Re: Tektronix 3014 Tracing Problem

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

> Is the scope triggering?

like :]]

Yeah, what's on the scope at the moment you take an medm screenshot? 

Can you run the following on the client machine:

echo $EPICS_CA_MAX_ARRAY_BYTES 

cainfo scopeTest:chan2scaledWF

caget scopeTest:chan2scaledWF

and send us the output?

It seems, since you are not able to get the waveform via caget, you won''t have it on the plot either (from what I can see you have zeros in the wf record, however this may also mean you haven't got your scope triggered, good point by Eric!). 

Also, try to reach the scope via web-browser and take a screenshot of the scope screen. 

From you screenshot I can see that you have time base 10ns, delay 1.36 ms, and TrigLevel 9.8Volts. Unless you manually trigger the scope (via button on the front panel), it doesn't seem reasonable to have such a high trigger level. Note aslo, that on the medm panel you have time base in microseconds.

On Sat, Dec 8, 2012 at 5:33 AM, Eric Norum <eric@norum.ca> wrote:

Is the scope triggering?

On Dec 7, 2012, at 5:35 PM, Trevor Downer <downtrev@isu.edu> wrote:

> Hello again!
>
> We were able to get the cartesian plot function to work.
>
> I attached a screenshot of the display after our success.
>
> Thanks for your help with that!
>
> The problem was with the MEDM installation, so I re-installed MEDM.
>
> We were able to make a cartesian plot correctly using another application.
>
> However, we still are not getting the trace data from the oscilloscope.
>
> I attached screenshot is of the result that I get when I run the caget
> command on one of the wave form records.
>
> This is the same result that I get for the other waveform records as well.
>
> We tried changing the EPICS_CA_MAX_ARRAY_BYTES variable in the
> environment, the envParams, and the st.cmd script from 10000 to
> 100000000, but to no avail as we are still not able to get a trace.
>
> We also tried changing the NELM field in the waveform records from
> 10000 to 100000 and bigger, and we had the same result.
>
> Any help that you can give us would be greatly appreciated!
>
> Thanks
>
>
>
>
>
>
>
> On Fri, Dec 7, 2012 at 12:10 PM, Hartman, Steven M. <hartmansm@ornl.gov> wrote:
>>
>> On Dec 6, 2012, at 11:51 PM, Yujong Kim wrote:
>>> We can control all main functions of the scope from EPICS MEDM OPI panels without any problem.
>>
>> Hi Yujong--
>>
>> To isolate whether this is an medm configuration issue or a CA configuration issue (e.g., EPICS_CA_MAX_ARRAY_BYTES), try to caget the waveform from the computer running medm.
>>
>> --
>> Steven Hartman
>> hartmansm@ornl.gov
>>
>>
>>

> <chan2ScaledWaveWF.png><oscope_with_cartesian.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

Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01