| Products > Test Equipment |
| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
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| H.O:
Hi, --- Quote ---When decode zoomed data in SPI mode, the bus status is shifted respect waveforms. --- End quote --- Isn't this the same issue that was on the DS4k a couple of firmware versions ago. Ie, the decoded data "drifted" in relation to the trace when "zooming" and panning thru the captured data? To me it sounds like that is the problem and, at least on the DS4k, it was fixed one or two firmware revisions ago. If you're not running the latest version or have any specific reasons not to I'd probably try that. |
| sotos:
What version are we talking about? |
| H.O:
Hi, Provided this IS indeed the same issue the problem went away when upgrading to 02.00.00.04 - but that was and is for the DS4k, I can't speak for the DS2k as I don't think they share the same firmware. |
| marmad:
--- Quote from: luchog on February 15, 2014, 03:12:47 am ---I'm triggering on external event with dedicated pin, I need to isolate especific data for debug. --- End quote --- As mentioned many times already in this thread, the External Trigger is basically worthless (and a separate analog path from the digital triggers) - and could introduce timing errors to decoding. As Mark_O already posted - and as explicitly shown in the the DS2000 User Manual section on decoding (see attached image taken from manual) - protocol decoding should be teamed with the corresponding trigger. |
| luchog:
Hello Mark_O. Some more info: - As i can see, decode is not related to trigger at all but wave forms, you can even decode in auto triggering mode in the midle of a string. - The lines i draw are in the correct place, confirmed with LA1034 LOGICPORT tool that is decoding as expected. - I dont know how the scope knows the start bit, anyway it is doing it in not zoomed strings any kind of trigger. - In SPI i trigger with CS signal, sometimes with GPIO, edge or SPI trigger with same result in zoomed string. - In current string I can not trigger In RS232 mode because the scope suport up to 900Kb for trigger, the string is 2Mb. I don`t know if any parameter is wrong, but ... decoded data don“t match waveforms. sotos, firmware version is 02.01.00.03. marmad: - Where in the manual you can find this? "protocol decoding should be teamed with the corresponding trigger". - The image you refer is other topic, the case of not enough clocks. - After heavy use of decode function, i can asure that it is not dependant of trigger mode. Please see the new image, trigger SPI. Thanks. |
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