Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
imyxh:
--- Quote from: ptluis on July 26, 2023, 09:31:55 pm ---I have found a new video showing a new bug/crash of this device when using the usb function. Try on your units to see if it happens.
https://youtu.be/NLNTrn9KVrk
--- End quote ---
Aha! I have this too on my Linux machine, but I fixed it.
After using Wireshark to capture the USB traffic, I found that the device was timing out after the host sent it an SCSI Read command, for 240 blocks. I then also found this: https://bugzilla.kernel.org/show_bug.cgi?id=219027
It seems like the DPOX180H can only buffer something like 128 blocks at a time over SCSI. Linux doesn't find out about this for interesting reasons (see bugzilla link) and the mass storage chip on the DPO fails to throw an illegal request error like it's supposed to but instead just completely crashes. This also explains the text disappearing afterwards. Windows is probably either playing it safe with low default maximum block limits or looking at the Block Limits VPD page.
So on Linux, one solution is to edit the udev rules like this:
--- Code: ---$ cat /etc/udev/rules.d/fnirsi.rules
# DPOX180H seems to have a transfer limit of something like 128 blocks
ACTION=="add|change", SUBSYSTEM=="scsi", ATTR{model}=="F1Cx00S Disk ", ATTR{max_sectors}="128"
--- End code ---
and then of course do udevadm trigger. After doing that I was successfully able to mount the scope as mass storage and flash a firmware update to it.
I don't have a mac so I can't help there, sorry. :P
ptluis:
Today I'm going to change my opinion about the dpox180h. I bought the first version and honestly I didn't like it, it froze a lot. I updated the firmware to 3.0 and the problems continued, mainly with the trigger, which in a certain sequence of operations was not possible to access the menu to change the trigger mode. I then decided to update the firmware to 4.0 and the oscilloscope got much better, there was no freezing since I installed it, the trigger menu bug was also solved, the waveform is finer and details are noticeable. I have used it to test sensors, single-phase and three-phase motors, controllers, signals from ECU and I must say that it is completely satisfactory. Therefore, the Fnirsi has risen in my consideration because it really fixed some of the problems and did not forget the first versions. In this last point, Zeeweii and its dso2512g took the wrong direction, where the first versions were set aside in terms of updates or improvements. There are about 3 or 4 different versions and when they make improvements they forget about the previous units and sell a new one. That's the deal. So it's only fair that I correct what I wrote in previous posts for those who consider my previous comments before deciding to purchase. Thank you, have a nice day :-+
RAPo:
Indeed and if you buy the new (yellow) version the pressing of the buttons will substantially be better. You don't need to buy a new scope only the casing.
ptluis:
--- Quote from: RAPo on September 05, 2024, 02:51:45 pm ---Indeed and if you buy the new (yellow) version the pressing of the buttons will substantially be better. You don't need to buy a new scope only the casing.
--- End quote ---
and where can i find the case? can you post a link? thanks
RAPo:
I can't find a product link. Will ask finirsi if they still sell it.
The upgrade video is here:
https://youtu.be/VsiZiW_2zy8
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