Products > Test Equipment
SainSmart DDS120 & DDS140 USB Oscilloscope
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psynapse:
I agree, that's pretty stupid of me. An old man with a poor memory. Sorry.

The executable version is windows ..... so I will have to recompile from source under linux and QT ... expect this to take time... I am not clear whether the mmark version of the source is the most current , but will give it a go.
bobi_dunkel:

--- Quote from: psynapse on December 05, 2014, 01:41:59 am ---I agree, that's pretty stupid of me. An old man with a poor memory. Sorry.
The executable version is windows ..... so I will have to recompile from source under linux and QT ... expect this to take time... I am not clear whether the mmark version of the source is the most current , but will give it a go.

--- End quote ---

No problem i have problem with memory also  ;) . It seems that Mr "ganzuul" is the compiler of "Lediosope" for windows.
I was hoping he will find the answer for longer time base left shift.
But again maybe it is the problem of OpenHantek and I need to contact the author.
mmark:

--- Quote from: bobi_dunkel on December 04, 2014, 12:04:56 pm ---Hi everybody.
I have stumbled on this thread in May, only a few posts. 5 days ago went through my favorites
and happy to see 14 pages of posts  :). Reading it since… 
What to say, great job, really great job.
I have DD120 and if you need some help please let me know.
I can be some beta tester because my knowledge of eeprom and programing is really limited. Personally bought this scope for automotive sensor testing.
And it is doing a great job. The only thing lacking in original software is longer time base. (60sec or even longer 5 min)
So I have downloaded Ledioskope (a.k.a OpenHantek for DD120). It is working really well.
The problem is when I select longer time base. It shifts the display to the left. If i select 5min the wave becomes one red dot in left corner.
What am I doing wrong?
Please see the attached pics.

--- End quote ---

Bobi,

did you try to switch to 'Large Buffer Size'? (Menu Oscilloscope => Buffer Size => Large)? This will give you 32768 samples (the default is Small=2048), therefore the displayed trace will be longer.

I did not implement a rolling update or a continuous sampling yet, so even with the larger buffer you eventually will run out of samples. The reason for that is that the DDS120 has a minimum hardware sample rate of 240kHz. With the large buffer (32768 samples), the maximum total time is 32768 / 240 kHz = 136.5ms. So if you select a time basis larger 10 ms/div (= 100ms total), there wont be enough data to display...

Mark
bobi_dunkel:
Mark,
You are right. Wen I select bigger buffer I can go to 500ms , but at 1 s  , have left shift of wave data.
So it is buffer issue. Waiting for your continuous sampling  :-+
doctormord:
@psynapse,

RichardK released the sources of his open6022BE project:

https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/msg566881/#msg566881

https://jumpshare.com/v/bviO41a4x8CiAaSSbama

You may have a look at it.

A binary to play with is available here, it features a demo mode.

https://jumpshare.com/v/q1Spmyw0dk7BmnRd77tk

Regards,

Christian
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