Hello everyone, I am the developer of DPOS350P and DPOX180H - Page 1
Forum section: electronics / testgear

author: yangyao
author_rank: Regular Contributor
timestamp: April 08, 2025, 02:56:43 am
content: Hello everyone, I am the developer of DPOS350P and DPOX180H, and I would like to communicate with you more，Responsible for all of software + FPGA + hardware

author: yangyao
author_rank: Regular Contributor
timestamp: April 08, 2025, 03:03:23 am
content: 1GS 350MHz oscilloscope

author: david300m
author_rank: Newbie
timestamp: April 08, 2025, 03:41:09 am
content: Looks interesting, especially for the price. Curious, what is the OS? Thanks for sharing.David

author: Atlan
author_rank: Frequent Contributor
timestamp: April 08, 2025, 04:08:03 am
content: No OS has it.Why doesn't the 350 have an RTC module? The entire oscilloscope menu looks like a copy of the 1013D.The price is high, especially when we don't know the actual parameters. And it also lacks an external trigger input.

author: yangyao
author_rank: Regular Contributor
timestamp: April 08, 2025, 05:10:06 am
content: 和1013D没有任何关系，采用的全新软件架构设计的

author: Atlan
author_rank: Frequent Contributor
timestamp: April 08, 2025, 05:36:23 am
content: OK. What is the maximal sampling rate? How many signal samples per channel will the fpga take?

author: RAPo
author_rank: Super Contributor
timestamp: April 08, 2025, 06:41:32 am
content: Can we send you requests for enhancements?One big request: please open the file formats the devices save.

author: Atlan
author_rank: Frequent Contributor
timestamp: April 08, 2025, 07:55:09 am
content: I don't know if it was necessary to start a new thread about the oscilloscope.https://www.eevblog.com/forum/testgear/new-oscilloscope-from-fnirsi-dpos350p/

author: RAPo
author_rank: Super Contributor
timestamp: April 08, 2025, 09:02:03 am
content: The OP stated that (s)he is involved in the DPOX180H and DPOS350P and is willing to communicate with us.I think that is something to be applauded for and deserves its own thread.Quote from: Atlan on April 08, 2025, 07:55:09 am

author: ptluis
author_rank: Frequent Contributor
timestamp: April 08, 2025, 09:09:30 am
content: Quote from: RAPo on April 08, 2025, 09:02:03 amLet's hope this is true, and not another way of marketing the new model. If he is really the developer he will get my support, those two devices could be improved greatly.

author: yangyao
author_rank: Regular Contributor
timestamp: April 09, 2025, 07:50:23 am
content: The entire oscilloscope was developed by me independently. The main reason is that my dealer’s price is high, and I have no control over it. The price is much higher than I expected.

author: ptluis
author_rank: Frequent Contributor
timestamp: April 09, 2025, 09:14:28 am
content: Quote from: yangyao on April 09, 2025, 07:50:23 amI completely agree, the price is too high, I've seen prices of €400, which is completely ridiculous when we have oscilloscopes with functions such as decoders, much more memory, superior features. If this product costs around €100, it will definitely sell a lot, if what is advertised works correctly. And if the developer implements and corrects the suggestions presented to him, he will certainly have a best seller on his hands.

author: Atlan
author_rank: Frequent Contributor
timestamp: April 09, 2025, 10:32:12 am
content: On bangood the price is 240E, which is a high price. because we don't know what parameters it actually has. Interestingly, I still haven't received an answer regarding the sampling frequency. Even the promotional video is so that nothing is visible there. And apparently the developer doesn't answer questions. Just a classic Fnirsi tactic, the main reason why not to buy a device from fnirsi.

author: Fire Doger
author_rank: Regular Contributor
timestamp: April 09, 2025, 09:22:15 pm
content: For a single person it's amazing, good job!At my workplace we investigated the possibly to buy low cost scopes and send them to remote working developers.DPOS350P was my vote because it doesn't look like a "toy" and maybe is noob friendly but unfortunately there are no in depth reviews and teardown.

author: ptluis
author_rank: Frequent Contributor
timestamp: April 10, 2025, 12:24:54 am
content: Quote from: Fire Doger on April 09, 2025, 09:22:15 pmReviews will probably only be available in May because they haven't started distribution yet and it seems that they will only start shipping orders during the second half of April.

author: Fungus
author_rank: Super Contributor
timestamp: April 10, 2025, 01:43:22 am
content: Welcome to the EEVBLOG forums!Have you read them in the past?

author: yangyao
author_rank: Regular Contributor
timestamp: April 11, 2025, 09:35:44 am
content: this is fact bandwidth test

author: yangyao
author_rank: Regular Contributor
timestamp: April 11, 2025, 09:37:12 am
content: The actual bandwidth is around 400M

author: DaneLaw
author_rank: Frequent Contributor
timestamp: April 11, 2025, 08:21:32 pm
content: Quote from: yangyao on April 11, 2025, 09:37:12 amFnirsi tends to have a quite "relative" view on "bandwidth".. at least in the past..*but but' you can still see the waveform, at that frequency = It's the bandwidth.Are you referring to an attenuated 3 dB droppoint? (70.7% of a signal's amplitude) ?

author: aleksandrs
author_rank: Contributor
timestamp: April 14, 2025, 05:24:07 pm
content: Hello! Thank you for giving us the opportunity to talk to you about these great products, it's really valuable!I have a DPOX180H on its way to me.I have a few questions, please answer them if possible.1) Here in this video review:https://youtu.be/9i_4Eu887gU?si=kZSLi12ISzpr8gXf&t=295(it's in Russian, but the subtitles seem to translate well)They say there's a problem with compensation with an open and closed channel up to 10 MHz. Many people in the comments say that the problem does exist, and they also write that it can be solved by soldering a 100 pF capacitor. Is this a problem you know about?2) Is it planned to add a scale for measurement to the FFT spectrum function? (a cursor would be an ideal solution)3) At a low sweep speed, the oscilloscope behaves like an analog one, i.e. the graph is drawn from left to right, then the graph is erased and starts to appear again. This is close to what would be on analog oscilloscopes. But this is not convenient when you need to catch an unpredictable transient process that is not caught by a trigger. It would be cool if you added a mode in which the signal curve is continuously generated on the right side, and its history shifts to the left. Is there a chance that you will add such a mode?4) I really miss the infinite afterglow as it is on younger models like 2C53P, it was really super convenient for catching single very fast events.Is there a chance that you will add this? (I understand that you did not work on 2C53P, but I assume that you are aware of its functionality)

author: yangyao
author_rank: Regular Contributor
timestamp: April 15, 2025, 04:53:54 am
content: This was tested at an amplitude of 1VPP, using a coaxial line to connect the signal generator. The oscilloscope did not have an external 50Ω impedance (because there is no 50 ohm in actual use). The oscilloscope parameters showed the frequency and amplitude of the current signal. The bandwidth parameters of FNIRSI were indeed inaccurate in the past, and the -3db attenuation was not considered.

author: yangyao
author_rank: Regular Contributor
timestamp: April 15, 2025, 04:57:27 am
content: DPOS350P is an oscilloscope with further upgraded software and hardware architecture based on DPOX180H. It has a large part of similarity (only oscilloscope function)

author: yangyao
author_rank: Regular Contributor
timestamp: April 15, 2025, 04:58:30 am
content: DPOS350P completely beats FNIRSI-1013D, the two are basically unrelated

author: Fungus
author_rank: Super Contributor
timestamp: April 15, 2025, 05:45:59 am
content: Does it have serial decode ability?The ability to look at serial data is very important now.

author: Darkover
author_rank: Regular Contributor
timestamp: April 15, 2025, 06:03:14 am
content: I would say the biggest ability I miss on a new scope is an integrated interpreter for an easy language (Basic, Forth, Python, C) than can work with the sampled data. Look how many programs existed for an old calculater like a HP48 and what this would mean for the usability for a scope.Olaf

author: yangyao
author_rank: Regular Contributor
timestamp: April 23, 2025, 07:27:58 am
content: The post goes to another topic: I want to make a 1GHz bandwidth oscilloscope

author: ptluis
author_rank: Frequent Contributor
timestamp: April 23, 2025, 09:21:40 am
content: Quote from: Fungus on April 15, 2025, 05:45:59 amNo, that's why 200+ euros is too much

author: aleksandrs
author_rank: Contributor
timestamp: April 23, 2025, 09:55:25 am
content: Quote from: yangyao on April 23, 2025, 07:27:58 amThe idea of ​​creating a new oscilloscope is cool! But will there be software updates for the DPOX180H since it still has problems. Or is their support cycle already over?

author: pascal_sweden
author_rank: Super Contributor
timestamp: April 23, 2025, 10:02:23 am
content: Do you look for people that want to participate in the development of the product?It would be cool to help with the development. Do you have a website?

author: tunk
author_rank: Super Contributor
timestamp: April 23, 2025, 10:06:56 am
content: Quote from: aleksandrs on April 23, 2025, 09:55:25 amA post from another thread from a person who says he developed it:"DPOX180H does have some problems. Why haven't I updated it? Because the salesare too terrible. The dealers sell it at a very high price. A handheld oscilloscope can'tsurvive at this price. So I have given up on DPOX180H and haven't produced it fornearly a year."https://www.eevblog.com/forum/testgear/hello-everyone-i-am-going-to-make-a-very-low-priced-1ghz-oscilloscope/msg5889030/#msg5889030

author: aleksandrs
author_rank: Contributor
timestamp: April 23, 2025, 10:17:49 am
content: Quote from: tunk on April 23, 2025, 10:06:56 amThanks for pointing this message!Too bad I didn't see it before I ordered this oscilloscope

author: yangyao
author_rank: Regular Contributor
timestamp: April 24, 2025, 01:38:06 am
content: This is the mainboard of DPOS350P

author: ptluis
author_rank: Frequent Contributor
timestamp: April 24, 2025, 05:23:40 am
content: Quote from: yangyao on April 24, 2025, 01:38:06 amFirst thanks for sharing the photos, may I ask why there's no persistence mode? and no decoders?

author: dibu
author_rank: Contributor
timestamp: April 28, 2025, 12:02:47 pm
content: great job, i like the openness and being present here, i like this product, nice choice of components, please make it open source, or at least open as much as possible, it will help sales a lot, i will definitely buy it, it's a bit expensive tho

author: ptluis
author_rank: Frequent Contributor
timestamp: April 30, 2025, 04:40:49 pm
content: Quote from: yangyao on April 08, 2025, 02:56:43 amHello since you claim being the developer of dpox180h could you kindly explain how to manually calibrate the dpox180h? After performing the calibration through the menu, the values ​​measured on ch1 and ch2 are differentfor example sinewave of 2Vpp:ch1 = 2.1Vppch2=2.6VppDc signal of 5V:ch1=4.99Vch2=5.4Vhow can I calibrate ch2 so that it is equal to ch1?

author: ptluis
author_rank: Frequent Contributor
timestamp: May 02, 2025, 10:32:52 am
content: Well seems like I'm not going to get an answer from the "developer", guess why?

author: Atlan
author_rank: Frequent Contributor
timestamp: May 02, 2025, 06:44:52 pm
content: You have to wait a while, he is currently working on improving the reputation. So there will be new firmware for 1013D, 180, dso153 and others

author: pcprogrammer
author_rank: Super Contributor
timestamp: May 03, 2025, 06:07:45 am
content: Or all the negative responses drove the OP away.I hope they come back, to at least discuss their latest development, the 1GHz bandwidth scope.https://www.eevblog.com/forum/testgear/hello-everyone-i-am-going-to-make-a-very-low-priced-1ghz-oscilloscope/

author: pcprogrammer
author_rank: Super Contributor
timestamp: May 03, 2025, 06:13:53 am
content: Quote from: dibu on April 28, 2025, 12:02:47 pmThat is debatable. The Gowin FPGA is ok, but why not one that has internal SDR or DDR SDRAM. With 8MB of sample memory the scope would have been so much better. And the ADC, why 4 dual 125MSa/s ADC's instead of a single 1GSa/s ADC. The amount of passive components in the analog front end, are they really needed, and whats up with all the coils in the power supply. Over engineered maybe?

author: Sorama
author_rank: Frequent Contributor
timestamp: May 03, 2025, 07:07:59 am
content: Quote from: ptluis on May 02, 2025, 10:32:52 amand who would be to blame?guess why...

author: ptluis
author_rank: Frequent Contributor
timestamp: May 03, 2025, 09:46:15 am
content: Quote from: Sorama on May 03, 2025, 07:07:59 amOnly the developer for sure (although I think it's not what he claims to be), since he only come here to promote is creations and never answer direct questions about firmware bugs, that every customer owner has the right to ask as soon as he present himself as the creator!What's even more ridiculous is admitting that previous models are toys developed for kids, meaning all that talk about those devices being serious tools are bull ... like every owner realized.Summarizing, the developer doesn't even care to defend himself and gain trust and confidence from current and prospect buyers.And finally every developer must be prepared to receive bad feedback, and if he is really serious about his work, defend himself and release solutions.I found strange the fact that he his bypassing the agreement with the distributor and making serious claims like toys, devices with prices too high, that price should be low, and so on. And of course prices should be really low, we're buying products that are to "use and throw away" with really low QC.And don't worry he won't give up building his new 1GHz scope, every year there's a new model released with 1 or 2 more desired features, with all the bugs included and mad people opening new posts and spitting hell and fire

author: aleksandrs
author_rank: Contributor
timestamp: May 03, 2025, 09:57:56 am
content: Quote from: ptluis on May 03, 2025, 09:46:15 amUntil the moment when a message appears from Fnirsi like "our account was hacked"/"Competitors are throwing mud at us on our behalf", there are: 3, 2, 1 ...(In general, if they do this and roll out good software updates as an excuse, I will even be happy)

author: dibu
author_rank: Contributor
timestamp: May 03, 2025, 03:39:17 pm
content: Quote from: pcprogrammer on May 03, 2025, 06:13:53 amI guess costs is the main reason, but clearly this is a toy, just as all the previous ones, i wouldn't care at all if it were more open, sell it as a 'development kit', the problem with this 'one man shows' is that you get the features as is with great exaggerations on the specs, with 0 hope on updates, the scope is barely lunched, yet it seems to be abandoned already, the developer is already working on the next big thing.If it were more hackable, DIY friendly, the community could fix/improve things, but it seems that the focus is more on having encryption chips and locking down everything.I don't mind that it is a toy, at this price point i expect a toy, but if it is a toy i expect that i can 'play' with it, i'm not buying efused/encrypted e-waste.If i would want something more professional then I would not be looking at fnirsi at all.

author: pcprogrammer
author_rank: Super Contributor
timestamp: May 03, 2025, 04:10:22 pm
content: Quote from: dibu on May 03, 2025, 03:39:17 pmThe Hantek DSO2D10 I bought was and still is cheaper than this new DPOS350P, and it has a rebranded Gowin GW2AR-18 with 64Mbit PSRAM, and a obfuscated ADC08D500 that does the 1GSa/s for a single channel, and 500MSa/s for 2 channels.Development would have been simpler and less components would have been needed in the analog front end, so not so sure about the cost issue here. In my eyes it is dumb design choices.Quote from: dibu on May 03, 2025, 03:39:17 pmI'm not sure if it is possible with this FPGA to lock it from loading a new configuration and writing it to the internal flash. If so, yes it would render it basically useless from a hacking stand point.Unless the developers learned from their previous failures and improved on their FPGA skills, there is a big chance that the FPGA design sucks anyway.It would be certainly nice if they decided to develop these kind of things as a development kit. Maybe not open source the software and the FPGA design, but do it for the hardware. Release the schematics and allow users to create their own software.But for me, not this one. To limited sample memory wise and the ADC setup sucks. Would have made some sense if it was a 4 channel scope with 1GSa/s, 500MSa/s or 250MSa/s, or even a 8 channel scope with 125MSa/s. Screen would be a bit small for 8 though.Quote from: dibu on May 03, 2025, 03:39:17 pmThat is certainly true, but it will definitely cost more money.

author: dibu
author_rank: Contributor
timestamp: May 04, 2025, 09:00:04 am
content: QuoteThe Hantek one seem to offer a lot more functions and is cheaper too, it is always good to have alternatives

author: pezcat19
author_rank: Contributor
timestamp: May 11, 2025, 11:49:07 am
content: Hello Yangyao.I have owned the DPOX180H for over a year, and I have also just ordered the new DPOS350P to try it out.Regarding the DPOX180H firmware, I have the following questions / suggestions:1 -Is it possible for you to make the Voltage ranges (vertical scale) adjustable in very small steps, and not just the large "preset" voltage levels? For example, when monitoring an AM carrier, I need to be able to adjust the captured waveform to fill up 1 or 2 graticals on the screen. At the moment, there is no way to adjust the scope to fit/adjust the waveform size correctly, because it only moves in large steps.2 -Can the Trigger type (Auto, Normal, Single, etc) be remembered on the startup / power ON please? At the moment it always goes back to AUTO trigger mode, but I want it to remember my last trigger settings, (for example, the trigger level, and also the trigger type, such as "Normal" mode.)Would you be able to update the firmware to include these changes?Thanks in advance!

author: Atlan
author_rank: Frequent Contributor
timestamp: May 11, 2025, 11:50:24 am
content: but

author: pcprogrammer
author_rank: Super Contributor
timestamp: May 11, 2025, 12:42:02 pm
content: Quote from: pezcat19 on May 11, 2025, 11:49:07 amBased onYangyaotheir profile, there has been activity today, but only for reading. Has not responded since April 25th, so don't hold your breath.Further more they also indicated to have abandoned the DPOX180H due to low sales volume, so don't count on any improvements any time soon.See:https://www.eevblog.com/forum/testgear/hello-everyone-i-am-going-to-make-a-very-low-priced-1ghz-oscilloscope/msg5889030/#msg5889030

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 11, 2025, 12:45:12 pm
content: Quote from: dibu on May 04, 2025, 09:00:04 amAbandoned by Hantek, most bugs still there for 5 years already.

author: pezcat19
author_rank: Contributor
timestamp: May 11, 2025, 11:47:45 pm
content: @pcprogrammerthanks for the info - hopefully FNIRSI (and all others in this space) will come to understand that providing support and firmware updates for their products is the exact thing they need to do, to increase sales on products like the DPOX180H. For the money, it is honestly a nice little machine that is let down with some firmware limitations. If these were fixed, I'm sure the sales would grow!I hope that @Yangyaocan see past the negativity in some of the posts and take the constructive criticism from all this, because for a single person it's an outstanding effort what he has done IMO, but the lack of ongoing firmware updates / support are the issue for FNIRSI sales at present... Hopefully the DPOS350P won't go the same way as the DPOX180X.@DavidAlfa- just a quick THANKYOU for your work on the Hantek DSO2D15, which I also own and I have referred to your information many times to improve mine. Cheers!

author: RAPo
author_rank: Super Contributor
timestamp: May 12, 2025, 06:16:18 am
content: I think this is going in the wrong direction.It is a fiery market, and technology is changing fast.That means devices will get the character of being thrown away after some time: the companies are not there for you, but you are there for them. If you want more enduring support, there will be a premium on the price.That decision is entirely yours, but you must factor it in when you are searching for what is best for you.Quote from: pezcat19 on May 11, 2025, 11:47:45 pm

author: Sorama
author_rank: Frequent Contributor
timestamp: May 12, 2025, 06:54:27 am
content: Quote from: RAPo on May 12, 2025, 06:16:18 amI completely agree.While most people here have a (technical) wishlist and some even think they can make development decisions, those (small) companies offer one shots which come at a low cost.If that doesn’t suit you, you will have to adapt your budget (choose one of the bigger players).But don’t be so naive thinking they are there for you.

author: pezcat19
author_rank: Contributor
timestamp: May 12, 2025, 07:34:54 am
content: Yeah, nah, that's not what I meant... I'm only hoping they improve, I'm not demanding anything of anyone. My bench contains a few brand new pieces of gear, where a single software license alone can cost more than these FNIRSI units combined! This is not about choosing the right product for my budget. I buy this cheaper stuff because I enjoy messing with it. My comment about firmware updates comes from my observation that FNIRSI are marketing themselves more aggressive (better?) than they used too (other than the specs lies that are still creeping in! 16bit? lol). That combined with the statement they made about not selling enough of the DPOX180X. I believe if the firmware support was better, even with a higher price point, they would do better.

author: ptluis
author_rank: Frequent Contributor
timestamp: May 12, 2025, 11:16:32 am
content: Quote from: pezcat19 on May 12, 2025, 07:34:54 am16bit more like average to display a nice signal, meaning what you see is more like a lie

author: pezcat19
author_rank: Contributor
timestamp: May 12, 2025, 11:23:04 am
content: Yes agreed. Although the spec sheet I read did say 8bit, so I assume this is the result marketing doing their thing...

author: pezcat19
author_rank: Contributor
timestamp: May 22, 2025, 09:44:14 am
content: Here is the first user video to appear on YouTube of the DPOS350P. (Use auto-translate for the captions)

author: KungFuJosh
author_rank: Super Contributor
timestamp: May 22, 2025, 12:43:27 pm
content: Quote from: pezcat19 on May 22, 2025, 09:44:14 am"Includes Paid Promotion" 🤔

author: ptluis
author_rank: Frequent Contributor
timestamp: May 22, 2025, 01:04:56 pm
content: Quote from: pezcat19 on May 22, 2025, 09:44:14 amOnly greek language available at least on my phone

author: pcprogrammer
author_rank: Super Contributor
timestamp: May 22, 2025, 03:56:05 pm
content: A couple of days ago, the same video was already mentioned here:https://www.eevblog.com/forum/testgear/new-oscilloscope-from-fnirsi-dpos350p/msg5918612/#msg5918612

author: cheater
author_rank: Regular Contributor
timestamp: June 03, 2025, 05:51:25 am
content: Hey there!I really like your scope, and I would have bought it already, with one limitation. I mainly need an oscilloscope for audio work, which means I need FFT as well as bode plot functionality down to DC. I was wondering why this model was designed to have those functions start at relatively high frequencies?Thanks

author: ptluis
author_rank: Frequent Contributor
timestamp: June 03, 2025, 09:14:51 am
content: Quote from: cheater on June 03, 2025, 05:51:25 amMy guess is Low Memory Depth meaning it must drop Sampling Rate to a point where it can't capture enough data to display a real signal, it will miss details in the signal.

author: velow
author_rank: Newbie
timestamp: June 25, 2025, 05:55:15 pm
content: It arrived at home today! I would like to know how to update firmware (I downloaded iso from the website). And how to know the version installed.

author: Grandchuck
author_rank: Super Contributor
timestamp: June 25, 2025, 06:51:11 pm
content: To install the firmware, enter the "System" menu and enter the "USB connect" mode. A new drive will appear in File Explorer (Windows). Copy the .iso firmware file into the root of this drive. Power the scope OFF then ON again, and it will automatically detect the new firmware file and install it automatically.

author: velow
author_rank: Newbie
timestamp: June 25, 2025, 07:23:06 pm
content: Quote from: Grandchuck on June 25, 2025, 06:51:11 pmDone!. Thank you so much!.

author: hatte
author_rank: Contributor
timestamp: June 30, 2025, 12:44:47 am
content: Could anyone explain how/why the decision was made to use a USB-C port for powering/charging the DPOS350P, but not supporting USB Power Delivery, and instead requiring an adapter that supports QuickCharge at 12V.

author: wolferl1210
author_rank: Contributor
timestamp: June 30, 2025, 06:04:20 am
content: Quote from: hatte on June 30, 2025, 12:44:47 amA matter of design. Using 5 Volt allows only to charge batteries with a lower voltage. Otherwise extra electronic with astep up converter (?) must be in the circuit. If more power is required, the batteries are stacked and therefore need 12 Volt.Not a big deal, zillion of USB power supplies deliver voltage according to QC standard (QC 2. and above). Most of the timethey are fited with orange sockets - and the QC voltages are printed on their covers too.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: June 30, 2025, 11:01:11 am
content: Quote from: hatte on June 30, 2025, 12:44:47 amMost vendors tend to go around Qualcomm QC standards.. as it is a properietary charge standard that costs money to implement, while fx Power Delivery (PD) is free (open standard)That is usually the claim, but it's a little more detailed.with PD, its free in regards to pr unit royalty-fees, but I believe you need to be part of USB-Implementers Forum [USB-IF].. that comes with some annual fees for the USB-IF membership. 6k $, plus another 3.5k $ if you wanna use the USB LOGO.So for small batch production.. Qualcomm's Quick-Charge protocols, and pay royalty-pr-unit.. can perhaps be cheaper, not least if it's on some of the older legacy variants of QC.

author: syau
author_rank: Frequent Contributor
timestamp: July 01, 2025, 02:15:51 pm
content: Quote from: hatte on June 30, 2025, 12:44:47 amAgreed that this design is annoying, tried few USB power adapter with “orange” QC3.0 which neither works.

author: wolferl1210
author_rank: Contributor
timestamp: July 01, 2025, 08:01:57 pm
content: Quote from: syau on July 01, 2025, 02:15:51 pmorange color is not the QC standard. Try to read what it says on the fine print on the power supply.If it says QC and lists 12V all fine - is that so difficult ? You try to operate a 2 Ch 300 Mhz scope with FRAand other bells and whistles, but you stumble over such simple issues.

author: wolferl1210
author_rank: Contributor
timestamp: July 02, 2025, 08:58:26 am
content: In addition to verifying that the charger for the DPOS350P is capable of supplying QC 12 volts,a USB cable equipped with data lines is required. Cheap "charger cables" often provide onlythe two wires for 5-volt power and lack the necessary data wires.For 12-volt operation, Quick Charge 3.0 (QC 3.0) will configure the data lines to 0.6 volts,which signals the power supply to output 12 volts instead of 5 volt on the power wires..

author: Grandchuck
author_rank: Super Contributor
timestamp: July 02, 2025, 01:16:42 pm
content: Hello yangyao. Thanks for extending the FRA to 10 Hz. Some other changes that would be nice:1/ correction (inversion) of the phase plot2/ expand number of log cycles graphed: 10, 100, 1000, 100003/ employ waveform averaging (user selectable?)

author: pezcat19
author_rank: Contributor
timestamp: July 03, 2025, 12:24:05 am
content: @Grandchuck - I am seeing the same phase inversion results as you.

author: Grandchuck
author_rank: Super Contributor
timestamp: July 03, 2025, 11:19:27 am
content: Quote from: pezcat19 on July 03, 2025, 12:24:05 amIt should be an easy fix ... let's hope for a firmware update

author: Grandchuck
author_rank: Super Contributor
timestamp: July 03, 2025, 02:53:43 pm
content: I decided to scrutinize the accuracy of the Fnirsi Bode plot. I increased the frequency count to 500 and used the cursors. Rather nice!Sloooow at 500, BTW.

author: youmax
author_rank: Newbie
timestamp: July 28, 2025, 06:58:45 pm
content: Hi, anyone have lastest firmware for test please?, dont see where is for download. thanks!

author: tunk
author_rank: Super Contributor
timestamp: July 28, 2025, 08:47:43 pm
content: Firmware for what?Maybe here:https://www.fnirsi.com/pages/manuals-firmwares

author: youmax
author_rank: Newbie
timestamp: July 28, 2025, 09:22:40 pm
content: yes, you are right! for DPOS350P , thanks!

author: BHershey
author_rank: Newbie
timestamp: August 02, 2025, 09:02:58 pm
content: The problem is at least in my case, it wont connect to WIN11, and there is no USB driver available for it.

author: BHershey
author_rank: Newbie
timestamp: August 02, 2025, 09:05:09 pm
content: Dows not connect to Windows 11 and no USB driver. Just is what it is and can never be updated to images downloaded

author: hatte
author_rank: Contributor
timestamp: August 03, 2025, 12:17:40 am
content: Kerry Wong has just published a review video of the FNIRSI DPOS350P.Criticisms include the usual suspects (non-standard USB-C supply requirements, noisy fan, UI bugs and inconsistencies).https://youtu.be/nILiuOlv9V8

author: shabaz
author_rank: Frequent Contributor
timestamp: August 03, 2025, 01:25:55 am
content: I watched a fair bit of the video (I might be interested in purchasing a portable 'scope one day, just not yet) and my personal conclusion from that video is that you couldn't really trust the results shown by the instrument, unless you'd confirmed them with a normal 'scope first. In other words, maybe it's useful for verifying signals that you're already aware of what to expect, but beyond that, you'd always be wondering if there is an instrument issue or not.It was hard going, the video is mostly out of focus unfortunately.The PCB layout looks quite ugly (everything laid out on a grid) which might explain why (say) the FFT output wasn't great. The FFT looks mostly unusable. The multiple ADCs might have something to do with that too.I don't know how much this device costs, but I wouldn't spend more than $100 on it. I think some FNIRSI equipment is nice however, I'm just not confident enough about this one, and I doubt some of the issues can ever be resolved by firmware updates alone.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 03, 2025, 02:32:34 am
content: I only now see this thread, I had not realized this was from fnirsi.At the moment, my opinion of fnirsi is extremely negative. The fnirsi gadgets look good, mechanically they seem pretty solidly built, the prices are unbelievably low, but they also blatantly lie in their specifications. Every time I see a somewhat in-depth review of a fnirsi gadget I see extremely gross errors that simply should not be there. From hiding artifacts by averaging multiple tracks on a scope (Does that white desktop scope even have single trigger? And also other weirdness.I very much doubt that this dpos350 has a real 16bit ADC. And that's OK, nobody expects 16-bit ADC's on an oscilloscope, and certainly not in this price range. And it's nice if you have some high-res mode with averaging in which you can approximate 16 bits of resolution, but then state in your manuals and advertisements what is is and what it does. Don't lie.As long as you're lying in your specifications, it's just a silly gadget. State real specifications and make it work reliably, and you can probably up the price a bit and people will still buy it.I have not seen the Kerry Wong review (He usually makes pretty good reviews), but as it stands, the text shabaz posted here is enough for me, and it exactly confirms what I have seen in previous reviews of fnirsi gadgets. This scope has the same dubious anti features as the other gadgets. Shabaz is generous. I would not even touch this scope if I got it for free.Quote from: shabaz on August 03, 2025, 01:25:55 amI don't know exactly where it goes wrong. Is the hardware simply not up to specs, and is the software hiding that on purpose? Maybe it's mostly software bugs that can be fixed over time. What I've seen of the 1014D is so disappointing that, at the moment, I simply can't take the brand seriously. Fix the serious issues with your equipment first before you put more gadgets on the market. For a scope with a (claimed) 350MHz bandwidth there are a bunch of expectations about signal quality and trustworthiness. If you can't match those expectations with real specifications, you are making gadgets and not test equipment.And overall, you've already got a lot going for the brand. It looks good, is reasonable solidly built, very small prices, but as long as you don't improve the actual functionality, it's "fnirsi gadgets" without a captital F, and not "Fnirsi test equipment". For this reason I'm completely disregarding the whole brand at the moment. Maybe you you will deserve the capital F in a few years, but watching reviews (often made by beginners who do not always recognize the lies / deficiencies) is just a waste of time at the moment. I am thinking of buying a handheld scope in the near future. I already have a quite capable Siglent scope, but I'd like a scope without a fan and one that can be use without a mains plug and that is also easier to move around and store. An Owon or Hantek with around 20MHz to 40MHz is what is on my short list at the moment, but no fnirsi stuff.

author: Grandchuck
author_rank: Super Contributor
timestamp: August 03, 2025, 02:51:06 pm
content: Quote from: BHershey on August 02, 2025, 09:05:09 pmAnother user in a different thread had the same problem and fixed it with a different USB cable:https://www.eevblog.com/forum/testgear/new-oscilloscope-from-fnirsi-dpos350p/msg5998687/#msg5998687

author: shabaz
author_rank: Frequent Contributor
timestamp: August 03, 2025, 04:21:51 pm
content: Quote from: Doctorandus_PThe hardware looks strange. There seems to be four ADCs to achieve the sample rate. I wish they had just simply gone for non-interleaved 100 MHz BW instead, kept it simple. Everything is weirdly laid out for instance, packed like Tetris pieces, see the attached DAC filter snippet as an example.. I think a combination of layout, and that h/w design, is causing all the nasty spurs on the spectrum display. A simpler instrumentthat works better would have been nice as a portable scope. They seem to have talented engineers for the enclosure, much of the software and so on, and maybe their PCB engineer just needed some guidance on the layout, but I think the actual hardware design isn't ideal, and not enough resources to software test, and to fix the bugs perhaps. And that tiny fan would irritate no end. I already have to work in a different room than my SBCs some of which have these small fans, because I can't take the noise they emit, and I'm sure I'm not the only one.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 04, 2025, 10:32:18 pm
content: Packing all the SMT passives so closely is not strange on itself, but it does mean you have no room left for routing, so that probably needs a few extra copper layers. It's the choice between PCB size or layers. But packing stuff that close probably does increase crosstalk, (or distortion if it's all within the same channel). But maybe two PCB's (and then each with fewer layers) would have been better, but I can't judge that from a distance.I also skimmed very quickly through the Kerry Wong review. @48:18 the ADC's are marked with "2445". So apparently the Chinese have progressed from grinding off part numbers to ordering the chips with custom part numbers (What HP and such did 40 years ago). But shame on fnirsi. It's not going to delay anybody who is interested in reverse engineering for more then a few hours, and it does make reviews much harder, and reduces trust in the brand. If I could see it had decent ADC's, I would have more confidence in the hardware, and I would be more inclined to believe that issues can (and hopefully will) be fixed. (How good is fnirsi with firmware updates?) For HP it was not an issue, because the brand had a well established good name and you could trust it. Not so much for a new and cheap chinese brand.Quote from: shabaz on August 03, 2025, 04:21:51 pmThat I completely agree with. "Low cost" nearly always coincides with bad user interface or broken functions, and that is a big bummer. Nobody in their right mind is expecting a 350MHz bandwidth scope in the (very) low cost market segment, but a tool that "just works", and works reliably would be very nice.Today I've been looking a bit deeper into the Owon handhelds. (Especially the HDS242S 40MHz is plenty, the Owon has good display update rate and other specs). And then I found out they completely *&^%$#@! the buttons. It's got left/right and Up/Down cursors, but those do not adjust the timebase and voltage scaling. And it's not just me, several youtubers find the buttons "confusing" or "hard to get used to". So that is end of my interest. Maybe I'll look deeper into the ZeeWei handhelds this week.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 06, 2025, 09:02:21 am
content: The following video shows how bad this device is in measurements, fra, spectrum analyzerhttps://youtu.be/WtcAMw8iR7s?si=RJsOct8_PIymBPXC

author: Kean
author_rank: Unknown
timestamp: August 06, 2025, 05:16:04 pm
content: Quote from: ptluis on August 06, 2025, 09:02:21 amThanks for the link. I've only watched the first 6 minutes, but I like this guy and his style.The English auto-dub isn't terrible, but I do wish I understood Polish especially considering my ancestry.

author: shabaz
author_rank: Frequent Contributor
timestamp: August 08, 2025, 07:34:49 pm
content: Quote from: Doctorandus_P on August 04, 2025, 10:32:18 pmBy coincidence I tried an Owon instrument for the first time a couple of months ago, a tiny DGE 1030 AWG.I was pleasantly surprised, it's for sure a bare-bones instrument functionality-wise, but I liked the price-performance-functions mix.I checked the output with an SA and signal quality was very good (worsens slightly past 200mV p-p due to the internal amplifier, plus could benefit from a bit more filtering), and it supports basic analog modulation, has a easy-to-use UI, and SCPI support via USB, so it's easy to automate things.The main reason I got it was because I didn't trust myself with a higher-end AWG on some circuits-under-test, I'd rather accidentally damage lower-cost equipment. But the instrument performs well enough I will make lots of use of it.If they did a little low-end battery-capable oscilloscope with thoughtful price-performance mix and a decent UI, I'd be interested. I don't think the DPOS350P has that thoughtful mix sadly.

author: Grandchuck
author_rank: Super Contributor
timestamp: August 08, 2025, 07:51:32 pm
content: The user interface, look, operation, and responsiveness of the Fnirsi are good. The price is reasonable.It is a good second scope and battery operation is a big plus. It has a very short learning curve. Perhaps future firmware upgrades will make it even better.Just my thoughts.

author: ststefanov13
author_rank: Regular Contributor
timestamp: August 10, 2025, 05:16:20 am
content: Another bug for yangyao: in zoom mode with vertical markers Dt and Df set, the metershows smaller values for Df and larger values for Dt than in the mode without zoom for a full period. This is with the latest firmware.Example of the generator 100Hz, amplitude 2v, in zoom mode Dt=25ms, Dt=39.9, it's coolApart from that, the markers stand in a different place.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 10, 2025, 08:37:18 am
content: Quote from: ststefanov13 on August 10, 2025, 05:16:20 amYou just have to live with it, the creator already leave the idea that this model has already been abandoned. They are working on a new scope model. If he release a new firmware it will be a miracle. You could use this scope to see something on screen and forget measurements because they are not consistent, also fra is 50% working, such as spectrum analyzer, and fft. It's too bad because if they dedicate a little more time fixing this device they will certainly sell a lot more. If source code be kindly released (of course it won't for obvious reasons) we all could fix the damn machine and they will profit a lot from sales. So we all have to wait for some genius to crack this thing and release a custom firmware.