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Ridiculously small Rigol DS1000z series font size
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marmad:

--- Quote from: markone on January 29, 2016, 12:41:56 am ---Are we talking about mere DSO's screen trace's point vectors (ie 800 pt / ch with interpolation made on PC) or more complex data set ?
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Display memory = 1400 bytes on the DS2000 = 1200 bytes on the DS1000Z= 50 pixels * screen divs * 2


--- Quote ---If positive the first one, the amount of data is quite small, in the order of some hundreds of KBytes/s for a complete screen @ 30FPS, the resulting bandwidth would be achievable also with the old USB 1.0 interface standard.
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Of course, but the point is that the DSO is a real-time instrument designed to be capturing waveforms, moving the waveforms to an intensity buffer, then decimating the contents of the buffer to it's display memory, as fast and as efficiently as possible, with as little blind time as possible. Most users that want to transfer waveform data from the DSO (and there aren't many who even want to do that) want the original deep sample memory for post-processing - not display memory - and that's not possible while running the DSO anyway. So the speed it provides - while still maintaining it's own fast capture rates - are reasonable (but not great).


--- Quote ---It seems that i have to take money out for a new scope with big fonts on the screen

PS : Rigol Tech, if you are reading this, please implement a screen mode with NORMAL fonts for middle aged people !

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Well, as mentioned, I don't really have a problem with any of the text size - except occasionally measurements (and that's usually when I have all or many of them displayed at the same time). Thus my software to throw it up on a large monitor close by.
marmad:

--- Quote from: rich on January 29, 2016, 01:22:36 am ---Is using USB the only option or can the LAN be used and does it give better wfrms/s?

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LAN can be used, but the last time I checked, it was slower then USB.
marmad:

--- Quote from: markone on January 29, 2016, 01:48:40 am ---I'm almost sure it's not an interface bandwidth problem, the data speed is limited by firmware policy for one (or more) of following reasons :

1) the internal DSO HW resosurces are not designed to
2) the code that manages the USB/LAN interface it's not optimized
3) it's the result of a marketing decision

I would bet on the latter.

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1 and 2.

EDIT: I'm pretty sure it's mostly #2, although it's also possible they didn't design the hardware well to allow for fast, asynchronous transfers from display memory during use. Of course, they could have included a SVGA output as standard, but they're always pinching pennies on these low cost DSOs.
miguelvp:

--- Quote from: marmad on January 29, 2016, 05:37:27 am ---
--- Quote from: rich on January 29, 2016, 01:22:36 am ---Is using USB the only option or can the LAN be used and does it give better wfrms/s?

--- End quote ---

LAN can be used, but the last time I checked, it was slower then USB.

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As I mentioned above, if you try to read more than 1420 bytes per transfer the TCP stack has to do resends and it slows it down quite a bit. With the TCP/IP frame overhead the ideal MTU size of 1514 bytes will speed things up making the LAN faster than USB transfers.
marmad:

--- Quote from: miguelvp on January 29, 2016, 05:45:52 am ---As I mentioned above, if you try to read more than 1420 bytes per transfer the TCP stack has to do resends and it slows it down quite a bit. With the TCP/IP frame overhead the ideal MTU size of 1514 bytes will speed things up making the LAN faster than USB transfers.

--- End quote ---

I read your post, but IIRC (I could be wrong, but I'm not around my scope to check at the moment) I get 3-4 second screen captures using USB. So your rate doesn't sound any faster to me.

EDIT: Actually, just double-checked and it takes ~2.5 seconds to get a screen capture to the PC and save it (using USB).
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