Hello I recently bought a 335 Lakeshore temperature controller and I must control a cryo-target at 10k.
For some reasons (I pass details) I want to design my own controller based on my LakeShore 335 PID. In others words, I want to master “zeros” and “poles” of the closed loop system, through the LakeShore 335 PID.
I have identified my system and I got a few models of it. To achieve the control, I need to understand the LakeShore 335 PID. I can read in the manual some very basic stuffs about PID (elementary) and that the PID is a discret-time PID.
My question is : Does anyone have more information about this PID? I mean, its structure, where is it located in the loop (direct or feedback branch), the sample time Ts (to determine “z”) in use, the derivative time constant Tf, the discretisation method (“zoh”, “foh”, “Tustin”,..), etc...
Post by Lake Shore Jeff M on May 22, 2018 10:07:22 GMT -5
The information you are requesting regarding how Lake Shore implements our PID Control Algorithm is considered to be proprietary and not available to the public. If you wish to pursue this request, you will need to contact your Lake Shore Sales Representative so that they can work with you to establish a legal Non Disclosure agreement before we will provide the requested information
Thank you for answering. Well, I guessed that :/ I wrote to LakeShore in US but working in Russia, US forwarded my email to Cryotrade, since this company is the official LakeShore representative in Russia. Since, I am waiting an answer from them... But as usual, in Russia, I'll most likely never get any answer...
Hey David, this is Max - colleague of Dmitriy from Cryotrade. Be sure we are working over your inquiry. As your request is really unusual and concerned with questions of intellectual proprietary of LS - it takes time to figure out our possible steps. Dmitriy is working on it as he informed you and this have to be done in close connection with LS people. So please be patient. Hope we'll provide you with some info soon. And be sure Russia is varied - please do not use one color for everithing.