Products > Test Equipment
Rigol DHO804 Test and Compare Thread
Martin72:
I have just had another go at decoding, this time feeding in the signal(SPI) from the competitor's demoboard. >:D
After a few attempts, I managed to get a super-stable signal.
First with 3 channels, so CS included.
I used the "Pulse" trigger.
Then I looked to see if I could do the same with 2 channels and timeout.
Yes, but a few letters were missing, the solution was that the default timeout is 1µs, 8µs was then enough.
Finally I tried it with the SPI trigger.
This also enabled me to create a rockstable trigger with a timeout of 8µs.
Interesting:
In the SPI trigger menu you can only select MISO, but I had previously deactivated MISO in the decoder menu because it is not available on the demo board (only MOSI).
Conclusion:
The decoder signals on the siglentboard are also "bitchy"(like on the batronix board), but with the right settings the DHO achieves super stable decoding - very good. :-+
ebastler:
Hi @Martin72, I came across a thread in the German mikrocontroller.net forum a while ago which discusses I²C decoding on the MSO5000. It is claimed there that the MSO5000 can only decode reliably when it does a surprisingly high amount of oversampling: Sampling at 50x the I²C bit rate is supposedly not enough for reliable decoding, 100x works.
That observation seems very surprising to me, and I am not sure it is correct. The modest DS1054Z -- while being very limited by the fact that it only decodes from screen memory -- can at least do that nicely as soon as it can resolve the bits in the I²C signal. Could you try with the DHO800 which degree of oversampling it needs, by either limiting the memory size or zooming out to a very slow time base? Thanks!
Martin72:
Can do it tomorrow with the batronix demoboard (I²C does not work on the siglent demoboard).
tautech:
--- Quote from: Martin72 on November 19, 2023, 10:04:41 pm ---Can do it tomorrow with the batronix demoboard (I²C does not work on the my siglent demoboard).
--- End quote ---
FTFY ;)
Martin72:
Hehehe.... ;)
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