Products > Test Equipment

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

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battlecoder:

--- Quote from: Aldo22 on October 07, 2023, 10:14:06 pm ---I know what you mean and it can be put that way.
It's a bit like asking whether the bottle is half empty or half full.
I also find that it works quite well up to 50MHz and a less well above that, but that's enough for me at this price.
Nevertheless, I can check with this cheap device on which frequency a FM test transmitter works (88.0 MHz - 108.0... MHz) and you can't do that with every toyscope.
It also does not need 3 volts at the input for that, like my AWG with "frequency meter", but a few millivolts are enough.
I find that for its price it is quite a useful device and it does not annoy me.

The Fnirsi costs at least $40 more and that is quite a difference at this price level. Almost not comparable. ;)

--- End quote ---
I definitely think the Zeeweii is a wonderful device for its price. The FNIRSI looks a lot more polished and had a tons of extras, but I still reach for the zeeweii because it's a lot more consistent, and doesn't have weird bugs and bizarre implementation of standard features like cursors.


Btw, back to the FNIRSI, Is anyone here getting extremely inaccurate Vpp measurements? Especially on x10? Like, even on low frequency waveforms, the moment I set it to 10x the Vpp measurements are not matching. I originally thought it was a difference in probe loading, but even probing a properly terminated 50 ohm source gives inconsistent measurements. The error is at best 10%, at worse like 30%. Switching to better probes gives me better results, but as I keep increasing the frequency the error keeps getting bigger and bigger.  A 1V sine wave (that I've verified with other scopes that remains constant 1V in the 1-60Mhz range), even with a decent set of probes the FNIRSI would measure anywhere between 900mV to 1.25V depending on the frequency, sometimes increasing, sometimes decreasing.

It would be great if this scope had gain calibration, because I suspect that it's not only the included probes that are extremely non-linear, but also the scope (Incidentally, guess what budget portable oscilloscope DOES have a gain calibration procedure and doesn't give me weird unexplainable amplitude measurements  ::) )

csuhi17:
it produces similar results for me.
Thanks for sharing, I didn't even notice that.

battlecoder:

--- Quote from: csuhi17 on October 08, 2023, 06:07:19 am ---it produces similar results for me.
Thanks for sharing, I didn't even notice that.

--- End quote ---
Well I'm glad I'm not alone in this, but it sucks that it happens. I would understand if the device started losing accuracy closer to the bandwidth limit, but discrepancies are all over the place even in low frequency signals.

csuhi17:
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. :-//

jld071:
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  :-\

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