[dsg-hdice] Computer monitor

[Xiangdong Wei]

Amanda, 

I had a quick look of the FRS program yesterday and found a few issues. They may or may not be related to each other. 

1. Each time after starting the FRS from the VI, the first scan always produced wrong result. The detected signal amplitude was around 10^-7 or 10^-8 V regardless the power setting, and the phase was fluctuating between -180 and +180 degrees. Please see the picture 


"first_FRS scan_with_different_powers". The power settings were -63, -50, -30, -10, and 0dBm. 





2. Any scan after the initial produced a normal looking spectrum. Please see "first_and_second_FRS_scans" and " first_and_second_FRS_scans_zoomed_in ". The first scans are on the left, and the second are on the right. The power settings were -63dBm, -30dBm, and 0 dBm. 





The issue may be related to the program initialization. On the other rack, most parameters of the FRS program use last setting as defaults, except for RF power---which is always reset to -63dBm to avoid accidental target depolarization. The default value for the power should be always -63 dBm and confirmed after FRS program was loaded in. 





3. Some times the scan stuck at hunting the correct sensitivity windows, and the only way to move on was to use Windows Task Manager to kill the program. 




Since it was seen a few times for the other rack also in the past, it was not unique. It may be caused by some timing mismatch or wrong logic, I think. Please take a look. 





Further tests will be conducted later. 





Please let me know if you have any question. 





Thanks, 





Xiangdong 



Xiangdong Wei 

x-5266 


From: "Xiangdong Wei" <xwei at jlab.org> 
To: "Amanda Hoebel" <amandah at jlab.org> 
Cc: dsg-hdice at jlab.org 
Sent: Thursday, January 5, 2017 2:33:08 PM 
Subject: Re: [dsg-hdice] Computer monitor 

Amanda, 

I'm in the process to replace the NMR rack monitors now. The rack is done. The rack 2 monitor will be ready in a few days. We can replace the small monitor next week. 

Thanks, 

Xiangdong 



Xiangdong Wei 

x-5266 


From: "Amanda Hoebel" <amandah at jlab.org> 
To: dsg-hdice at jlab.org 
Sent: Thursday, January 5, 2017 1:39:48 PM 
Subject: [dsg-hdice] Computer monitor 

Hi, 

We are planning to put a temporary table with a computer monitor next to Rack 2 in the lab. It will be easier to read and debug the NMR program with a larger screen. 

Thanks, 
Amanda 
_______________________________________________ 
dsg-hdice mailing list 
dsg-hdice at jlab.org 
https://mailman.jlab.org/mailman/listinfo/dsg-hdice 

_______________________________________________ 
dsg-hdice mailing list 
dsg-hdice at jlab.org 
https://mailman.jlab.org/mailman/listinfo/dsg-hdice 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hdice/attachments/20170112/16d671a3/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: first_and_second_FRS_scans_zoomed_in.jpg
Type: image/jpeg
Size: 1460493 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-hdice/attachments/20170112/16d671a3/attachment-0006.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: second_FRS_scan_different_power.jpg
Type: image/jpeg
Size: 3398357 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-hdice/attachments/20170112/16d671a3/attachment-0007.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: first_FRS scan_with_different_powers.jpg
Type: image/jpeg
Size: 2377534 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-hdice/attachments/20170112/16d671a3/attachment-0008.jpg>