Dear all,
The lock problem is now resolved. One thing I did not mention (awfully remiss
of me and I apologise) was that the SGU board in position 1 was malfunctioning
and Bruker told me to simply replace it with the SGU board from position 4
since we do not use it and leave the SGU board that was in position 1 out.
After doing that we started having the shimming problems with deuterium. However,
I was doing shimming using 1H for some time after changing boards before I started
shimming with 2H and got the problems, so the mental connection was lost (also we
had shimming problems before changing the boards but very, very minor but the
suggestion was there that things were already playing up). The original SGU
board in position 1 was ECL01, while the other three SGU's are either ECL06 or
ECL07, so this complicated matters and no matter what permutation we tried
(board 1 in position 1, board 4 in position 1, etc.), we could not get things
to work. Eventually we put everything back to how it was and then 2H shimming
worked, so it seemed that all four boards needed to be in place for things to
work correctly (although the cf routine should have taken care of this I would
have thought). So now we have simply swapped around the malfunctioning board
in position 1 with the board that was in position 4 and we are operational.
Many thanks to all who responded. Some suggestions (straight quotes) which
may be of help in future cases:
"We had exactly this problem (we could not topshim on lock signal but could
topshim on 1H). We also received the same picture while trying to calibrate/measure
the deuterium 90-degree pulse. We identified that that was not the 2H signal but
some spurious signal - it was not at 4.7ppm but at 3.7ppm. In our case the culprit
was on TCU board, apparently the contacts oxidized on the cable connecting TCU
and the amplifier of the 2H channel. So, we cleaned the contacts of the T2 plug
and the real 2H signal showed up after this."
- Our signal was in the right place.
"The picture you sent looks like the lock might still be pulsing when you are
trying to measure the pulse length. For certain spectrometers (I think AVIIIHD
and older) you have to not only turn the lock off, but also set the lock power
to the minimum. The lock will continue pulsing otherwise and foul up your pulse
length measurements.
And if you have a L-TRX, it's not unheard of for the built-in 5W amplifier
to fail. This will cause the things you're seeing--and when you measure the
2H pulse you might find that it's much longer than you would expect."
- A noteworthy comment, I did double check that I had turned off lock etc.
and I got the same result with whatever permutation of board positions I had
at the time.
"The figure you sent of your attempt to measure the deuterium pulse length
looks like you are just seeing artifacts of some kind. I would say that you
might be having a problem with the preamp slice. But you can lock, so I'm
not sure what is happening here. Maybe something to do with the transmit/receive
switch in the preamp?
Have you had a look at the wobble curve on 2H?"
- Before we got back to normal the signal was either weak or very weak, and
was badly misshapen. Wobble curve was fine though.
Hope these might be of help to others in the future.
Regards,
Karel
________________________________________
> From: Karel Klika <karkli_at_utu.fi>
> Sent: 31 May 2023 09:44:13
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] AMMRL: lock problem
P.P.S.
The part no. of the board is Z13785 and the serial no. is 2. 1069
Thanks to Mike for the prompt.
Regards,
Karel
________________________________________
> From: Michael Groves <m.groves_at_utah.edu>
> Sent: 30 May 2023 21:19:13
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] AMMRL: lock problem
Hi all,
It might be a good idea to confirm part numbers as well as ECL levels. I think
at some point they added additional functionality to the 2H-TX and changed the
part number. If you had a newer one and swapped in an older one it could cause
loss of some functions. You might be able to find the part number in the BSMS
tool, or just pull the board out and check the part number on the sticker.
Cheers,
Mike
-----Original Message-----
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Karel Klika
> Sent: Tuesday, May 30, 2023 11:26 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] AMMRL: lock problem
P.S.
Our board is BSMS/2, ECL01. Not sure what version it could go up to, e.g. we
have SGU's ECL01, ECL06, and ECL07.
Many thanks to Martha for the prompt.
Regards,
Karel
________________________________________
> From: Martha Morton <mmorton4_at_unl.edu>
> Sent: 30 May 2023 19:58
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] AMMRL: lock problem
Karel,
Please tell us your ECL level for the 2H-TX board.
Martha
Martha Morton
Director of Research Instrumentation
Co-Chair, Department of Chemistry Safety Committee
University of Nebraska-Lincoln
4024726255<
tel:4024726255>
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Karel Klika <karkli_at_utu.fi>
> Sent: Tuesday, May 30, 2023 11:55 AM
> `To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] AMMRL: lock problem
Dear all,
Regarding the strange lock problem. many thanks to all those who responded
with suggestions. Still no closer to a resolution unfortunately.
I think it is the 2H-TX board, so anyone have such a board for a Avance 600
they are willing to part with ?
Also, I should apologize for the "2D" instead of saying "2H" or just "D" for
example which confused some people (deuterium or 2-dimensional ?), a bad habit
I picked up from a certain NMR program that I used to use a long time ago.
Many thanks.
Regards,
Karel
________________________________________
> From: Karel Klika
> Sent: 26 May 2023 13:26:12
> To: main_at_ammrl.groups.io
> Subject: AMMRL: lock problem
Dear all,
We have a problem with lock/topshim. We can lock fine on 2D, lock is normal
and S/N is good. If we run topshim on 1H all is fine. However, topshim on
2D fails and we get an error message saying no signal at all. Measuring a 2D
spectrum only provides a very weak signal. If I try and measure the 2D pulse
length it looks really weird (pic attached), the signal intensity does not
seem to change at all, but the phase is totally erratic. Any ideas what the
problem is and how to fix it ?
Many thanks.
Regards,
Karel
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