Re: Tektronix 3014 Tracing Problem

[Pavel Maslov <pavel.masloff@gmail.com>]

Hey Travor,

Perhaps the reason of such behavior is the EPICS_CA_MAX_ARRAY_BYTES env. variable. Try to increase it to say 20000 or thereabouts.

On Fri, Dec 7, 2012 at 1:29 AM, Eric Norum <eric@norum.ca> wrote:

It sounds like you have two problems.   Generating an SDDS file is a separate issue from displaying waveforms in the MEDM window.
The fact that you see nothing in the plot region of the screen makes me think that there may be something wrong with your MEDM installation or the IOC that's acquiring the data.

To check the latter, you could try doing a 'camonitor' of one of the scope waveform records.  Do the numbers look reasonable?  Does the camonitor program produce a new waveform record each time that the scope triggers?

Have you ever been able to display a waveform record using the MEMD Cartesian Plot widget?  Try creating a simple MEDM screen with a Cartesian Plot widget that gets its value from a scope waveform record and see if you can see the values.
Have you changed the waveform record names so that the MEDM widget can't find the data?

On Dec 6, 2012, at 4:00 PM, Trevor Downer <downtrev@isu.edu> wrote:

> Greetings and salutations!
>
> I am a student at Idaho State University working on a project to
> control a Tektronix 3014 oscilloscope, using EPICS, for the Idaho
> Accelerator Center.
> We have successfully installed EPICS and the necessary extensions to
> communicate with the TDS3014 oscilloscope. Using medm we cannot see
> the waveform tracings, we can however see the tracings from a web
> browser, however its refresh rate is quite slow.
> There seems to be a problem when I click on the SDDS Plot button, medm
> outputs a message in the terminal reading:
>
> "medm/trace10k: line 8: [: T: integer _expression_ expected
> Usage: trace [1-4][HV or LL]<CR>\n"
>
> Attached is a screen shot of the traceless oscilloscope in medm and
> the trace10k file where there seems to be a problem.
> I would greatly appreciate any help to fixing the tracing problem,
> thank you very much!
>
> -Trevor Downer

> <Tds3000 without a trace.png><Trace Issue.png><Trace10k.png>

--
Eric Norum
eric@norum.ca

--
Best regards,


Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia

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