[dsg-hdice] question on multiple cycles in fsNMR program?

[Tyler Lemon]

Hello Xiangdong,

Since you haven't yet replied, below are thoughts on my previous question about whether it matters to perform multiple full frequency sweeps rather than one frequency sweep acquiring multiple data points at each frequency.

The biggest advantage I can think of for moving to multiple acquisitions at each frequency is that it speeds up completion of the program since the major sources of delay in the program are it auto-adjusting the lock-in amplifier gain. The program can acquire sequential data points at a faster rate than it can switch frequencies and acquire the next point.

>From a pure data and mathematical stand point, the two options should return the same data. The only reason I can think of that you'd want to still perform multiple full frequency sweeps, is that you also want to observe changes in the target's response over the multiple sweeps.

If it doesn't matter which acquisition method is used, I will test both to see the overall DAQ speed and see if the results are actually comparable.

-Tyler


________________________________
From: Tyler Lemon
Sent: Friday, April 3, 2020 1:59 PM
To: dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: question on multiple cycles in fsNMR program?

Hello Xiangdong,

Is there there a benefit of running multiple complete frequency sweeps in the fsNMR program?

For a simplified example, if you want to do 50 scans over the frequency range 50 kHz - 60 kHz in 10 kHz frequency steps, using the methods below, would Method 1 (how FRS program does it) give different/more desirable final results than Method 2?

Method 1: Set frequency to 50 kHz and acquire one measurement; switch to 60 kHz and acquire one measurement (end cycle 1); repeat process 50 times; end program.

Method 2: Set frequency to 50 kHz and acquire 50 measurements; set frequency to 60 kHz and acquire 50 measurements; end program.

Unless there is some behavior that needs to be observed by the frequency actually sweeping multiple times, I do not see how the end result of Method 1 and Method 2 would be different.

Best regards,
Tyler
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hdice/attachments/20200407/2013529b/attachment-0002.html>