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R&S rtb2004 Newby segmented memory question

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alonsojar:
Hello,
I have the opportunity to purchase a refurbished RTB2004. It has the full 300MHz bandwidth and only MSO RTB-B1 option (but not any protocol decoding option that are sold separately at R&S prices  :-\).

The scope doesn't have any other option active, but my real worry is the lack of segmented memory. The option (RTB-K15) costs more than 1K euro and is not affordable for me.
Since I'm not used to modern oscilloscopes, I don't really know how usable will be the scope without such option. I'm checking the manual, but I cannot figure out what is the real impact of this. Of course the segmented memory will store data captured during more samples so you could go forth and back to it searching for events, but does it mean that without that memory I could only analyse the sample that fits on a single scope screen with the resolution used in the capture?

I would really appreciate if someone could help me understand this subject (ideally in this particular scope) and evaluate if I should go for the scope or skip it...

Thanks!!
J. Alonso

Fungus:

--- Quote from: alonsojar on November 18, 2022, 05:04:52 pm ---does it mean that without that memory I could only analyse the sample that fits on a single scope screen with the resolution used in the capture?

--- End quote ---

No, that's Siglents that do that, R&S will let you zoom out and see what came before/after.

Segmented memory lets you split the memory up into chunks and each chunk will fill up on a separate trigger event.

PS: You don't say how much you're going to pay for it...

nctnico:

--- Quote from: alonsojar on November 18, 2022, 05:04:52 pm ---I would really appreciate if someone could help me understand this subject (ideally in this particular scope) and evaluate if I should go for the scope or skip it...

--- End quote ---
As Fungus already wrote: if you set the memory to a fixed length, then the RTB2004 will use the entire memory even if it means some is outside the screen. So you can always see what is beyond the screen to look at previous and next events. History / segmented mode is useful to look at events that are few and far apart.

Whether this oscilloscope is a good deal for you depends on your use case. Are you looking at analog signals only or would decoding be useful to you?

alonsojar:
Thank you Fungus and ntcnico, your explanation really helps me.

I'm not particularly interested in digital decoding. When I (rarely) try decoding  I use an usb logical analyser box connected to my computer and I never missed to mix digital and analog signals. This scope has the digital channels activated, but even a simple protocol like I2C will not be easy to follow (at least for me) in raw without a decoding sw...so probably this part of the scope is quite useless without purchasing some protocols... 

The price it's offered is 1.6K euros (taxes included). It comes with all probes (included digital channels). I would have preferred to have some other options installed like the ARB generator, but for the activation list price (720 euros) there are good options in the market and with 2 channels and higher specs...
Anyway , should it be a good deal in your opinion?

tautech:

--- Quote from: Fungus on November 18, 2022, 05:58:27 pm ---No, that's Siglents that do that, ..............

--- End quote ---
Some not all, other brands too.

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