That was my first try at File.io, let me try dropbox...
https://www.dropbox.com/scl/fi/qdo6kfje8coxgxbgp9012/DHO800_DHO900-Software-Updatev00.01.02.00.00.zip?rlkey=35rzumxdyw7g6qfsv8j9flztr&dl=0
I went for the 914 to gain the CAN decoders since I frequently work with CAN bus stuff. Otherwise the BW upgrade would have been fine. I'm hesitant to buy a probe and cut a hole in my case since my cutting skills aren't pretty and I have a Saelea pro 16 on hand.
Where I can download DHO914 vendor.bin? Can't find in this topic (I found this tool https://github.com/zelea2/rigol_vendor_bin and successfully changed model to DHO914 in my own vendor.bin
I can confirm - 1.02 along with 924 vendor.bin does not show the offset issue.
Yes, I simply modded my 804 vendor.bin to a 924 one and pushed it to the scope.
It has been determined for a long time. The noise is caused by the design of the execution. Air raid sirens are designed according to this principle.
Some fans whine at certain pwm frequencies. Are you saying that you know for a fact that this is not a contributing factor in DHO800 oscilloscopes?
This is a well known problem in the diy 3d printer community. A quick search shows this has been discussed here too. At least one thread here has a better test suggestion. Instead of using pwm, use a variable power supply to see if it reduces the fan noise.
Eg. https://www.eevblog.com/forum/beginners/filtering-pwm-to-smooth-dc/Why complicate it? It's much simpler. You take the fan out of its socket and realize that it is not making noise)) You can easily find information on how an air alert is set up on Google. I screwed an external cooler to Rigol, and no PWM prevents it from working quietly. Take a look and everything will become clear. In the photo there is an air raid siren
I never suggested removing the fan, just connecting it to a different power source. Taking the fan out of the case may change how it resonates.
Anyhow as the sound doesn't bother me at all, I won't be opening mine. I was trying to offer something to try which may offer a less physical hacking way to reduce the sound for those who it does annoy. For all I know the fan runs on DC rather than PWM.
On the second day after the purchase, I was looking for an interference in the amplifier. The growl of the DHO cooler drowned out the sound of the speaker for me. And it was very annoying. Without hesitation, he opened, removed this ratchet and put on an external cooler. And if you listen to this nightmare all day, your head will be square by evening. 7 coolers in my computer are almost inaudible, and one DHO roars like a bike. ))
On the second day after the purchase, I was looking for an interference in the amplifier. The growl of the DHO cooler drowned out the sound of the speaker for me. And it was very annoying. Without hesitation, he opened, removed this ratchet and put on an external cooler. And if you listen to this nightmare all day, your head will be square by evening. 7 coolers in my computer are almost inaudible, and one DHO roars like a bike. ))"coolers"? Is each "cooler" a fan? If you can't hear 7 fans running then I suspect they are all running at like 200rpm.
Noise comes from mostly airflow. To get some flow from a tiny fan it needs to run fast rpm's. More flow + smaller fan, is a catch-22 design in terms of noise. Bigger fan blades can 1) run slower, and 2) have better designed blades to help mitigate wind noise. But sometimes physical size and costs become more of a factor when the noise is still in that "acceptable" range.
Pop open case, inline a resistor with the tiny fan, install a 90x15mm on ext side. That's what I will do, but I have more to do along the way, gonna be testing the noise on the provided usb-c psu, then I will add some filtering. I will skip doing any PWM control on the ext fan side to avoid any harmonics stuff since I will split the usb-c to power both DHO and ext fan, so just gonna use a generic pot to slow the ext fan into the right flow.
I'm not sure what went wrong with my previous upgrade attempts, because I sent the identical string, but I tried it again after power cycling the DHO914S and it worked!
Unlike the other Rigol scopes I have, the BW upgrade doesn't show up as an option in the options list, but does show "Max BW:250M" in the "About" section.
Thanks to all who had the patience to help me with this!Hi, I order a 914s from China and it is on the way. Can you post steps to upgrade to 924s in detail?
On the second day after the purchase, I was looking for an interference in the amplifier. The growl of the DHO cooler drowned out the sound of the speaker for me. And it was very annoying. Without hesitation, he opened, removed this ratchet and put on an external cooler. And if you listen to this nightmare all day, your head will be square by evening. 7 coolers in my computer are almost inaudible, and one DHO roars like a bike. ))"coolers"? Is each "cooler" a fan? If you can't hear 7 fans running then I suspect they are all running at like 200rpm.
Noise comes from mostly airflow. To get some flow from a tiny fan it needs to run fast rpm's. More flow + smaller fan, is a catch-22 design in terms of noise. Bigger fan blades can 1) run slower, and 2) have better designed blades to help mitigate wind noise. But sometimes physical size and costs become more of a factor when the noise is still in that "acceptable" range.
Pop open case, inline a resistor with the tiny fan, install a 90x15mm on ext side. That's what I will do, but I have more to do along the way, gonna be testing the noise on the provided usb-c psu, then I will add some filtering. I will skip doing any PWM control on the ext fan side to avoid any harmonics stuff since I will split the usb-c to power both DHO and ext fan, so just gonna use a generic pot to slow the ext fan into the right flow.No, they work at a normal speed. Usually about 60%. When rendering, the coolers are at 100%. The loudest ones are on the video card. And it's quieter than DHO. It's just that when the cooler started making sounds on the Zalman power supply after a year of operation, I replaced it with Be Quiet. Noctua was installed on the processor after a year of operation. The cabinet ones also Be Quiet. It's just about the quality of the coolers. Only the air flow is audible. In DHO, with this design, the quality of the cooler does not matter. Do you want to slow it down? There is already 8V, usually the coolers start rotating starting from 5V. In addition, even at 8V in the DHO settings, you can see a temperature of about 60C. It's not critical, but it's not 40 anymore. Now I have a maximum temperature with an external cooler that I have seen- 55C. And silence. I bought DHO for comfortable work, and if the warranty prevents it, then I don't need it.
Yes, I simply modded my 804 vendor.bin to a 924 one and pushed it to the scope.
Here are few other things that might be of use:
1) Setting HDMI resolution - on DHO800 line there is no direct menu item to set the resolution - for some reason my monitor got 1920x1200 and the output did not look right - here is a quick fix:
Much easier: Tap the "about" button three times and you get settings for the HDMI resolution.
rigol_vendor_bin shows info about the provided vendor bin, if no other arguments are provided. If you provide -m and a model name, it will create new vendor.enc file with new model based on the provided vendor.bin. Now you need to rename vendor.enc to vendor.bin and push to your scope. Have you RTFM? That is how I modded my vendor file.
Question about that rigol bin tool.
When using the -o option to gen all the scpi options, is it specific to hardware version (dho800 vs dho900), or specific to the vendor.bin version?
Eample, my 804 is now a 914 via just the vendor bin mod using the tool. But do I gen options for DHO800 or DHO900 ? The hardware is still "12" for DH800, not an "8" for DHO900, as seen in UTIL --> ABOUT.
The tool generated a ton of scpi option strings, but obviously not all of them will apply to the 800 hardware, so which ones are the useful ones?