Re: AMMRL: acqstatus.j1101

From: DeRose, Eugene (NIH/NIEHS) [C] <"DeRose,>
Date: Thu, 25 Jun 2009 12:39:45 -0400

Hi Jack,

We have seen this problem on one of our Inova 600s running VnmrJ 2.1B. In
our case, the problem occurs with dsp='n'. In fact, I had to remove the DSP
board to eliminate "number of points not equal to np" error messages.
These messages persisted even after replacing the entire digital card cage.

The acquisition error 900 occurs intermittently. Varian has suggested
replacing the DAC board, but since we just replaced the entire digital card
cage a few years ago, we decided not to pursue this option. The error
message has not appeared in the last few months, since we have been running
a lot of long 2D and 3D experiments. The problem appears most frequently
after the spectrometer has been idle for a few days.

Best Regards,
Eugene

Eugene DeRose, Ph.D.
NIEHS NMR Laboratory Manager
Global Health Sector
SRA International, Inc.
Contractor to NIEHS/DIR
National Institute of Environmental Health Sciences
Research Triangle Park, NC 27709
919.541.1981 voice
919.541.5707 fax
derose_at_niehs.nih.gov
www.niehs.nih.gov
www.sra.com
Enhancing Human Health Around the World Everyday

--
On 6/22/09 10:23 AM, "Jack Howarth" <howarth_at_nitro.msbb.uc.edu> wrote:
  I seem to be running into the bug described in
Varian's acqstatus.j1101 bug id concerning
experiments failing with acquisition error 900.
This only occurs on Inova consoles running dsp='i'
and seems to not occur when oversamp is set to
lower values (< 20). Our Inova 500 has VNMR J 1.1D
installed and our Inova 800 has VNMRJ 2.1B installed
so it seem to exist across software versions. We
also had or DAC board replaced in the last year so
the issue would still appear to exist in their
shipping DAC board firmware.
    I would be interested in hearing about the
experiences of others with this issue. The problem
doesn't occur routinely as we can go for weeks without
this issue manifesting itself. I am considering modifying
the go macro to limit oversamp to < 20 when dsp is set
to "i".
--
------------------------------------------------------------------------------
Jack W. Howarth, Ph.D.                                    231 Albert Sabin Way
NMR Facility Director                              Cincinnati, Ohio 45267-0524
Dept. of Molecular Genetics                              phone: (513) 558-4420
Univ. of Cincinnati College of Medicine                    fax: (513) 558-8474

Received on Thu Jun 25 2009 - 06:43:03 MST