Products > Test Equipment

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

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battlecoder:

--- Quote from: csuhi17 on September 30, 2023, 06:55:15 pm ---The Russians also tried replacing the capacitor, they increased the 710 picofarad capacitor to 2000 picofarad.
But they make 7% mistakes.
I had 330pF in it and replaced it with 100nF and it's perfect.

--- End quote ---
It didn't solve the problem for me. At least not with the probes set to 10x. Low frequency square waveforms are still distorted when the probe (at 10x) is compensated on DC coupling, and then I switch to AC coupling. If I compensate the probe on AC it will look fine, but if I switch to DC again now DC will be distorted.

Now, using a probe at 10x with a low frequency waveform only makes sense if you are measuring "high" voltages ("high" enough to require the by-10 attenuation), but still, *most* oscilloscopes don't behave like this. In almost every oscilloscope I have (except one) the probe compensation requires no additional adjustments when switching from DC to AC coupling.

csuhi17:
you're right, half solved it.
 It is possible that it is not only a component assembly error, but also a design error.
 I know it shouldn't behave that way, but it's at least partially usable. although now I'm thinking that I might sell it and buy a ds4t1012 150 Mhz instead.

battlecoder:

--- Quote from: csuhi17 on September 30, 2023, 08:49:34 pm ---you're right, half solved it.
 It is possible that it is not only a component assembly error, but also a design error.
 I know it shouldn't behave that way, but it's at least partially usable. although now I'm thinking that I might sell it and buy a ds4t1012 150 Mhz instead.

--- End quote ---

At this point I'm considering it a minor problem. Especially because I tried the same with all my scopes and there's another one in my lab that also behaves this way. It's annoying, but as long as I'm aware of this, it shouldn't be much of a problem.

Having said that, the closest competitor to this scope (the Zeeweei dso2512g) doesn't have this problem. Sure, it has a lower bandwidth and the menu system and trace drawing is very primitive in comparison, but at the very least it works consistently, provided that you don't push it with the bandwidth (Despite the 120Mhz claim of that scope I wouldn't use it above 50Mhz).

csuhi17:
1 more error.
Without a signal, vertical division is 200mV 1x and the trigger level is set to 200mV, the trigger is single.
Oh, and the trigger has a falling edge.
At 5-50nS, if you press a STO/RET button, it triggers nothing...
At 100nS, if I can see it well, but again at 200nS.
CH1 AC/DC is not affected.

If you succeed in pressing the RUN state, it is already stably waiting for the signal.
It is possible that the button is pressed twice.
But then why only for falling triggering?


Interesting.
If the baseline is in the upper half or right in the middle with the ORIG button, and the trigger arrow is in the upper part, the error will occur.
If I just put the trigger below the center line, there is no error.
If I move the base line below the center line, the error disappears.

infino:

--- Quote from: Serhii74 on September 22, 2023, 11:08:30 pm ---A representative of the FNIRSI company thanked me and offered me a $20 discount for the purchase of this oscilloscope in a new case.
Here is his answer:
--- End quote ---
Горшочек, не вари/ "Töpfchen, steh,"  )))

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