compared to the 5000 series, there is no side menu (on the dho924s the side window can be opened but it is empty, it has no options).
Once the BodePlot option is launched, it cannot be interrupted until it is finished (and it can be very long if you select more than 100 calculation points).
Even when the Bodeplot is finished, it is not easy to close the window, because you have to select the menu from the touch screen indicated by the three horizontal lines, so the initial menu (with multiple windows) will open again and from it you will have to deselect the function to turn off the Bode Plot. I also read about some forumers who complained about the low precision of the graph, but they made wrong tests using the unconnected inputs 1 and 2; in this condition the two oscilloscope inputs are selected on the highest sensitivity value and will only trace noise, with completely incalculable signal and phase values. The bode plot requires a sinusoidal signal to be sent to input 1 that will be compared to the signal provided by the DUT to input 2. So even if it is not yet correct, to do a test it is necessary to connect the GEN output to input 1 and input 2. In this way a perfect linearity of the graph is obtained. However, it is highly advisable when testing real DUT devices, to protect the GEN with a wideband injection transformer, especially if switching power supplies are to be tested. For the use that I would like to make of the bode plot, with hi-fi audio amplifiers, it would be possible to do without the injection transformer, however in its place a 600 ohm 1:1 audio transformer could be used, I would have to do some tests. Ultimately I find the Bode Plot function to be very functional, even if it is almost completely automated in its choices compared to the 5000 series where it is possible to select the multiplication factor of the probes used and also the sensitivity level of input 1 and input (instead perhaps for the DHO924s the two inputs are automatically selected at the same sensitivity level). What do you think friends?

 

Offline Fungus

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #735 on: December 11, 2024, 03:15:10 pm »
Unfortunately, no. Updating the firmware doesn’t fix this issue. I’m still dealing with the exact same thing.

And yet there's a forum full of people who don't have button problems.

It's not normal, send it back under warranty.
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #736 on: December 11, 2024, 03:15:50 pm »
Once the BodePlot option is launched, it cannot be interrupted until it is finished (and it can be very long if you select more than 100 calculation points).

Never had such problem. I was always be able to stop bode plot. Beside of other bugs making it almost unusable.

I didn't read rest of Your post, because it's too long one paragraph. Why You didn't divide into 3-4 smaller paragraph?
 
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Offline 2N3055

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #737 on: December 11, 2024, 03:18:28 pm »

... Bode plot isn't mentioned in the release notes for the new firmware.
Mine DHO924s  compared to the 5000 series, there is no side menu (on the dho924s the side window can be opened but it is empty, it has no options).
Once the BodePlot option is launched, it cannot be interrupted until it is finished (and it can be very long if you select more than 100 calculation points).
Even when the Bodeplot is finished, it is not easy to close the window, because you have to select the menu from the touch screen indicated by the three horizontal lines, so the initial menu (with multiple windows) will open again and from it you will have to deselect the function to turn off the Bode Plot. I also read about some forumers who complained about the low precision of the graph, but they made wrong tests using the unconnected inputs 1 and 2; in this condition the two oscilloscope inputs are selected on the highest sensitivity value and will only trace noise, with completely incalculable signal and phase values. The bode plot requires a sinusoidal signal to be sent to input 1 that will be compared to the signal provided by the DUT to input 2. So even if it is not yet correct, to do a test it is necessary to connect the GEN output to input 1 and input 2. In this way a perfect linearity of the graph is obtained. However, it is highly advisable when testing real DUT devices, to protect the GEN with a wideband injection transformer, especially if switching power supplies are to be tested. For the use that I would like to make of the bode plot, with hi-fi audio amplifiers, it would be possible to do without the injection transformer, however in its place a 600 ohm 1:1 audio transformer could be used, I would have to do some tests. Ultimately I find the Bode Plot function to be very functional, even if it is almost completely automated in its choices compared to the 5000 series where it is possible to select the multiplication factor of the probes used and also the sensitivity level of input 1 and input (instead perhaps for the DHO924s the two inputs are automatically selected at the same sensitivity level). What do you think friends?

Don't get me wrong, but if you ever tried a FRA (Bode plot) on any of the scopes that have it well made (like R&S, Keysight, Siglent, or Analog Discovery), you would understand that Rigol's implementation is not only very superficially made but also does not show accurate results.
"Just hard work is not enough - it must be applied sensibly."
Dr. Richard W. Hamming
 
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Offline sandor626

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #738 on: December 11, 2024, 05:02:39 pm »
This issue is most noticeable when the button beeping is turned on
mine dho924s not have button problem , beeping yes, beeping no
 

Online ebourg

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #739 on: December 11, 2024, 06:18:35 pm »
I've tested the buttons on my new DHO804 and I do get some bouncing when the buttons are released. However it looks like the more I press the buttons, the less they bounce. For example on the Slope button I initially got a bounce every 10 presses, then 20 and now none after 100. Same feeling with the Cursor/Measure/Analyze buttons. The most frequent bounces happen with the Fine On/Off button, about once every 5 or 10 press (but no bounce with the Vernier button).
 
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Offline hitech95

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #740 on: December 15, 2024, 05:19:41 pm »
Hi guys,
For Christmas I was considering buying my first oscilloscope.
I was considering the DHO804, I mainly work on digital buses,
 but for that I already have a decent logic analyzer.
But having 4 channels can be useful.

I had read (in the first weeks of the product's release) that attempts
 were made to unlock the features of the more advanced models.
But in the end I did not understand what is possible and what is not.

Any recent development on such matter in the latest firmware?

Regards,
Nicolò
The important thing is to get involved, and don't give up.
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #741 on: December 15, 2024, 05:24:25 pm »
Any recent development on such matter in the latest firmware?

Yep, they fixed about half of bugs and added some more. No new features... Don't expect anything good in this firmware, at least at the next couple years.

Offline hitech95

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #742 on: December 15, 2024, 05:30:09 pm »
Back then there were some issues discussed about a firmware misbehaving.
(I unfortunatley dont remember what they were)

Do you recall if they got fixed or if there is still some huge bugs to be aware?
The important thing is to get involved, and don't give up.
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #743 on: December 15, 2024, 05:34:33 pm »
Back then there were some issues discussed about a firmware misbehaving.
(I unfortunatley dont remember what they were)

Do you recall if they got fixed or if there is still some huge bugs to be aware?

Currently I have DHO924S and as for now, Im using it with firmware which I personally made from scratch. But at least bode plot doesn't work as it should. Hard to tell how many bugs are fixed and how many are not, because it's a huge number of bugs.

Online ebourg

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #744 on: December 15, 2024, 05:35:18 pm »
Back then there were some issues discussed about a firmware misbehaving.
(I unfortunatley dont remember what they were)

Do you recall if they got fixed or if there is still some huge bugs to be aware?

That was the firmware 1.03 which was quickly withdrawn. The firmware 1.04 released last month is stable.
 

Offline RogerG

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #745 on: December 15, 2024, 05:43:27 pm »
But in the end I did not understand what is possible and what is not.

You can stay on 804 and enable the following options one by one:
- 100MHz
- 50Mpts
- CAN bus trigger and decoding.

Since fw 1.04 you can go for 824model with some patching of vendor.bin. You'll get 200MHz and 50Mpts then.

If disfunctional menu items for LA and/or AWG don't disturb, you can go for some of the 9xx models to have 125MHz or 250MHz with 50Mpts and CAN/LIN trigger and decoding.

Since more than 100MHz don't really make sense on a 4 channel scope with 1.25GS/s, IMO the first option makes most sense.

With fw 1.04 most of the bugs are removed.

Regards
Roger
 

Offline hitech95

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #746 on: December 15, 2024, 06:01:38 pm »
Back then there were some issues discussed about a firmware misbehaving.
(I unfortunatley dont remember what they were)

Do you recall if they got fixed or if there is still some huge bugs to be aware?

Currently I have DHO924S and as for now, Im using it with firmware which I personally made from scratch. But at least bode plot doesn't work as it should. Hard to tell how many bugs are fixed and how many are not, because it's a huge number of bugs.

What do you mean with firmware made from scratch?

But in the end I did not understand what is possible and what is not.

You can stay on 804 and enable the following options one by one:
- 100MHz
- 50Mpts
- CAN bus trigger and decoding.

Since fw 1.04 you can go for 824model with some patching of vendor.bin. You'll get 200MHz and 50Mpts then.

If disfunctional menu items for LA and/or AWG don't disturb, you can go for some of the 9xx models to have 125MHz or 250MHz with 50Mpts and CAN/LIN trigger and decoding.

Since more than 100MHz don't really make sense on a 4 channel scope with 1.25GS/s, IMO the first option makes most sense.

With fw 1.04 most of the bugs are removed.

Regards
Roger

Hi, my plan was just enable 100MHz and 50Mpts. I don't think i'll need to go beyond that.
So far the fastest thin I had to measure was a 24M I2S MCLK clock.
I had to ask help to a friend to use his work scope to debug a design I've made.

My main utilization of this scope is to monitor power rails, SMPSs and clocks signals.
I've found it for sale and I'm trying to figure out if its a good fit for a hobbyst as me.

Many thanks for the summary!

The important thing is to get involved, and don't give up.
 
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Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #747 on: December 15, 2024, 06:42:25 pm »
Since more than 100MHz don't really make sense on a 4 channel scope with 1.25GS/s

You think every owner of a 4 channel scope is using all 4 channels enabled all the time? Probably only two good things on this series are small size and bandwidth hackable even above 1 GHz (with the price of bigger noise).

What do you mean with firmware made from scratch?

https://github.com/norbertkiszka/Orange-Rigol

Offline AndyBig

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #748 on: December 15, 2024, 06:56:10 pm »
Currently I have DHO924S and as for now, Im using it with firmware which I personally made from scratch. But at least bode plot doesn't work as it should. Hard to tell how many bugs are fixed and how many are not, because it's a huge number of bugs.
https://github.com/norbertkiszka/Orange-Rigol
In the readme: "Oscilloscope app is not fully ported (it's not here yet).".
How do you use an oscilloscope with a non-working oscilloscope app? :)
And about the huge number of bugs - this is a strong exaggeration. There are several non-critical bugs like a poorly working Bode (does not apply to 8xx models) and a non-optimal "flat" window for FFT, but this does not prevent you from using the oscilloscope as an oscilloscope. Everything else is not bugs, but rather "this could have been done better, but it's good enough".
« Last Edit: December 15, 2024, 07:09:19 pm by AndyBig »
 

Offline norbert.kiszka

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Re: Rigol DHO800/900 Oscilloscope Bug Reports + Firmware
« Reply #749 on: December 15, 2024, 07:09:25 pm »
https://github.com/norbertkiszka/Orange-Rigol
I read in the readme: "Oscilloscope app is not fully ported (it's not here yet).".
An oscilloscope that can't work as an oscilloscope? How do you use it then? :)

Im working on it currently.

Rigol didn't sent source codes as they promised, and kernel modules (in binary form) can't be loaded by any other kernel no matter what, but I can recreate working code based on decompiled binaries. Those modules are nothing very big - just a mediators between app and physical IC's.
« Last Edit: December 15, 2024, 07:14:03 pm by norbert.kiszka »
 


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