Hi all,
I would contend that even if the magnet frequency has shifted, it shouldn't
change the tuning range of the probe. It could keep the system from locking
if it got too far out, but not change the tuning. Generally Bruker probes are
configured to have a tuning range of +/- a few MHz from the base frequency.
Changing the spectrometer frequency by 80 kHz should have really no effect
on your ability to tune the probe. Assuming it's a 5mm probe.
Have you tried tuning the probe manually with the atmm command? If you do
so, I would expect you can find which tuning adjustment is at its limit.
Also, do you have a spectrum analyzer or something similar you could use to
look at the tuning dip instead of the spectrometer? You could start atmm and
look at the tuning dip on the spectrum analyzer to make sure that the
spectrometer is functioning properly - you can adjust tuning and matching with
the atmm interface and watch the dip on the spectrum analyzer. If you can tune
it on the analyzer but not on the spectrometer, you might have a spectrometer
issue. If you can't tune it on either, then it's a probe issue.
My suspicion would be a failed component in the probe, and it probably needs
to go back for repair. I would hope it was a failed solder joint or a bad
chip capacitor so it would be a simple repair.
Cheers,
Mike
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Received on Tue Jul 25 2023 - 08:59:22 MST