[Dsg-hallb_magnets] TR817A2 at 325 K, LV cRIO restarted.

[Probir Ghoshal]

Dear All,

This has been discussed, reviewed and explained that we cannot use fixed voltage solution..!
This system is not designed for..
The cernox resistance changes from ~150 Ohms at 300K to ~70,000 Ohms at 4.2 K over the operational range.
This is based on the Power and constant current...

Rama - Please let Tyler set a fixed current say below 30-25K..Instead of I2-I1..!

Regards

Probir


----- Original Message -----
From: "Amrit Yegneswaran" <yeg at jlab.org>
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Glenn Young" <gyoung at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org>
Sent: Wednesday, April 19, 2017 6:04:33 PM
Subject: Re: [Dsg-hallb_magnets] TR817A2 at 325 K, LV cRIO restarted.

tyler, 
adding what you didn't mention in your e-mail: 
as we discussed in the dsg meeting today, are there plans to implement brian's fixed voltage solution? 
or are we going to continue restarting in the foreseeable future? 
amrit 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "Glenn Young" <gyoung at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org> 
Sent: Wednesday, April 19, 2017 5:15:36 PM 
Subject: Re: [Dsg-hallb_magnets] TR817A2 at 325 K, LV cRIO restarted. 

Hello Glenn, 

The table attached shows since January, 1 2017, which Cerenoxes have had the error, how many times a Cerenox has had the error, and the dates of the error. 

Best regards, 
Tyler 





From: "Glenn Young" <gyoung at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org> 
Sent: Wednesday, April 19, 2017 4:47:55 PM 
Subject: Re: [Dsg-hallb_magnets] TR817A2 at 325 K, LV cRIO restarted. 

Dear Tyler, 
Do we have statistics of which Cernox exhibit the 325k error? I.e. is it randomly distributed or are there a few specific ones that are most like to have the problem? 
Thanks, Glenn 

----- Original Message ----- 
From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org> 
Sent: Wednesday, April 19, 2017 4:10:47 PM 
Subject: [Dsg-hallb_magnets] TR817A2 at 325 K, LV cRIO restarted. 

Hello, 

TR817A2 was at 325 K this afternoon. The Torus LV cRIO was reset and the Cerenox now reads 4.75 K. 

I did not get a screen shot of the raw data from the error. I initially connected to the LV cRIO from a different PC than usual. This PC did not have the required LabVIEW packages installed, causing an error when connecting to the cRIO. This error stopped the program. After moving to the PC normally used for Hall B LabVIEW, the program was successfully restarted following the normal restart procedure. 

Best regards, 
Tyler 

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