Difference: IssueS900num1 (1 vs. 2)

Revision 228 Nov 2005 - Main.DavidCowburn

 
DATE COMMENT
Deleted:
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Jan 1 2005 Drift 13 Hz
Jan 24 Drift < 5 Hz/h , met spin echo stability test
Feb 18 Drift about 4 Hz/h; phase and gradient stability tests to be completed
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new 1H LNA preamp module. Open Issue: Problem with 1H wobb. Occasional bug that requires the use of "ext50" flag. Bruker has sent a new 1H LNA preamp module. The new module seems to have corrected the problem, however it remains under evaluation.
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new TCU board. Open Issue: Problem with 3 axis gradshim. We have observed an occasional bug where there is no signal in one or the other of the two echo exeriments. When this occurs gradshim fails. Bruker has sent a new TCU board. This board seems to have corrected the problem, however it remains under evaluation.
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new RX22 board. Open Issue: Problem with CORTAB. Cortab fails. Bruker thinks the problem is in the RX22 receiver board, they are shipping us a new one. As a result of the implicaion of a problem with the receiver board we are evaluating if this is causing any problems during normal acquisition.
 
Sept. 2 Open Issue: Line shape stability test is not yet met. For this test the lineshape is monitored in an un-locked state. As this is followed a drift in Z1 is monitored. With autoshim on the drift in Z1 can be corrected during the experiment. Bruker has been contacted about this issue and we are working with them to resolve it.
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Sept. 2 Open Issue: Autoshim has a random failure when used with gradient experiment. This issue is linke to the issue above, as autoshim is required to maintain Z1. Again we have contacted Bruker to resolve this issue.
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Sept. 2 Open Issue: Autoshim has a random failure when used with gradient experiment. This issue is linked to the issue above, as autoshim is required to maintain Z1. Again we have contacted Bruker to resolve this issue.
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For previous items, see the earlier versions of this page.

 
META TOPICMOVED by="DavidCowburn" date="1132946782" from="Main.IssueS900" to="Main.IssueS900num1"

Revision 125 Nov 2005 - Main.DavidCowburn

 
DATE COMMENTup
Sept. 2 Open Issue: Line shape stability test is not yet met. For this test the lineshape is monitored in an un-locked state. As this is followed a drift in Z1 is monitored. With autoshim on the drift in Z1 can be corrected during the experiment. Bruker has been contacted about this issue and we are working with them to resolve it.
Sept. 2 Open Issue: Autoshim has a random failure when used with gradient experiment. This issue is linke to the issue above, as autoshim is required to maintain Z1. Again we have contacted Bruker to resolve this issue.
Feb 18 Drift about 4 Hz/h; phase and gradient stability tests to be completed
Jan 24 Drift < 5 Hz/h , met spin echo stability test
Jan 1 2005 Drift 13 Hz
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new TCU board. Open Issue: Problem with 3 axis gradshim. We have observed an occasional bug where there is no signal in one or the other of the two echo exeriments. When this occurs gradshim fails. Bruker has sent a new TCU board. This board seems to have corrected the problem, however it remains under evaluation.
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new RX22 board. Open Issue: Problem with CORTAB. Cortab fails. Bruker thinks the problem is in the RX22 receiver board, they are shipping us a new one. As a result of the implicaion of a problem with the receiver board we are evaluating if this is causing any problems during normal acquisition.
March 10 CLOSED: As of 4/14/05 this problem has not re-occured since installing the new 1H LNA preamp module. Open Issue: Problem with 1H wobb. Occasional bug that requires the use of "ext50" flag. Bruker has sent a new 1H LNA preamp module. The new module seems to have corrected the problem, however it remains under evaluation.
META TOPICMOVED by="DavidCowburn" date="1132946782" from="Main.IssueS900" to="Main.IssueS900num1"
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