Hi David,
By far the most common cause of this is that either the routing in the
experiment is wrong or somebody miscabled something or somebody forgot to
tune the probe. Usually you get this when the amp detects a lot of
reflected power--the fact that increasing the pulse length made it pop up
indicates that you were probably close to the limit with the 10us pulse.
So anyway the first things I would do would be to make sure all the cables
are connected properly and in good shape. I would make sure the routing
in edasp was correct, and check probe tuning, and I would probably try running
a popt to check the 13C pulse--you could also just run it until you start
getting the mismatch errors and see at what point that starts.
If you've got an ASTM sample or 10% EB you could run the 13C sensitivity
measurement to try to get an idea if you've got a reasonable pulse
calibration or not--if a lot of power is being reflected then the pulse
length will be off and you won't get good sensitivity.
The next step would be to see if you can figure out where the power is being
reflected and what needs to be done to take care of it. One other thing
while I'm thinking about it--sometimes capacitors in the probe heat up when
they get pulsed on and change the tuning. So one thing you could check
would be to tune the probe, pulse a few times, and then run either wobb or
atmm to check tuning and see if it's moved.
Cheers,Mike
On Thursday, May 30, 2024 at 12:04:49 PM MDT, D'Anciaes Almeida Silva, Igor wrote:
Hi David,
I never saw this particular error, but it could mean that the power level for
p1 is too high for 30us.
> From: main_at_ammrl.groups.io on behalf of David Richardson via groups.io
> Sent: Thursday, May 30, 2024 12:59 PM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [AMMRL] Avance III amplifier error #Bruker #Hardware #NMR_Liquids =
Hi all,
Encountered an error I have never seen before. Amplifier on an Avance
III is giving a "Mismatch Fault General Gating Fault" error (see attached
image).
History: Instrument has been running fine (mostly H1, C13, P31, Si29).
I went to run an HSQC (hsqcedetgpsisp2.3) and encountered that error shortly
after the acquisition started. Figuring I would tackle that another day,
I switched pulse sequences (hsqcdietgpsisp). That experiment at least
ran to completion, but with no correlations. Went to double check the
C13 pw90. Switched to zg pulse sequence and ran a scan at my calibration
(10us). Looked normal. Changed p1 from 10us to 30us to ensure the
peak inverted and I was at least reasonably close to 90/270. Simply
changing p1 from 10us to 30us caused the gating error to show up again (this
was reproducible).
Not very sure where to go from here. Any one able to provide some
insight please?
Regards,
David
david.richardson_at_ucf.edu
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Received on Thu May 30 2024 - 11:47:31 MST