Re: [AMMRL] Frequency ocillation in wobb curve on Prodigy TCI probe

From: Michael Groves via groups.io <mgrovesnmr=yahoo.com_at_groups.io>
Date: Thu, 30 May 2024 18:51:51 +0000 (UTC)

 Hi Ken,

Maybe crosstalk in the preamps?  What if you turn the lock back on and
instead of disconnecting the 2H cable from the probe, you disconnect the input
from the back of the 2H preamp?  Have you tried a 2H stop filter on the
output of the BB preamp?  

Cheers,Mike

On Thursday, May 30, 2024 at 12:05:48 PM MDT, Kenneth Sharp-Knott wrote:

Thank everyone for the tips!

Initially I tried the suggestion to disconnect the lock cable from the probe
and there was no change.

However, and strangely, if I turn the lock off - the frequency oscillation goes
away.  So, it is lock related, but it's not coming down the lock cable...  

I feel this is a clue to the source of the problem...  What's the source???!

Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry 
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)


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Received on Thu May 30 2024 - 11:51:59 MST

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