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<== Date ==> <== Thread ==>
Subject: Is there any chance that I can change SCAN parameter dynamically?
From: "Zhichu Chen" <[email protected]>
To: [email protected]
Date: Wed, 31 Oct 2007 21:50:50 +0800
Hi all,

It's an interesting story. I've written an EPICS program and gotten it run on an oscilloscope partly successfully and used EDM to get waveforms and set parameters through CA.

What I mean by "partly" is, I used a fanout record to get waveforms from four channels and set it scan periodically, say "1 second," and it works fine unless the time scale is bigger than 0.02---0.02 is fine and 0.05 will make the oscilloscope stun until I set the time scale back to less than 0.05.

Finally, I figure out and set the SCAN field of the fanout record to "5 second" and it works again. So I guess, since time scale is 1/10 of the whole waveform---whose unit is "second"---and there're four waveforms I registered. So it will take 40*timescale to get all I want because I've told that my product---DPO7054---used only one probe for all four channels. Before I get the waveform, the buffer is locked and will never refresh in my case.

I know I can set SCAN to a very big number but, when the time scale is small, I think it's not efficient then. I'm just wondering whether I could use another record to control it, or something alternative.


Thanks for any input.

--
Best Regards
Chen
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          Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
         No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
             tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
                                               | www.sinap.ac.cn
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Replies:
Re: Is there any chance that I can change SCAN parameter dynamically? Ned Arnold
Re: Is there any chance that I can change SCAN parameter dynamically? Luedeke Andreas
Re: Is there any chance that I can change SCAN parameter dynamically? Emmanuel Mayssat
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