Experimental Physics and
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On Fri, 11 Dec 2020 at 22:33, Manoussakis, Adamandios via Tech-talk <tech-talk at aps.anl.gov> wrote: Thanks for the comments Michael, when you are dealing with hundreds of waveform records and the timestamps are being taken when each record is processed (I would assume these would all be off by some delay if multiple softIOCs are running) do you then just have a master time waveform to lineup all your other signals to t0? It seems the digitizer would have a time stamp of t0 for all of its signals but the epics records would not all align at the same timestamp since each one isn't processed at t0 to be timestamped. The EPICS Device Support needs to know the timestamp t0 (preferably sent with the data by the digitizer) and write it to each record's timestamp when it updates the record. In that case, by configuring their TSE to -2, all waveform records can use the digitizer timestamp. That timestamp can even be forwarded (using TSEL) through post-processing chains, so that processed data may still use the timestamp that the digitizer sent with the raw data at the beginning of the chain. Cheers, ~Ralph
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ANJ, 14 Dec 2020 |
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