Hi,
difficult to say.
About one year we had a similar issue. In our case inside the probe a tiny
cardan connector as part of the tuning rod inside the probe was broken. Tiny
mechanics, but in principle in house repair was easy.
If that is your case, there is a tiny possible pitfall. The tuning capacitor
has an end point. You don't need much force to break this end point. That's
why there is an additional endpoint at the bottom of the probe. You have to
move the lower and the upper point of the tuning rod into the same end
position, before you reconnect them.
Greetings
Rainer
________________________________
> From: main_at_ammrl.groups.io on behalf of Beth Moscato
> Sent: Friday, September 27, 2024 11:06:00 PM
> To: main <main_at_ammrl.groups.io>
> Subject: [AMMRL] BBFO probe won't tune
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:
1. 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).
2. 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 Sat Sep 28 2024 - 02:29:51 MST