Hello AMMRLers,
We have a ~1995 DRX400 that has been running like a champ for many years. However, we recently started having an intermittent 120 Hz pickup signal. It usually shows up when you have a very large peak, but manually reducing the gain doesn't fix the problem. (Eventually it will just go away on its own, and then it will come back.) It's becoming more frequent, and we'd like to track down the source. We don't see the pickup signals for any X-nuclei spectra, or during water suppression. Our thoughts are receiver, some sort of power supply, or within the preamp.
Here's an example spectrum (with large water peak):
https://farm3.staticflickr.com/2898/14754231706_91496b8fa7_o.jpg
Thank you for your thoughts and input!
Sarah
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NMR Supervisor
Chemical Instrumentation Facility
Iowa State University
1234 Hach Hall
Ames, IA 50011
(515) 294-5975
Received on Tue Jul 29 2014 - 05:30:34 MST
