Products > Test Equipment
Please suggest a good cheap USB 16CH logic analyser
0xdeadbeef:
ScanaStudio 2.x is a very old version which never came out of beta as far as I know. In my currently installed version 3.x of ScanaStudio (newest version is 4.x), my original ScanaPlus is correctly detected as such. If this is not the case in the old beta you're using, this is most probably a bug.
My understanding is that the only difference between ScanaPlus "V1" and V2 is firmware (FPGA code) which can't be updated for the end-user on the ScanaPlus (big design mistake IMHO).
The original ScanaPlus always samples all 9 channels internally. So if you only need e.g. two channels, the USB bandwidth for the other 7 channels is wasted. In the V2 model, they introduced the channel sampling selection that you just showed. The reason was that people complained about data inconsistencies for signals with higher frequencies (e.g. 10MHz clock signal). Since the ScanaPlus doesn't have any data consistency mechanism implemented (obviously to save bandwidth) at some point, there is a point where more data would be needed than available and the captured/displayed data becomes invalid. With the V2, you could increase the bandwidth by dropping channels. IMHO this concept was more of a panic reaction than a proper design choice. The SP209 has internal RAM now and is said to have a was of checking the consistency of USB data. But that took quite a few years and is still doesn't have USB3 AFAIK.
ebclr:
This is inside LA5016 Jiankun one
rsjsouza:
Thanks for sending this. Interesting how it says JK-LA-X016 but it is only applicable to the LA5016 and LA5032 (the LA2016 and LA1016 are clearly different as they use a smaller connector). Also interesting to see the sea of NC pins on the LA5016 - GNDs could make life easier for higher speeds.
For comparison, a LA2016 photo at Sigrok.
picitup:
My LA5016 is labelled Kingst and it has a slightly different layout with BGA ram and less components. I've added a pic for all to see.
I've ordered a USB 1.1 hub to prove the memory really works and a 100MHz xtal osc and a couple of TC74VHC393FN dual 4 stage ripple counters, so will wire it up to produce 16 different signals (100Mhz, 50MHz, 25.....) and try all 16 channels with the USB 1.1 port at once.
Good point about the unused connections should be grounds. I removed the top lid from my device and the PCB resides in a slot. It really is stuck in tight and I can't get it out lol.
I'll report back when some progress is made.
Cheers
Steve
picitup:
Well a bit of pushing and shoving and I got the PCB out by pulling the case apart slightly. I think some bright spark may have put a drop of superglue on the PCB edge as now it's easier to get the board in and out.
When I put the board back, I couldn't get the case to line up. That's because one edge of the case is male and the other female so you need to put the board in the right way.
I can confirm that all the NC pins really are NC so there's no option of 'improving' the device aka Rigol. When I get a mo I'm going to short all the NC connections to ground so that will help.
The back of the board isn't riveting, but I've attached a pic anyway.
Cheers
Steve
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