It can be informative to connect an oscilloscope to the monitoring output of
the spin controller if it has one—you can see what the spin detection
signal looks like and if that might be the source of the problem.
And I’m not sure if this is applicable in your situation but some of
the smaller MAS probes I’ve worked on have a cap that screws into
the front of the stator. I forget if the 2.5mm probes I’ve worked
on have that or not. Regardless, if your probe does have such a cap, I’ve
found in a few cases that tightening that cap too much will stop the rotor from
spinning—if you loosen that just a hair sometimes the rotor will spin.
If you can give a bit more information about your hardware—manufacturer,
what type of spin controller, and any more details about your probe, that will
help us give more useful suggestions. There are many possible causes for a
non-spinning sample, ranging from a bad spin detection module, to the sample
not actually making it into the probe, to the user simply having forgotten to
flip the stator to the magic angle, to the MAS controller being configured
for a different probe.
Cheers,
Mike
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Garimella, Ravi
> Sent: Wednesday, September 6, 2023 11:02 AM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] 2.5mm spin problems
Hi spins,
Can you recommend any troubleshooting tips for spin problems ( not spinning
with good marking present at the bottom) for a 2.5 mm ssnmr probe?
Thank you,
_Best,
(Ravindranath Garimella PhD)
NMR Manager
College of Sciences Major Instrumentation Cluster (COSMIC) Facility
1104 Oceanography and Physical SCIENCES Bidg.,
4600 Elkhorn Ave.
Norfolk, VA 23529.
Email : rgarimel_at_odu.edu<mailto:rgarimel_at_odu.edu>
Ph : (757)683-3434
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Subject: Re: [AMMRL] 2.5mm spin problems
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Hi Ravi,
The spinning problem may be caused by different reason. For your reference
to do trouble shooting
1. you can try to spin an empty rotor and see if there is the same spinning problem.
2. If the empty rotor can spin well, then your spinning problem may be due to your
sample (not packing homogenously, or magnetic component)
3. You can take the probe out of magnet and test the spinning
4. If the empty rotor cannot spinning well either, the problem may be due to your
probe. You can clean the probe, stator, and also check the laser fiber. sometimes
broken/dirty fiber may cause problem. polish it.
5. .....
Good luck!
Banghao
Banghao Chen, PhD.
FSU-NMR Facility Director
Department of Chemistry & Biochemistry
Florida State University
102 Varsity Way, Tallahassee, FL 32306
Phone: (850) 644-3334
Email: chen_at_chem.fsu.edu
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Garimella, Ravi <rgarimel_at_odu.edu>
> Sent: Wednesday, September 6, 2023 1:02 PM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [AMMRL] 2.5mm spin problems
Hi spins,
Can you recommend any troubleshooting tips for spin problems ( not spinning
with good marking present at the bottom) for a 2.5 mm ssnmr probe?
Thank you,
_Best,
(Ravindranath Garimella PhD)
NMR Manager
College of Sciences Major Instrumentation Cluster (COSMIC) Facility
1104 Oceanography and Physical SCIENCES Bidg.,
4600 Elkhorn Ave.
Norfolk, VA 23529.
Email : rgarimel_at_odu.edu
Ph : (757)683-3434
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Hi Ravi,</div>
<div style=3D"" class=3D"elementToProof">
<br/>
</div>
<div style=3D"" class=3D"elementToProof">
The spinning problem may be caused by different reason. For your reference =
to do trouble shooting</div>
<div style=3D"" class=3D"elementToProof">
<br/>
</div>
<div style=3D"" class=3D"elementToProof">
<ol data-editing-info=3D"{"orderedStyleType":3,"unorderedStyleT=
ype":1}" data-listchain=3D"__List_Chain_68">
<li style=3D"list-style-type: "1) "; ;"><span>you can try to spin a=
n empty rotor and see if there is the same spinning problem.
<br/>
</span></li><li style=3D"list-style-type: "2) "; ;"><span>If the em=
pty rotor can spin well, then your spinning problem may be due to your samp=
le (not packing homogenously, or magnetic component)</span></li><li style=
=3D"list-style-type: "3) "; ;"><span>You can take the probe out of =
magnet and test the spinning<br/>
</span></li><li style=3D"list-style-type: "4) "; ;"><span>If the em=
pty rotor cannot spinning well either, the problem may be due to your probe=
. You can clean the probe, stator, and also check the laser fiber. sometime=
s broken/dirty fiber may cause problem.=C2=A0 polish it.</span></li><li sty=
le=3D"list-style-type: "5) "; ;"><span>.....</span></li></ol>
<div>Good luck!</div>
<div><br/>
</div>
<div>Banghao<br/>
</div>
</div>
<div style=3D"" class=3D"elementToProof">
<br/>
</div>
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<div style=3D"">
<br/>
</div>
<div id=3D"Signature">
<div>
<div style=3D"">
<span style=3D""><b>Banghao Chen,
</b></span><span style=3D"">PhD.</span><b><br/>
</b></div>
<div style=3D"">
<span style=3D"">FSU-NMR Facility Director</span><br/>
</div>
<span style=3D""></span>
<div style=3D"">
<span style=3D"">Department of Chemistry & Biochemistry</span></div>
<div style=3D"">
<span style=3D"">Florida State University</span></div>
<div style=3D"">
<span style=3D""></span><span style=3D"">102 Varsity Way, Tallahassee, FL 3=
2306</span></div>
<div style=3D"">
<span style=3D"">Phone: (850) 644-3334</span></div>
<div style=3D"">
<span style=3D"">Email: chen_at_chem.fsu.edu</span><br/>
</div>
<div style=3D"">
<br/>
</div>
<div style=3D"">
<br/>
</div>
</div>
</div>
</div>
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erif" style=3D"" color=3D"#000000"><b>From:</b> main_at_ammrl.groups.io <ma=
in_at_ammrl.groups.io> on behalf of Garimella, Ravi <rgarimel_at_odu.edu>=
;<br/>
<b>Sent:</b> Wednesday, September 6, 2023 1:02 PM<br/>
<b>To:</b> main_at_ammrl.groups.io <main_at_ammrl.groups.io><br/>
<b>Subject:</b> [AMMRL] 2.5mm spin problems</defangedfont>
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<p class=3D"x_MsoNormal">Hi spins,</p>
<p class=3D"x_MsoNormal">=C2=A0</p>
<p class=3D"x_MsoNormal">Can you recommend any troubleshooting tips for spi=
n problems ( not spinning with good marking present at the bottom) for a =
=C2=A02.5 mm ssnmr probe?</p>
<p class=3D"x_MsoNormal">=C2=A0</p>
<p class=3D"x_MsoNormal">Thank you,</p>
<p class=3D"x_MsoNormal">_Best,</p>
<p class=3D"x_MsoNormal">=C2=A0</p>
<p class=3D"x_MsoNormal"><span style=3D"">(Ravindranath Garimella PhD)</spa=
n></p>
<p class=3D"x_MsoNormal"><span style=3D"">NMR Manager</span></p>
<p class=3D"x_MsoNormal"><span style=3D"">College of Sciences Major Instrum=
entation Cluster (COSMIC) Facility</span></p>
<p class=3D"x_MsoNormal"><span style=3D"">1104 Oceanography and Physical SC=
IENCES Bidg.,</span></p>
<p class=3D"x_MsoNormal"><span style=3D"">4600 Elkhorn Ave.</span></p>
<p class=3D"x_MsoNormal"><span style=3D"">Norfolk, VA 23529.</span></p>
<p class=3D"x_MsoNormal"><span style=3D"">Email : rgarimel_at_odu.edu</span></=
p>
<p class=3D"x_MsoNormal"><span style=3D"">Ph : (757)683-3434</span></p>
<p class=3D"x_MsoNormal">=C2=A0</p>
</div>
</div>
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Received on Wed Sep 06 2023 - 10:47:26 MST