Hi Beth,
Other than taking the cover off the probe and having a look there are a couple
of things you could check out.
You could try tuning the probe outside the magnet--sometimes these motors get
magnetized and won't turn in a magnetic field, but when you take it out of the
magnet it starts working again. This is normally a sign that the
ATM unit on the probe needs to be replaced.
And I would run atmm and have somebody listen to the tuning motors--does the
motor sound like it's moving normally, which would indicate a broken tuning
rod? Or is there any grinding, or does it sound like the motor's not
moving at all? If it is a broken tuning rod, one place they break are
in the little ceramic tips that go into the motor unit--I'm not sure where
you would source one of those except for the manufacturer.
If it's an iProbe I wouldn't recommend messing with it--these are different=
enough from the normal probes that there's really not much that you can do
with it even if you could get the cover off... If it's a square bottomed
probe, don't forget to back off the screws that hold the cover tight, before
you take the cover off. If it gets jammed up, don't yank on it.
(it's been done before...)
And I'm not sure I'm allowed to recommend third-party probe repair people...
Cheers,Mike
On Friday, September 27, 2024 at 03:42:10 PM MDT, Beth Moscato wrote:
Hi
We have a 400MHz Bruker room-temp BBFO probe which has stopped tuning on the
1H channel. ATMA can’t find a dip, and I don’t see a change
in the profile upon adjusting the tune manually using atmm (let alone a dip).
The probe tunes and matches fine on the X-channel, and adjusting the match on
the 1H channel changes the profile I’m detecting (although still, no
dip). This is true for several samples of different solvents (CDCl3, DMSO, D2O).
X-channel is tuned to 13C, so it’s not a problem of 19F detuning the 1H channel.
A backup probe tunes and matches just fine, so the problem is clearly the 1H tuning.
I have two questions:
- Is there anything we can do that might *easily* fix this in-house? It
seems like either the tune rod is jammed somehow and won’t twist (which
we might be able to easily fix) or that the screws have been stripped (more
difficult repair and probably not worth attempting).
- Does anyone have third party vendors they would recommend for probe repairs?
We are in the Philadelphia area, if that matters.
Thank you guys for any advice!
Beth Moscato
Temple University
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Received on Mon Sep 30 2024 - 05:39:21 MST