UW CHEMISTRY NMR
Announcments & Equipment Logs
June, 2021
TIPS – GETTING THE MOST OUT OF YOUR SHIMS – AV500 AS AN EXAMPLE
The majority of lock solvents used in our facility are fully deuterated i.e. 99.0% or more 2H enriched. This means that the Topshim system performs what is called ‘1D gradient shimming’ or ‘Z-axis only’ shimming. This leaves the job half-done when it comes to shim optimization. The XY-plane or ‘transverse plane’ shims also need adjusting, […]
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ALERT ! AV500 OK – WITH IMPORTANT CHANGE – PLEASE READ !
CURRENT STATUS : First I will highlight that the sporadic Topshim problem is gone now and the shimming is behaving as expected. That should come as a relief to all of you who exclusively use 2H lock solvents other than (H2O+D2O) or (CH3OH+D2O). IMPORTANT – PROBEHEAD CHANGED TO BBI In the process of system troubleshoot, […]
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ALERT ! AV500 – TOPSHIM OCCASIONAL ISSUES
Since the majority of lock solvents used for routine NMR on this instrument are fully dueterated, for those users, the Topshim routine heavily relies on the ability to get good 2H NMR signal response from the hardware. Following reports of sporadic failure of Topshim, I have done a bit of deeper digging and there is […]
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UPDATE : AV500 – SAMPLE HANDLING IS FINE – NO PROBLEMS DETECTED
This is the second instance where I saw a post saying that sample couldn’t be ejected. But I didn’t detect any issues per se and all the vitals of the instrument are normal. If users need some clarification and refresher as to how the sample eject/inject sequence works and what are the possible ways one […]
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UPDATE ! : AV500 – SAMPLE HANDLING IS NORMAL
Sample eject anomaly reported by folks today morning is resolved now. Along with it, I have also checked the general health of the instrument and all vital signs are normal. NMR Facility Manager 6/8/2021
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UPDATE : AV500 – IS BEHAVING NORMALLY
In continuation of today morning’s instrument log post, I can confirm that the ‘wobb’ function as well as the ‘Topshim’ functionality works just fine. I will also add that the probehead is tuning as expected as well for the 1H channel. I have also run some test runs and the overall behavior of the probe […]
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