Products > Test Equipment
New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)
RAPo:
I'll know. :-+ But I want to be honest, my first complains was about connecting the probes and the stiff buttons. The new case is much better regarding these points.
battlecoder:
I ended up buying a set of P2200 probes that "fixed" the accuracy problems I was having. It was literally driving me mad that at higher frequencies the amplitude would lose accuracy so wildly. As I've been using it more frequently, I've come to appreciate the instrument considerably more. Given a decent set of probes it's as useful as the Zeweeii but with a higher bandwidth and extra features (ok, and some weird bugs and quirks, but it's not like the Zeweeii is hassle-free). At least I'm no longer losing hair because the measurements don't match my other instruments.
Now, It would be great to make a "wave management" software to backup, restore, view and export captured waveforms (to CSV for example). Maybe to also convert regular wave captures into signals for the frequency generator and vice-versa
As it is right now, even the simple act of creating backups of your waves and restoring them (with a different filename/number) cannot be done without modifying the files, because apparently some bytes inside the files need to match the filename. A program to take care of all of this would be fantastic.
Once I finish with other projects I could tackle that, assuming that @Nik is not already working on it :P
Hugo145:
Hello,
I have bought this scope to debug tube amplifiers so I'm mainly interested in audio frequencies 20Hz-20kHz and high voltages 300V+.
1. Does anyone know whether DPOX180H has AC coupling capacitor before or after the 1Meg resistor? As I understand, if coupling capacitor is before the 1Meg resistor then regardless of probe attenuation 1:10 or 1:100 in AC mode this capacitor will see the full 300V+ voltage which it is not rated for.
2. If I replace these capacitor (as suggested in this thread earlier) with 100nF 400V rated ones, will this work? Or is there another circuitry inside the scope that sees the full voltage in AC mode?
3. Is it possible to replace the SMD capacitor with non-SMD leaded one? Or will this introduce inductance to the circuit and make readings inaccurate?
Thanks you,
Igor.
Hugo145:
--- Quote ---Does anyone know whether DPOX180H has AC coupling capacitor before or after the 1Meg resistor? As I understand, if coupling capacitor is before the 1Meg resistor then regardless of probe attenuation 1:10 or 1:100 in AC mode this capacitor will see the full 300V+ voltage which it is not rated for.
--- End quote ---
For anyone curious, I opened the scope and measured myself.
The 1Meg resistor to ground (actually multiple resistors in series) is the first thing signal sees when entering the scope. Therefore with 1:10 probe attenuation it should be safe to use in AC coupling mode.
Rooster Cogburn:
Dave reviewed the unit with the revised case:
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