Dear Lingchao
if you turn "sweep off" and acquire a 1H spectrum do you get a signal that
is in the expected region.
If you do not see a signal open up the sweep width to a very large number like
500 kHz and take another spectrum. Do you see something now?
Is the resolution of this signal reasonable.
Can you move the field value enough to get the signals to the correct position?
Do you now see the lock signal when you turn the sweep back on?
Clemens
On 9/11/2023 5:40 PM, Lingchao Zhu wrote:
Dear all,
We have a 300 NMR with AVANCE I console and the console is a microBay conso=
le. It is an old one and the 2H preamp is a board inside the console.
We had a problem with the lock signal because we couldn't find the lock signal
(resonance ring), either by manual lock(moving field value) or auto lock.
I checked the 2H wobb and found some weird wobb signals.
Sometimes it is good as below:
sometimes it is bad:
the worst case is:
No matter which status of wobb curve, it wouldn't lock the 2H signal.
1H and BB channel wobb curves look normal. I also replaced the 2H cable from
preamp to probe but that didn't help.
Ok, I started to replace all the fans in AQS and BSMS units because I know
temperature could cause weird lock issues. I even exchanged the SGU1 and SGU2
boards. None of these helped.
The lock out signal from 2H slice looks below and it seems normal:
I tried to take the cable 2H out from 2H-TX and move it to the L-TX board 2H-TR(bypass 2H-TX)
but still got the same problem.
My lock field is around 1800 and I can see the signal moving as I change the lock field values.
At this moment, I am running out of ideas. We still want to have this instrument running. Any
suggestion would be highly appreciated.
Thank you for your time and help.
Lingchao
--
Lingchao Zhu, Ph.D.
Academic Coordinator, ACIF
Department of Chemistry, University of California-Riverside
501 Big Springs Road, Riverside, CA 92521
Phone: 951-827-3628
Email: lzhu003_at_ucr.edu<mailto:lzhu003_at_ucr.edu>
--
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Received on Tue Sep 12 2023 - 03:41:08 MST