New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)

[ptluis]

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

ok thanks 👍

[ptluis]

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.

Do you know if the hardware of the second model is the same as the first one?  same pcb, components, etc?

[RAPo]

No I don't. I had an early blue DPOX and applied the yellow upgrade kit. The upgrade is hardware-independent.

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.

Do you know if the hardware of the second model is the same as the first one?  same pcb, components, etc?

[RAPo]

My contact at FNIRSI told me that no (yellow) shells are available.

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

ok thanks 👍

[ptluis]

My contact at FNIRSI told me that no (yellow) shells are available.

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

ok thanks 👍

Hello thank you for your time. Its not a big problem, the keys with some degree of usage are becoming soft.

[Dezmond2]

Guys, what conclusion for this toy for now? 
Real sample rate not 500MSps? Real BW 50-60?

[csuhi17]

Guys, what conclusion for this toy for now? 
Real sample rate not 500MSps? Real BW 50-60?

https://youtu.be/9-EHjiijSA0?si=4e3-Bn9dDtOr_Geo&t=275

[Dezmond2]

https://youtu.be/9-EHjiijSA0?si=4e3-Bn9dDtOr_Geo&t=275

I see BW 180Mhz is real...what about real sample rate...maybe count points on of zoomed wave...

[csuhi17]

I see BW 180Mhz is real...what about real sample rate...maybe count points on of zoomed wave...

No, they are just for decoration, maybe it helps in reading, but they are not the real samples.
I just measured it and there is about 400 ps between two points,
2.5Gsa/s?! yes yes for sure.
If I remember correctly, the teardowns revealed that the real one is 500MSa/s, but we don't know the real memory depth.

That's why I dared to buy the next version from them.
It's a big disappointment, Fnirsi hasn't come to its senses, it's still producing more and more waste.
But this DPOX180H is still in the usable category.
It should be taken into account that Fnirsi's support period is much shorter than that of other manufacturers.
If you're lucky, two updates will be released and that's it.
1 was released for the DPOX180H, not a single one was released for the 2C53P, but more pieces are coming...

[battlecoder]

https://youtu.be/9-EHjiijSA0?si=4e3-Bn9dDtOr_Geo&t=275

I see BW 180Mhz is real...what about real sample rate...maybe count points on of zoomed wave...

I don't think it's real. Based on the sampling rate and everything, it looks to me that they are doing a lot of interleaving to get to those numbers. I don't think it would behave well with a non-periodic waveform. At least based on my tests.

It's still a pretty usable scope and one of the best handheld scopes I've tried, but I do not think they fully meet the specs.

[csuhi17]

https://youtu.be/9-EHjiijSA0?si=4e3-Bn9dDtOr_Geo&t=275

I see BW 180Mhz is real...what about real sample rate...maybe count points on of zoomed wave...

I don't think it's real. Based on the sampling rate and everything, it looks to me that they are doing a lot of interleaving to get to those numbers. I don't think it would behave well with a non-periodic waveform. At least based on my tests.

It's still a pretty usable scope and one of the best handheld scopes I've tried, but I do not think they fully meet the specs.

500 MSa/s may be real, the fastest rise time measured with it was between 3 and 4 ns. I couldn't measure it more precisely, just by eye.
I was able to get a 4ns rise time with a single trigger. Which was the same on the Owon HDS2202.

Whichever principle you follow, a 500MSa/s scope will never be 180MHz, only for repetitive samples.
Bandwidth (Hz) = 0.35/rise time(s) or sampling rate/10 .

Rigol DG912Pro, pulse, 3ns Rise time, 1Hz.
IMAGE1 with Owon HDS2202
12 with the DPOX180H

One of my biggest concerns, besides the many bugs, is that it often freezes. No new firmware for almost a year?! forgotten project...
otherwise it can be used.

[Florentino]

Hello everyone.
I heard that when using high-quality probes, the oscilloscope errors are not so large. Surely there are people here who have expensive high-quality probes, have you checked their effect on the readings?

[any1ne]

Hello everyone. I bought myself such an oscilloscope. I immediately decided to replace these ill-fated capacitors. And here's what I found out. After replacing the capacitor in channel 2, I decided to compare them with each other. I connected a probe with a 1:10 divider, at a constant voltage and set it to 50 mV/division. And applied 5 volts from the power supply to the input of each channel. It turned out that in the channel in which I replaced the capacitor, after disconnecting from the power source, a self-oscillating process occurs. In the first one, in which the capacitors are original, it does not. Most likely, these capacitors perform some kind of filtering function, but are not separating. Although, maybe I'm wrong.

Video:

https://youtube.com/shorts/qMXeUA08IGU

[ptluis]

Hello everyone. I bought myself such an oscilloscope. I immediately decided to replace these ill-fated capacitors. And here's what I found out. After replacing the capacitor in channel 2, I decided to compare them with each other. I connected a probe with a 1:10 divider, at a constant voltage and set it to 50 mV/division. And applied 5 volts from the power supply to the input of each channel. It turned out that in the channel in which I replaced the capacitor, after disconnecting from the power source, a self-oscillating process occurs. In the first one, in which the capacitors are original, it does not. Most likely, these capacitors perform some kind of filtering function, but are not separating. Although, maybe I'm wrong.

Video:

https://youtube.com/shorts/qMXeUA08IGU

Hello I tried to replicate your problem but couldn't. I had the capacitor mod done like it was explained a few posts back. Maybe you have a different hardware version than mine. Mine is one of the first units to be released.

[csuhi17]

I also have one from the first series, and I replaced the capacitors with the recommended ones.
I also have the error.
I give the channel a low-frequency square wave signal, and it ripples at the top and bottom.
It is not noticeable above 60 Hz.
Something similar was mentioned in previous posts.
If you search for "capacitor" within the post, you'll find it easier.

And also that the two replaced capacitors are in the AC coupling circuit, so they should not distort the signal.

I can also produce this error by measuring a lithium battery.

But testing this in 50mV/Div with a 5Vpp signal...

[any1ne]

But testing this in 50mV/Div with a 5Vpp signal...

I chose this mode only to enhance the effect. At high V/div levels after I remove 5 volts from the input, the line also oscillates up and down, but with a smaller amplitude.

[ptluis]

I also have one from the first series, and I replaced the capacitors with the recommended ones.
I also have the error.
I give the channel a low-frequency square wave signal, and it ripples at the top and bottom.
It is not noticeable above 60 Hz.
Something similar was mentioned in previous posts.
If you search for "capacitor" within the post, you'll find it easier.

And also that the two replaced capacitors are in the AC coupling circuit, so they should not distort the signal.

I can also produce this error by measuring a lithium battery.

But testing this in 50mV/Div with a 5Vpp signal...

Ok i confirm this, the same effect

[aleksandrs]

Ok i confirm this, the same effect

Hello!
My oscilloscope is still on its way and I ordered the corresponding 100nf capacitors for it
Considering the effect found when installing such capacitors, does this mean that the 100nf capacitance is not suitable and another one should be selected?

[SHA_S]

... It turned out that in the channel in which I replaced the capacitor, after disconnecting from the power source, a self-oscillating process occurs. In the first one, in which the capacitors are original, it does not...

On the unmodified channel, the inadequate behavior of the oscilloscope "beam" is also clearly visible, it's just that the attenuation occurs much faster. To prevent this from happening, you should not overload the input stage with inadequate voltages for the given sensitivity. On the unmodified oscilloscope, this rule works perfectly and there are no self-oscillations at 50 mV or even at 5 mV.

[Bugi75]

Hi everyone,

I'm encountering a very specific and reproducible issue with the FNIRSI DPOX180H scope that seems to relate to internal channel crosstalk or grounding problems — possibly worsened by firmware or thermal effects.

Symptoms (Firmware V40):

After ~15–20 minutes of warm-up, when only CH1 is enabled, any waveform that crosses the center horizontal line (0V ref) starts getting modulated/distorted.

This happens even with clean signals from known good sources.

If CH2 is enabled, the problem goes away or is significantly reduced. It seems having both channels active changes the internal grounding or bias behavior.

The issue also appears when the signal touches that sensitive center area, even for a moment.

After full warm-up, even the idle flat line starts showing high-frequency parasitics when approaching the center of the display.

CH2 itself gets affected too, once active — the distortion moves to whichever channel is displaying a waveform near the center.

On V20 firmware, this behavior happens only when the battery is low, not when using external USB power. But V40 seems to exaggerate the effect even on USB power.


What I suspect:

This seems to be a combination of:

Grounding/reference drift after warm-up

Input buffer or ADC reference instability

Possible internal digital-to-analog coupling or layout flaw

Some users noted similar parasitic behavior at high timebase resolutions (e.g. 10ns/div) — this adds weight to internal layout or shielding flaws.


Has anyone else seen this?

Is there a known hardware workaround (internal grounding mod, capacitor, or shielding)?

Are FNIRSI aware of this issue?


I've tried:

All firmware versions (V20, V30, V40)

USB external power vs battery

Input termination, grounding, signal types, channel isolation


No resolution so far. FNIRSI has not replied for over two months.

Thanks in advance for any insight or confirmation.

Note: Tested two pieces product.

[csuhi17]

Hi everyone,

Are FNIRSI aware of this issue?
...
No resolution so far. FNIRSI has not replied for over two months.

Thanks in advance for any insight or confirmation.

Note: Tested two pieces product.

Yes and here is the answer from the developer.
He opened two new threads here to discuss his DPOS350P and next scope, but he didn't answer many things and I haven't seen anything news from him in a while.

DPOX180H does have some problems. Why haven't I updated it? Because the sales are too terrible. The dealers sell it at a very high price. A handheld oscilloscope can't survive at this price. So I have given up on DPOX180H and haven't produced it for nearly a year.

Even if they know about it, they don't care, they'll make the next 4GSa/s scope, and support for the older ones has been discontinued for the above reasons, if there was any at all.

[Bugi75]

Hi friend,

Thank you for your information.

This situation is very sad and unfair for device owners. They might have their own reasons, but a company that doesn't stand behind its products is not trustworthy. How do they plan to sell their future products and stay afloat? They have followed a very wrong policy; they will be the ones to lose.

Best Regards
Bugra

[pcprogrammer]

This situation is very sad and unfair for device owners. They might have their own reasons, but a company that doesn't stand behind its products is not trustworthy. How do they plan to sell their future products and stay afloat? They have followed a very wrong policy; they will be the ones to lose.

Well there is a sucker born every minute that thinks wow that looks like a nice cheap scope and buys it without reading or watching reviews, so the company won't suffer as long as the products are cheap enough.

Just take the 1013D and 1014D, even though fully exposed to be crap and have fraudulent specification, they still sell.

[Bugi75]

This situation is very sad and unfair for device owners. They might have their own reasons, but a company that doesn't stand behind its products is not trustworthy. How do they plan to sell their future products and stay afloat? They have followed a very wrong policy; they will be the ones to lose.

Well there is a sucker born every minute that thinks wow that looks like a nice cheap scope and buys it without reading or watching reviews, so the company won't suffer as long as the products are cheap enough.

Just take the 1013D and 1014D, even though fully exposed to be crap and have fraudulent specification, they still sell.

If you're calling me a sucker, I was one of the first people to buy the product. At that time, there weren't many reviews available. In the videos from early reviewers, it was said to be quite good for the price. The issues only started to show up with continued use, and we were expecting updates. Updates were released, but they weren't sufficient. Sometimes, they even made things worse. No one could have predicted from the start that the company would follow such a policy. Yes, they produce cheap devices, like many others. And no one expects top-level professional performance. But errors that reach the level of defects have nothing to do with the device being cheap. That’s called fraud.

Regards

[pcprogrammer]

If you're calling me a sucker....

No, I'm not, because that would make me a sucker too. 

I actually bought a second 1013D to be able to compare the behavior between the original firmware and the one I was writing. Also bought a 1014D just to see if it was any better.

The first 1013D I bought out of need for a small scope device to use while developing embedded stuff on my computer bench. It arrived with a defective touch panel, which started my adventure in reverse engineering. At the time it was just released so not a lot known about it.

The suckers in the world are the ones that buy it now, with so many youtube reviews showing what crap devices they are.