Dear David,
did you check the fans on top of the AQS rack already? Could be some boards
are overheating from time to time ...
Best regards
Bert
> Am 15.05.2023 um 05:19 schrieb daveonofrei_at_msn.com:
>
> Hello all,
>
> I'm really happy with the new home of this group since I think this makes
> it much simpler to ask questions and search for previous solutions to
> problems.
>
> I'm having a recurring issue with my 400 MHz Bruker Av I which works
> wonderfully except for a recurring and sporadic issue that has been happening
> for a long time. Data acquisition (even on 1D spectra) only partially acquire
> and I get an error that is always some variation on "zg: rcuerror: Scan speed
> overrides accumulation Increasing DW or D1, decreasing TD or switching off
> the FID display may help fifo cycles: 191 done, 66 missed, Lock anomaly during
> acquisition". This usually means that the acquisition only collected part of
> the data, and then "something" prevented it from finishing.
>
> The number of cycles finished/missed varies and sometimes this is accompanied
> by strange erratic spikes in the lock signal that persist even after acquisition
> has been manually stopped. I have replaced many boards on the AQS rack in pursuit
> of this white rabbit (specifically the TCU, RCU, GCU, and even one of the PSU
> units on the back) and while the frequency of the problems seems improved, it
> still happens randomly.
>
> Overall, acquisition still works ok with fewer NS and a TD0 of 4 (writes NS to
> disk for 4 loop.) That way some of the data is saved and processed. Otherwise it
> loses all the data. But I'd like to get to the bottom of this. Does anyone have
> any insight about what I might do to fix this issue once and for all? 1H spectra
> look really good on this system when it works and it's the only instrument with
> an autosampler so it's used for high throughput and really a pain to have to keep
> dealing with this. I wanted to keep this short but if anyone needs more information
> about this specific issue let me know.
>
> Best,
> David O.
>
>
> -------
> David Onofrei, PhD
> NMR Facility Manager
> Chemistry Department
> San Diego State University
> work: chem-nmr_at_sdsu.edu
> personal: donofrei2_at_sdsu.edu
>
Magnetic resonance equipment, service, training & more
Selling & buying used NMR equipment (all vendors)
Dr. rer. nat. Bert Heise
Owner, Applications Scientist
Spin-Doc Bert Heise
Kiefernweg 13
58239 Schwerte
Germany
Mobile: +49 171 5135315
Email: bert.heise_at_spin-doc.net <mailto:bert.heise_at_spin-doc.net>Web: www.spin-doc.net <http://www.spin-doc.net/>
Representing:
Stelar Fast Field Cycling NMR Relaxometers (www.stelar.it <
http://www.stelar.it/>)
MestreLab NMR Software (www.mestrelab.com <
http://www.mestrelab.com/>)
Barthel HF Amplifiers (www.barthel-hf.de <
http://www.barthel-hf.de/>)
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#117): https://ammrl.groups.io/g/main/message/117
Mute This Topic: https://groups.io/mt/98896832/7559972
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Mon May 15 2023 - 04:15:59 MST