Hi Sameer,
It may be 60 Hz ripple, or multiples thereof, from one of the power supplies.
Best regards,
Jon
MR Resources, Inc.
The Leader in NMR Spectrometers, Services and Parts
160 Authority Drive
Fitchburg, MA 01420
http://www.mrr.com/
Tel: 978-345-9011
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Sameer Al-Abdul-Wahid
> Sent: Wednesday, September 13, 2023 4:45 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] Oscillating wave on WOBB curve
Dear AMMRL,
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 | University of Guelph
50 Stone Rd E | Guelph, ON | N1G 2W1 | CANADA
519-824-4120 Ext. 58914 | s.wahid_at_uoguelph.ca <mailto:s.wahid_at_uoguelph.ca>
http://nmr.uoguelph.ca/
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Received on Thu Sep 14 2023 - 09:52:33 MST