Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Thu, 6 Dec 2012 16:29:08 -0800

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 <[email protected]> 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
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System