[dsg-hdice] NMR cycle timing

[Xiangdong Wei]

Hi Amanda,

Thank you for the message, it’s nice to hear that there are ways to reduce the NMR scan time. I think, based on my experience, we can go with the 25s+13,324 mode. Let me run some tests under these conditions and try to match the old calibrations, and then give you the right answer.

Best regards,

Xiangdong
________________________________
From: dsg-hdice <dsg-hdice-bounces at jlab.org> on behalf of Amanda Hoebel <amandah at jlab.org>
Sent: Wednesday, February 20, 2019 4:17:26 PM
To: dsg-hdice at jlab.org
Subject: [dsg-hdice] NMR cycle timing


Hi Xiangdong,


We looked at the time it took for each NMR cycle for fixed Tdown and Tup times (Tdown=Tup).  We also looked at the number of stored points for each cycle and graphed the points per second.  Both graphs are attached.  The dip in the timing which occurs after Tdown=Tup=30 seconds indicates a change in the lock-in amplifier's data acquisition rate.


The time for Tdown=Tup=25 seconds is 133 seconds with 13,324 data points.  The time for Tdown=Tup=30 seconds is 157 seconds with 15,857 data points.  Could the cycles be run at Tdown=Tup=25 seconds to make up for the timing difference between Windows 10 and Windows 7?  Dropping acquisition speed at Tdown=Tup=30 seconds to give a faster cycle time would give far less data points than running the cycle at Tdown=Tup=25 seconds (~8,000 data points).


Regards,

Amanda
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