Products > Test Equipment
SainSmart DDS120 & DDS140 USB Oscilloscope
ganzuul:
ED:
We have FOSS code!!
/ED
This scope is advertised as 50Ms/s while the ADC runs at 40MHz. The supplied software switches down to a sampling rate of 2.4 "MHz" when over a certain time division, and then over the time division it switches up to 50MHz. The resulting graph is not as pretty as I'd like... The lowered sampling rate appears to be a way to avoid writing sub-pixel graphing accuracy, but it could also be a self-imposed CPU load ceiling.
The two probes are of the model TP6100, which when sold separately reportedly cost $9 on eBay. They are probably not true 100MHz probes, but one review of them that I saw referred to them as "good stuff".
There's a rather exposed I2C interface, which I have heard lends itself to hackability. There is also an API to the driver with a sample project for the Microsoft platform SDK.
I placed my order on May 8th, so it took 12 days to deliver it from China to Finland. I paid $67.99 in total. I ordered it from here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300992154516
So far I'm happy with the hardware I actually got for the money but will have to look into making the scope work with some existing open source package.
R4 - AD9288BSTZ-40:
http://www.analog.com/static/imported-files/data_sheets/AD9288.pdf
C10 - CY7C68013A:
http://www.cypress.com/?docID=45142
R13 - 24LC64:
http://www.mouser.com/ds/2/268/21189h-21840.pdf
I'll bump this when I know more about this thing!
ED:
Added some high-res pics to my private web server:
http://nya.dy.fi/static/images/PICT3351.JPG
http://nya.dy.fi/static/images/PICT3348.JPG
http://nya.dy.fi/static/images/PICT3347.JPG
These photographs are just under 6MB each.
ED2:
Updates..
ganzuul:
Well my ISP shut me down for a few when I tried to zone transfer some Chinese DNS records. :P I was thinking www.buudai.com might have a new IP which hasn't propagated yet, so in want of that I cyber-stalked the developer instead! :-/O
https://web.archive.org/web/20140520231246/http://bbs.21ic.com/icview-350047-1-1.html
Looks like a university student who couldn't afford a scope of his own, so instead he built one for himself.
ED:
Forgot this. The software package that gets distributed with the Rocktech version of the scope has one additional functional button in the UI, but the version number is the same.
http://m5.img.dxcdn.com/CDDriver/CD/sku.271544.rar
(From http://www.dx.com/p/bm102-bm102-50mhz-2-ch-usb-analog-oscilloscope-silver-grey-271544#.U3vp5a4Rots )
mikewardlow:
I purchased the DDS120 [BM102] in August. It sort of works , the display software needs much improving, :palm:
I was trying to detect a pulse train [ie] 100us pulse, 100us delay, 100us pulse, 8 second delay, this sequence repeats :-+
Trying to use single trigger :--, it would sometimes take 2 minutes to capture a trace :=\, it seems like the larger the delay 8, the longer it takes to catch the trigger :-// ... Normal trigger was not much better. All the trace captures displays started at center screen, I have been unable to change that, who needs a 50% pretrigger area :--? When I would capture a signal, starting at center screen, then change the time base, it would rescale proper on some timebase, bad on some, missing on some. :-BROKE
It is a useable product if you don't need to observe 1 time events, again the display software needs much improving
mikewardlow:
Have been in contact with Sainsmart, they are working on a SW upgrade that will hopefully be released [ next 7 days] :-DD
I'm not going to hold my breath :-//
doctormord:
Thanks for your efforts. Let us know on any news. :-)
Cheers
doc
Edit:
Q2/Q3/Q?/Q? = AD8065ART-R2
Datasheet: http://www.analog.com/static/imported-files/data_sheets/AD8065_8066.pdf
Navigation
[0] Message Index
[#] Next page
Go to full version