Products > Test Equipment
Please suggest a good cheap USB 16CH logic analyser
rsjsouza:
You guys made me curious. I opened my Kingst LA2016 and it is identical to the one at Sigrok.
picitup:
Well the USB 1.1 hub arrived and to check it really does provide a bottleneck, I tested my USB stick with h2testw directly into the USB 3 port of my laptop and got 25MB/s write speed. Then through the 1.1 hub I got 1.1MB/s so yes, it does provide a bottleneck lol.
The 100Mhz xtal osc has arrived, and I'm just waiting for the two ripple counters so I'll report back when those appear.
Cheers
Steve
TK:
If the logic analyzer has internal capture RAM, then what USB transfer rate you have should be irrelevant. If it offers real time streaming mode, then matters.
picitup:
Yes, that's the test. I want to see that the on board storage actually works. Probably should get out more...
Steve
picitup:
Well I'm still waiting for parts for the frequency divider. The post is really slow here, I guess the donkey's ill again.
I woke early today and got to wondering what the accuracy of the LA5016 is and started looking at the PCB again. There's only 1 crystal on board and that's the 24MHz for the Cypress USB chip. I'm guessing the FPGA gets its clocks from the Cypress chip. According page 26 of the the data sheet, the xtal pins of the 100 pin device are pins 10 and 11 (XTALIN and XTALOUT) but it is legal to drive XTALIN from an external 3.3v 24MHz clock. The data sheet is here:
https://www.cypress.com/file/138911/download
The xtal on board has no markings, apart from 24.00 on the top so I'm guessing it's a cheapy one. If required, it should be possible to fit a 24Mhz tcxo to improve the accuracy. When I get a minute, I'll test the LA5016 as-is on my 10Mhz gpsdo.
Cheers
Steve
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