Hi all,
Just my $0.02--the GAB/2 isn't smart enough to check the gradient circuit in
the probe--if it is going into an error state when you're not pulsing it
sounds like the GAB is bad. You can check the gradient in the probe--
if it's a normal room temperature probe you can check the resistance between
pins A-B and it should be around 1.5 ohms. And check the resistance to
ground--either from A or B to the center pin of the connector or to the shell
around the connector, and if it's not extremely high (it might take a few
seconds to ramp up to its final value) then there could be an issue with
the gradient shorting to ground. I suspect you'll find that's not the case.
I suppose I could imagine some pathological case where something was shorting
to the probe and creating a voltage somewhere there shouldn't be one--you
could always try resetting the GAB with the gradient cable disconnected and
confirming that it behaves the same.
Cheers,Mike
On Wednesday, July 3, 2024 at 04:17:08 AM MDT, Ulrich wrote:
Hello,
I had also troubles with the GAB board.
ha -> bsms -> gradients -> Gradient Amplifier Control
there on the control panel - are some buttons. There you can set the Gradient unit ON or OFF.
On the next page - you can do some diagnostic tests and Resets.
This helped me a lot. Or you can update the firmware for the GAB-Boad.
Via the BSMS Service Tools you can look, if the whole BSMS rack is OK or something is old.
Also you can easily access there the Firmware update routine for the GAB-Board, too.
gab2_fpga_00-013-02.bit is my actual firmware for the GAB/2 board.
The worst case is - the gradient is broken in the probe. There is a big round plug
outside of the probe.
This is the gradient plug. There you can easily measure the contacts through the
gradient. There should be a stable resistive value.
If it is broker - there are all contacts at 0 Ohm.
Yours sincerely,
Ulrich Haunz
Am Dienstag, Juli 02, 2024 21:02 CEST, schrieb "Bob Berno"
> Hello Anne,
>
> I have seen this and similar errors a few times in the past. On a few
> occasions it was a problem with the gradient circuit in the probe, and
> once it was due to a failure in the GAB board.
>
> From your symptoms, I think you have a problem with the GAB board.
> Do you know if the gradients work in any other experiments?
> What happens when you try to run an experiment with uses pulsed field
> gradients (PFGs) for coherence selection (most 2D experiments will be
> setup to use PFGs by default)? Do you see the lock level go down and
> then recover as the experiment runs?
>
> Good luck,
> Bob.
>
> On 2024-07-02 2:06 p.m., Anne Carroll via groups.io wrote:
> >
> >
> > Hello,
> > Please let me know if you have encountered this issue and how your
> > resolved it.
> >
> > In TopSpin 3.6.2, the issue manifests this error "TopshimRawCheck -
> > the Z gradient does not work" whenever we run gradient shimming.
> > Non-gradient shimming (topshim tune) runs fine. There is nothing wrong
> > with the probe.
> > When I reboot the Gradient Amplifier Board GAB/2 from the Service
> > Page, I hear a click and the Ready light on the board turns green. If
> > I Refresh the web service page while the light is green, the Board
> > State claims 'Operation.' Within a few seconds, I hear another click
> > and the Ready light goes out. Now the Refresh shows 'GAB_Error.'
> >
> > Thank you,
> > Anne Carroll
> >
> > --
> > Anne M. Carroll, Ph.D. (she/her) NMR/MS Instrumentation Specialist
> > Department of Chemistry and Biochemistry Miami University Oxford, Ohio
> > USA513-529-3163 Office 678-637-6739 Cell carrol50_at_miamioh.edu
> >
>
> --
> Dr. Bob Berno
> Manager, NMR Facility
> McMaster University, ABB-156
> 1280 Main St. West
> Hamilton, ON L8S 4M1
> T: 905-525-9140 x24158 or x24686
> -------------------------------------------------------------------------
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