Hi,
did you try stopping sample rotation?
best
> Our 500 MHz Bruker Avance II spectrometer has developed an issue: an
> oscillating wave superimposed on the WOBB tuning curve. The wave has
> a frequency of roughly 150-160 kHz and appears for both 13C and 1H
> tuning.
>
> The oscillating wave remains when I disconnect the RF cables between
> the HPPR and probe, and the RF cables between the HPPR and
> amplifiers, and if I swap SGUs (2 with 4, 1 with 3).
>
> The wave is present but stops oscillating if I disconnect one or both
> of the TUNE-IN or RF-OUT cables at the back of the HPPR. Same
> behaviour if I disconnect one or both of the RF_IN or LO_IN cables on
> the RXAD-600 board.
>
> I’d be grateful for any advice/suggestions!
>
> Thanks,
> Sameer
>
> --
> Sameer Al-Abdul-Wahid, Ph.D. | Manager
> Nuclear Magnetic Resonance Centre | Universiy of Guelph
> 50 Stone Rd | Guelph, ON | A0N1G | CANADA
> 519-824-4120 Ext. 58914 | s.wahid_at_uoguelph.ca
> http://nmr.uoguelph.ca/
>
>
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Received on Mon Sep 18 2023 - 06:41:39 MST