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recent experience shopping for hobby scope in today's market. tek, rigol, ...

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tautech:

--- Quote from: bdunham7 on February 28, 2023, 12:41:04 am ---The (Siglent) scopes apparently do have more memory than the bare minimum suggested by their specs, but I doubt it is enough to cover the length of time and sampling rates shown in the example I posted. 

--- End quote ---
We first saw this from History captures however there's no hard and fast rule as to how much larger it is that the datasheet memory depth spec.
SDS1004X-E and SDS5000X offer nice surprises in this regard:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2786800/#msg2786800

nctnico:

--- Quote from: bdunham7 on February 28, 2023, 12:41:04 am ---
--- Quote from: David Hess on February 28, 2023, 12:09:39 am ---The Siglent manual is very specific.  Is it wrong?  On page 37:

When changing the horizontal delay, the delay time displayed in the information
bar at the top of the screen changes in real time, indicating the distance between
the time reference point and the trigger point. The amount of delay range available
depends on the time/div selected and memory depth.

--- End quote ---

That statement appears to be technically correct in that the available settings 'depend' on the other parameters, but the inference that the scope can only work by continuously recording samples from the trigger point to the end of the selected delay clearly appears to be wrong unless there is a lot of extra memory in there.  The scopes apparently do have more memory than the bare minumum suggested by their specs, but I doubt it is enough to cover the length of time and sampling rates shown in the example I posted.  I was unaware that my Siglent scopes had that ability until today--I've never had reason to dial in that much delay and like you, I would have assumed I could only push the trigger point off the left of the screen by one record length.  It never occurred to me that I could push it out by a full hour!

Edit:  On the SDS2104X+, the maximum trigger delay is 10Ms, or about 115 days.  The acquisition would be 1ks/div, or about 3 hours per screen at 20kSa/s.  It does say "Slow Acquisition" on the screen.... :)

--- End quote ---
But it is still weird that there is a limit of 10000 divisions. This seems to be copied straight from Lecroy as well (like no zooming out) for no good reason.

bdunham7:

--- Quote from: nctnico on February 28, 2023, 01:31:58 am ---But it is still weird that there is a limit of 10000 divisions. This seems to be copied straight from Lecroy as well (like no zooming out) for no good reason.

--- End quote ---

Yes, there seems to be a sort of 'that's the way it happened' rather than 'we designed in a useful feature' situation.  I can't imagine they would take a design that had a maximum trigger delay of 11 days and say "gee, let's make it 10X as long just in case..."  And it's not memory, you can manually reduce the memory depth and not change the timing.  However, the 10k division limit is meaningless when you factor in zoom.  Even on that 115-day acquisition, I can zoom in up to 50µs/div, which seems to be deliberately and sensibly set at one sample per division--no point in zooming in more than that.

argile_tile:
from OP

Laught all you want I returned it ;)  Although I did like my choice.  Something came up.

Turns out the "care free warranty" bought with the scope didn't arrive with it.  4-8 wk wait due to some distributor hang up.

Without the warranty it was too risky for me.  Is it $750/yr or $75/yr?  Does their regular warranty dept cheat like some other brands?  idk.  idk.

(un-repairability and 0 warranty make scope shopping difficult:  i checked Keysight EDU:  their ps have a part number but NOBODY sells them.  ps built around a custom ic 5layer, if it dies then you need a good one to even hope to build one, and so on you all know the story.  compare to LED tv with PS in separate box replaceable at BestBuy - you know if your LED tv needs a PS then your not out a gambled $500, is the answer there)

nctnico:
@argile_tile: you are way to worked up about warranty and repairability. In modern test equipment failures are extremely rare. There are not much parts in it and nothing runs really hot. And if something fails, it is usually power related which is easy to fix. Even without a schematic as power supply stuff is as generic as it gets.

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