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Another radio amateur about to buy a DSO ...
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2N3055:

--- Quote from: G0HZU on November 11, 2023, 04:26:04 pm ---
--- Quote from: ebastler on November 11, 2023, 03:56:41 pm ---
--- Quote from: G0HZU on November 11, 2023, 02:19:45 pm ---Take a look inside a Rigol 5000 series scope. There's a front end relay to select to the 50R path (and the 50R path looks to have a relay controlled attenuator) but the main 1Meg path is all done using a series of tapped resistors

--- End quote ---

I don't think the MSO5000 has an internal 50 Ohm input path at all. Are we thinking of the same scope here?

--- End quote ---

Whoops, sorry for any confusion caused. It turns out that I was describing the Rigol 7000 scope. I was watching Dave's Rigol 5000 teardown and he had overlaid a screenshot of the 7000 front end. I got the two mixed up and it's only the 7000 that appears to have the 50 ohm path.

Both of them appear to have the tapped resistive network on the 1Meg path though. They look very similar in this respect so I'd expect both of them to be quite noisy because of this.

--- End quote ---

You are correct. They are noisy..
tautech:

--- Quote from: Mike99 on November 11, 2023, 04:24:08 pm ---
--- Quote from: tautech on November 11, 2023, 04:06:46 pm ---
--- Quote from: Mike99 on November 11, 2023, 02:50:47 pm ---At a push I could go for the Siglent SDS2202X-E.

A 50 ohm input would be useful but I was planning to use a feedthrough terminator.

--- End quote ---
You do get more features with 2kX-E models.
1M/50 Ohm input path.
Webserver
Bode plot
WiFi

And it's a 350 MHz design......

--- End quote ---

Now that's interesting. If I bought the SDS2202X-E (200MHz) could I open it out to 350MHz?

--- End quote ---
Yup. Not difficult at all.

IIRC -3dB BW =~400 MHz

Member xrunner posts about his here:
https://www.eevblog.com/forum/testgear/oldish-vs-newish-test-equipment/msg4685039/#msg4685039
tggzzz:

--- Quote from: tautech on November 11, 2023, 04:06:46 pm ---
--- Quote from: Mike99 on November 11, 2023, 02:50:47 pm ---At a push I could go for the Siglent SDS2202X-E.

A 50 ohm input would be useful but I was planning to use a feedthrough terminator.

--- End quote ---
You do get more features with 2kX-E models.
1M/50 Ohm input path.

--- End quote ---

Are they 50ohm inputs or 1Mohm//50ohm//15pF inputs?

What's the VSWR, which is relevant at RF frequencies?
tautech:

--- Quote from: tggzzz on November 11, 2023, 05:42:42 pm ---
--- Quote from: tautech on November 11, 2023, 04:06:46 pm ---
--- Quote from: Mike99 on November 11, 2023, 02:50:47 pm ---At a push I could go for the Siglent SDS2202X-E.

A 50 ohm input would be useful but I was planning to use a feedthrough terminator.

--- End quote ---
You do get more features with 2kX-E models.
1M/50 Ohm input path.

--- End quote ---

Are they 50ohm inputs or 1Mohm//50ohm//15pF inputs?

What's the VSWR, which is relevant at RF frequencies?

--- End quote ---
https://int.siglent.com/u_file/document/SDS2000X-E_DataSheet_DS0102E-E02A.pdf
tggzzz:

--- Quote from: tautech on November 11, 2023, 05:44:58 pm ---
--- Quote from: tggzzz on November 11, 2023, 05:42:42 pm ---
--- Quote from: tautech on November 11, 2023, 04:06:46 pm ---
--- Quote from: Mike99 on November 11, 2023, 02:50:47 pm ---At a push I could go for the Siglent SDS2202X-E.

A 50 ohm input would be useful but I was planning to use a feedthrough terminator.

--- End quote ---
You do get more features with 2kX-E models.
1M/50 Ohm input path.

--- End quote ---

Are they 50ohm inputs or 1Mohm//50ohm//15pF inputs?

What's the VSWR, which is relevant at RF frequencies?

--- End quote ---
https://int.siglent.com/u_file/document/SDS2000X-E_DataSheet_DS0102E-E02A.pdf

--- End quote ---

VSWR isn't specified, which often happens where the manufacturer just puts a 50ohm resistor in parallel with the 15pF 18pF.

Any chance you could put a VNA on one of yours, in order to settle the issue?
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