Re: [AMMRL] Oscillating wave on WOBB curve

From: Sameer Al-Abdul-Wahid <s.wahid_at_uoguelph.ca>
Date: Fri, 15 Sep 2023 18:36:22 +0000

Hi Jon and John,

Thanks for the suggestion - you’re right on the mark with the power
supply! We ran a rotor with a water insert and observed spikes at ±120,
240, 360, etc. Hz from the water peak. All our previous solids test samples
weren’t sharp/intense enough to produce observable spikes.

The 150-160 kHz frequency wave I originally measured in the WOBB curve was
misleading. When I doubled the number of wobble steps, the ‘frequency’
of the wave doubled as well.

Our console AC is from a UPS that also feeds two other spectrometers (with
no issues), so my first suspect are the AQS/2 power supplies, which are rather
old at this point.

Best regards,
Sameer

--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
519-824-4120 Ext. 58914 | s.wahid_at_uoguelph.ca<mailto:s.wahid_at_uoguelph.ca>
http://nmr.uoguelph.ca/


> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of johnhahn cazent.com <johnhahn_at_cazent.com>
> Date: Thursday, September 14, 2023 at 13:33
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] Oscillating wave on WOBB curve

Hi Sameer,

  I think Jon is on the right path....if this instrument has a switching power
supply, the ripple won't be 60Hz however...it will be in the vicinity of
140-180KHz depending on the load and design of the tank...do you have the
wherewithal to check the AC noise ripple on this instrument?

[cid:f60e667f-adff-4d1a-8a91-8a896c3a40a2]
Regards,
John E. Hahn

CAZ Enterprises, LLC
6320 Fly Rd. Ste 207
East Syracuse, NY 13057
Ph. 315-727-8192
http://www.Cazent.com



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Received on Fri Sep 15 2023 - 11:43:27 MST