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Comparison of oscilloscope probes PVP2350 vs PVP3150 vs LF312 vs HV150

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CosteC:
Hello guys

I made comparison between
Rigol PVP2350 (350 MHz, 1:10, 1 ns, 10 pF)
Rigol PVP3150 (150 MHz, 1:10, 2.3 ns, 10 pF)
TESTEC LF312 (150 MHz, 1:10, 2,3 ns, 15.5 nF)
TESTEC HV150 (1.5 kV, 1:100, 300 MHz, 1.2 ns, 4 pF)
All connected to the same avalanche pulse generator, 50 Ohm output, with probe-to-BNC connector. Compensated. Scope used Rigol MSO5354.
Results are confusing to me: seems fastest PVP2350 has ugliest, slowest response! HV150 has slightly higher amplitude, but this can easily be attributed to lower capacitance.

Can anybody connect PVP2350 to some fast signal source, and post result?

nctnico:
You need to test probes from a 25 Ohm source. So with a terminator at the probe tip.

CosteC:

--- Quote from: nctnico on May 22, 2023, 08:06:24 pm ---You need to test probes from a 25 Ohm source. So with a terminator at the probe tip.

--- End quote ---
Why 25 Ohm? Probes are Hi-Z by definition and probing 50 Ohm source make lot of sense. Probe GND is via BNC adaptor, it can't be done much better. All probes are tested the same way. Issue is why higher bandwidth PVP2350 looks worse and slower than PVP3150?

tautech:

--- Quote from: CosteC on May 23, 2023, 05:38:49 am ---
--- Quote from: nctnico on May 22, 2023, 08:06:24 pm ---You need to test probes from a 25 Ohm source. So with a terminator at the probe tip.

--- End quote ---
Why 25 Ohm?

--- End quote ---
Industry standard.  ;)

Then the only way to compare probes is to save one as a Reference waveform to compare the other against as the moment you introduce another the results change.
Don't believe me, try it and see.  ;)

CosteC:

--- Quote from: tautech on May 23, 2023, 05:49:16 am ---Then the only way to compare probes is to save one as a Reference waveform to compare the other against as the moment you introduce another the results change.
Don't believe me, try it and see.  ;)

--- End quote ---
No need. Differences are obvious. I could connect all 4 to generator, yet capacivtie loading would be much higher and rising edges less steep. I wonder if it is my scope or my probes and how even frequency response of PVP2350 is.

Any home method of checking it? No 350 MHz generator around, however I will make comparison to 3 GHz scope later, but only with 500 MHz probe.

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