Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
RAPo:
This a very helpful forum. Ask questions like you want. The people that will respond are questions also (like the million dollar question:why and wherefore is the scope needed?) This process is maybe a bit confronting but it really helps for you descion.
Aldo22:
--- Quote from: jbenam on September 21, 2023, 03:08:09 pm ---It says 91.30EUR here. Not sure what it is going on with AliExpress’ pricing algorithm.
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Strange. Is that with or without "2€ di sconto ogni 15€ (max 10€)"?
You will see the final price when you add it to the cart.
--- Quote from: jbenam on September 21, 2023, 03:08:09 pm ---If the FNIRSI is a better unit when it comes to build quality, support and features I will gladly spend 40EURs more.
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It's probably not that simple.
Both have advantages and disadvantages.
The DSO2512 has a video output so you can view the signal on a larger screen and also view/save it on your computer via an adapter.
The Fnirsi DPOX has better specs, but on the Zeeweii DSO2512 the software is quite mature and the device actually hardly causes any annoyance.
I don't have a Fnirsi DPOX. There are people here who have both devices.
Maybe they can give you some more advice.
In any case, the DSO2512 is cheaper than the DPOX.
Rooster Cogburn:
--- Quote from: jbenam on September 20, 2023, 09:20:26 pm ---Hello everyone, just signed up after lurking for a few years. I have been wanting to purchase an oscilloscope for years but I can’t justify spending more than a hundred bucks for what’s pretty much an hobby.
I like repairing old computers (and maybe CRTs?) and I don’t think I will ever have to go higher than 100MHz.
If so is this oscilloscope a good suggestion for retro repairs or is there something better suited?
Thanks for your help!
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I mostly modify / repair old electronics, including my CRT collection. That's why I bought this scope. I'm quite happy with it, but I think the software features are a bit sparse. The trigger and measurement / cursor features are rather basic. I would've considered buying a more expensive bench scope, but space is at a premium so something DMM sized is a real win. I'm quite happy with my purchase, doesn't seem like you can do much better at this size and price point.
battlecoder:
--- Quote from: imarcinszn on September 08, 2023, 08:26:46 am ---I performed some measurements and i think that this is AC blocking capacitor:
At the input (just at the output of the relay) of this capacitor signal is the same, no matter if it
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This is really good info. I noticed the calibration discrepancy but I thought I was using the wrong probes (or worst; that I never calibrated them despite remembering that I did), as I used the scope on DC one day (and calibrated it), and AC at least a day later (and it looked all messed up). First, I'm glad to know it's a known problem and it's between AC and DC (which I have verified), and second, because if it's just a matter of changing that capacitor I might be able to repair it myself. I'm assuming there should be one for CH1 and one for CH2?
Also, What would be a good capacitor value to put there, though?
Serhii74:
Dear friend!
The problem with underestimation of signal level measurements and distortion of the square wave shape at frequencies up to 1 kHz in AC mode has been resolved.
It lies in the incorrect installation of the coupling capacitor. It is set to 740 pF, but should be 0.1 mF.
After replacing the capacitors, any signal shapes and amplitudes are not distorted.
You will need to replace the circled capacitors with ceramic capacitors of the same size 0.1 microfarad 100 volts.
Testing was carried out in the frequency range from several hertz to 20 megahertz.
Distortions in the level and shape of the signals have disappeared.
The result is in photos 4 and 5.
Photo 4 shows a square wave at a frequency of 50 hertz in AC mode with a phase shift of 180 degrees.
Photo 5 measures the shape and amplitude of the voltage in the socket in RMS mode and compares it with a multimeter.
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