topshim failed的问题？

lynnsu · 发表于 2009-2-10 10:44:02

1.最近仪器频繁出现topshim失败的问题，原因是“singnal to noise is too low”，咨询工程师说是场太差，需要用90%H2O+10%D2O，重新做topshim 3D，开始管用，现在也没用了，有哪位高手指点下？另外这个问题出现的原因是什么？要怎么解决呢？

2.还有个问题：怎么优化lock参数？edlock直接修改可以吗？具体步骤应该是怎么样的？还有shim匀场参数？请高手指点，谢谢！

topshim · 发表于 2009-2-11 01:29:27

1. lock field shifted? lock phase correct? what is lock power? is correct solvent always choosed when locking?
2. tuning/matching is OK?
3. spinning is on or not? what is airflow?
4. topshim1d failed for all the solvent or specific solvent?
5. swap SGUs in edasp and run topshim to see if there is any difference. I saw one of this kind of problem caused by bad SGU. This can be confirmed by any recent sensivity loss in experiment

it is easy to change setting in edlock, and confirm the saving with a password when exiting.

lynnsu · 发表于 2009-2-13 08:34:32

我想起来，是不是因为经常不锁场的原因，另外一个人用核磁，他经常会不锁场？

lynnsu · 发表于 2009-2-13 08:37:42

还有，感谢指教，呵呵，我现在会bsms设置锁场参数和匀场了，不过还是软件好用:)

topshim · 发表于 2009-2-13 08:51:19

以下是引用lynnsu在2009-2-13 8:34:32的发言：

我想起来，是不是因为经常不锁场的原因，另外一个人用核磁，他经常会不锁场？

If you don't "tell" instrument what solvent to lock, topshim1d won't work properly

lynnsu · 发表于 2009-2-13 21:16:08

我的意思是如果机器空闲的时候不锁场会不会造成场漂呢？机器有时候不做样的时候长时间不锁场。

topshim · 发表于 2009-2-13 22:14:46

以下是引用lynnsu在2009-2-13 21:16:08的发言：
我的意思是如果机器空闲的时候不锁场会不会造成场漂呢？机器有时候不做样的时候长时间不锁场。

major field shift only happen after new installation or certain hardware change. the minor shift, however, happen all the time. If the shift is still within the range which can be handled by lockshift. The autolock should take care of the lock for you, otherwise you have to use your CDCL3 sample to locate the lock signal right in the middle of lock window, and update the field value using edlock.

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