Experimental Physics and
Industrial Control System

Javier Cereijo García via Tech-talk <tech-talk at aps.anl.gov> · Thu, 20 Feb 2020 09:40:06 +0100

Hi all,

Yes, here at ESS we have done some tests in the lab in the past,

although they were quite simple. I can share what we have learnt. These

tests were done using mTCA-EVR-300 and mTCA-EVM-300, not VME.

The first feeling is that everything works as expected, and changing the

target delay works smoothly, as well as changing the length of the

optical fiber. There is one thing though that seems strange to me, and

it is that the target delay must always be set so that it is greater

than the physical delay, including internal delays. Otherwise some

events will be missed. Even when using a 230-series EVG with the delay

compensation disabled on the EVR side the target delay needs to be set

correctly.

We didn't perform any complex jitter test, although monitoring the "DC

lock" shows that it gets unlocked from time to time, usually recovering

quickly. We didn't worry too much at that moment, the measured delay

wasn't changing that quickly, I think that the lock monitor is quite

sensitive. I can't recall from the top of my head if we were using the

EVM's fractional synthesizer or an external RF source, so this may

easily disappear in a more stable environment.

We are starting the commissioning phase soon so we will have better results.

Best regards,

Javier

On 19/02/2020 18:17, Michael Davidsaver wrote:

On 2/18/20 10:43 AM, Shen, Guobao via Tech-talk wrote:

Hi all,

Is there anyone who has been using MRF EVM-300 delay compensation function for any purpose, in the lab, test stand, real machine, etc?

ESS did some testing as well.

If yes, would you mind to share us your experience?

As I recall, it worked well on a test stand.  My personal knowledge ends there.

Thanks,

Guobao

--------

Guobao Shen

gshen at anl.gov <mailto:gshen at anl.gov>

Controls Group Leader

Advanced Photon Source

Argonne National Laboratory

9700 S. Cass Avenue, Lemont, IL 60439

--
Javier Cereijo García

Embedded System Engineer
HW&I group, ICS division
European Spallation Source ERIC

Mobile: +46 (0)72 179 23 34
E-mail: javier.cereijogarcia at ess.eu

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System