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Zooming *IN* [actually: signal reconstruction]

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rf-loop:

--- Quote from: Bud on October 22, 2022, 03:07:04 pm ---
--- Quote from: 2N3055 on October 22, 2022, 01:41:28 pm ---That is why we say that long sampling memory is important, to keep native sample rate as long as possible. And that is why Keysight Megazoom is good "analog emulation" scope but loses even to DS1000Z when you need to sample longer period and zoom in to detail...

--- End quote ---
Not true for event-based sampling. Keysight with its segmented memory can sample and store only when triggered. With that, you can have information captured for much longer if events are spaced apart in time than a scope with larger conventional memory, which will get filled in a few milliseconds.

--- End quote ---

Bit different thing this segmented memory acq.
 
And it is also limited to available amount of memory and also limited to max 1000 segments least in some Megazoom IV infinii vision X series 1000X to 6000X.

In many scopes there is more memory - also for segmented acquisition of course. Example even in Siglent SDS1004X-E up to 109Mpts  and lot of more than max 1000 segment.

Many oscilloscopes today have some kind of segmented memory acquisition - even in Rigol. But, also more memory for it. So what is point...  most of modern normal scopes have it.

2N3055:

--- Quote from: Bud on October 22, 2022, 03:07:04 pm ---
--- Quote from: 2N3055 on October 22, 2022, 01:41:28 pm ---That is why we say that long sampling memory is important, to keep native sample rate as long as possible. And that is why Keysight Megazoom is good "analog emulation" scope but loses even to DS1000Z when you need to sample longer period and zoom in to detail...

--- End quote ---
Not true for event-based sampling. Keysight with its segmented memory can sample and store only when triggered. With that, you can have information captured for much longer if events are spaced apart in time than a scope with larger conventional memory, which will get filled in a few milliseconds.

--- End quote ---
That is absolutelly not what we are talking about in this topic. True, but not a topic.

balnazzar:

--- Quote from: Fungus on October 22, 2022, 03:44:32 pm ---
I assume it's because they'd have to up the processing power to match.


--- End quote ---

As I thought. So, the bottleneck, in the end, is always processing power...

tautech:

--- Quote from: bdunham7 on October 22, 2022, 03:03:43 pm ---
--- Quote from: balnazzar on October 22, 2022, 02:39:22 pm ---At this point i feel obliged to ask: why manufacturers don't release scopes with more mem depth. They seem to be on the verge of generous with other specs (see indeed rigol with sub-1k$ 350 MHz 8 GSa/s), but memory depth is almost always the weak point of accessible scopes..

--- End quote ---

How much do you want?  Current model entry level DSOs have an astounding amount of memory compared to older current models, even those from A brands.

--- End quote ---
FTFY

balnazzar:

--- Quote from: tautech on October 22, 2022, 06:35:09 pm ---
--- Quote from: bdunham7 on October 22, 2022, 03:03:43 pm ---
--- Quote from: balnazzar on October 22, 2022, 02:39:22 pm ---At this point i feel obliged to ask: why manufacturers don't release scopes with more mem depth. They seem to be on the verge of generous with other specs (see indeed rigol with sub-1k$ 350 MHz 8 GSa/s), but memory depth is almost always the weak point of accessible scopes..

--- End quote ---

How much do you want?  Current model entry level DSOs have an astounding amount of memory compared to older current models, even those from A brands.

--- End quote ---
FTFY

--- End quote ---

That's true. If only lower-status brands would care to do a lot of other things better, they'd become the new A-brands.

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