Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
csuhi17:
Don't expect much from them, because these are not +2000 USD scopes.
I only need this primarily to measure with it first, if something is suspicious (so as not to burn the larger scope), or if I know that it can also serve me.
There is a cure for the inaccuracy seen in the videos.
two capacitors in the first series are of bad value, if you manage to buy them, you will have to replace them so that they don't measure stupidly at low frequencies.
Both are 500MS, only the fnirsi has a slightly nicer picture, it is more visible.
Apart from the software errors that are being repaired, and the fact that I think a basic function is missing, it can be a good choice.
I haven't used it live yet, I've only tested it at the table.
.
Aldo22:
--- Quote from: jld071 on October 08, 2023, 09:56:34 am ---The dso2512g seems to be more viable for "in the field" work for the moment, the counterpart of this is the reduction of price between the two systems, as the gap seems to shrink (sometime 20€ difference on aliexpress :( )
--- End quote ---
You can sometimes find promotions at the Zeeweii store as well, so it's hard to tell with the price difference.
Anyway, today the devices cost at the respective "Official Stores" (which I would recommend, because they do answer questions.):
ZEEWEII DSO2512G : $86.40
FNIRSI DPOX180H : $127.86
That's a price difference of 41.46. So the difference is almost half of the zeeweii price.
Maybe you don't mind the price, but it should be clear that for that difference, you can expect a slightly "better" device.
Whether the Fnirsi is really significantly better "in the field", I can not tell.
If you're just sending it ahead to save the expensive scope from burning like csuhi17, I'd go with the Zeewei simply because it's cheaper.
battlecoder:
--- Quote from: jld071 on October 08, 2023, 09:56:34 am ---Hello,
I'm also looking for a portable oscilloscope and I'm hesitating between the fnirsi dpox180h and the zeewei dso2512g...
For what I can see, as a newbie, after reading tons of videos and forum posts, the Fnirsi dpox180h seems interesting on the paper but I haven't yet seen great examples of its phophor functionality for diagnosis or analysis.
A lot of the online content is mainly about all the bugs and inaccuracy of that scope : not very reassuring, even if the firmware is evoluting there might be some hardware limitations due to the system by itself.
The dso2512g seems to be more viable for "in the field" work for the moment, the counterpart of this is the reduction of price between the two systems, as the gap seems to shrink (sometime 20€ difference on aliexpress :( )
So what should I do ? go for the new dpo crossing my fingers to hope for a new firmware which will correct the bugs and give plenty access to the new functionalities or be on the safe side by choosing the already validated dso ?
Thanks in advance :-\
--- End quote ---
The DPO180H "looks" a lot better than the 2512G, with a sleeker design, sexier screen, phosphor trace goodness, 20Mhz bandwidth limiting, temperature-colored trace, etc. But none of that has actually been of use to me. I've been unable to use it to measure *anything* correctly out of the box, unlike the Zeeweii, which has actually been useful from day 1. With discounts you can get it very close to the price of the Zeeweii, BUT on arrival you should be ready to AT LEAST, do the following:
1.- Change the 2 AC blocking SMD capacitors in the front end.
2- Buy better probes. The ones included are abysmal
Now, the DPO180H has the advantage of a better frequency range. I've said this already but I wouldn't use the 2512G for anything above 50Mhz unless you are only "checking for a pulse" on your circuit. That unit also requires you to overclock it in order to barely reach the claimed bandwidth (at which point you can sort-of see a 120Mhz waveform, but forget about making any measurement on it). The DPO180H on the other hand doesn't require any fiddling to display a waveform up to, more or less, the claimed bandwidth. Both are supposedly 500MSa/s, so I suspect that the frontend implementation and the "processor" in both units is what makes the difference in their performance, but that's just a guess.
Other Advantages of the DPO: Being able to capture a waveform and then use it directly in the function generator is a huge plus.
Other disadvantages: Shorter battery life, Extremely menu-heavy UI; Everything is done through menus, unlike the Zeeweii that has numerous (somewhat intuitive, once you learn them) key shortcuts.
So, if you need high frequency response, or any of the fancy features of the DPO, and you are willing to either deal with the bugs or wait for fixes, and you are also OK with spending a bit more time and money fixing the caps and changing the probes, then the DPO180H is what I'd recommend.
If you don't need to measure anything >50Mhz, and you want something that is practical to use, with longer battery life, and you are OK with a rather lackluster UI and crude trace, then the Zeeweii would be my recommendation.
battlecoder:
--- Quote from: csuhi17 on October 08, 2023, 08:15:54 am ---I made a measurement error. |O
Sig gen FY6800 60MHz
In the case when the polarity is measured correctly (as when using the BNC to BNC cable), the measured voltage between the two scopes is less than 5%. 1V measured from 0-60MHz.
If, on the other hand, I want to swap the two measurement points, that is, I connect the GND of the AWG to the input of the oscilloscope.
I connect the output of AWG to the GND of the oscilloscope.
Then the voltage level changes a lot and fluctuates.
It could be something on my side, I haven't figured out what's causing it yet.
I measured it directly on the BNC output of the AWG (without converter and extension) with the 10x test lead provided for the STO2202C, and it produced the same result. :-//
--- End quote ---
I haven't done the experiment of switching GND and signal, but I did try with a straight coax connection (no probe) last night, and there was still a bit of a gain error, but it was a lot more acceptable than the measurements with the provided probes.
Now, just to highlight how garbage the included probes are (and incidentally, to also show the discrepancy in vertical gain at different sensitivity levels) ; this is supposedly a 1Vpp sine wave:
At 200mV per division, the oscilloscope shows 1.25Vpp, which is a 25% error. Switching to better probes, the amplitude reported at this sensitivity level was almost exactly 1V, so, if you are using a good probe, at this vertical scale, things would have been great.
If you change the sensitivity to 500mV, there's a 34% error (with the included probes). Using a better probe was showing something like 1.15V, which is somewhat more acceptable, and kinda reasonable for a waveform that is using just 2 divisions, vertically.
So my conclusions from this are that the included probes (at least the ones I got) are not making the scope any favors so you must change them if they are as bad as this, but also, it would be great if there was a way of adjusting the gain per sensitivity level (like on the Zeeweii) because I don't think they are being that well calibrated from factory.
Nik:
More fun with FNIRSIS internal signal generator. I ended up with a code that just creates a signal inside the generator if it is connected as drive D without any other manual steps.
Code is here:
https://github.com/nik1nik1/SaveSignaltoFNIRSIGenerator
Attached are screenshots of a PWM sine that it makes which looks okay at low freq. At 2MHz scope makes something that resemble a sine out of it thanks to its input capacitors :-DD.
I played with Tetronix generator and Audacity Audio editor and found that it is difficult to use them with FNIRSI and they have limitations as it requires a lot of manual steps and just can not do some things rather than simple ones.
Have fun
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