>Date: Thu, 10 Feb 2000 08:30:16
>To: Quincy Teng <teng_at_sunchem.chem.uga.edu>
>From: Marc Stchedroff <stchedro_at_silver.ch.unito.it>
>Subject: Re: wrong chemical shift on AC300
>
>At 18.43 09/02/00 -0500, you wrote:
>>Thanks for those who have replied my message.
>>I have done the following before I sent my message:
>>reinput base frequency with 'cf',
>>run experiment using diiferent spectral windows of 20,40,60ppm,
>>I got same chemical shift value, 8.18ppm. So, the problem is not caused by
>>folded peak or wrong base frequency. The magnetic field should be same as
>>before because 2H lock sinal is correct. I guess we could win a nobel
>>prize if we solve this problem.
>>Thanks,
>>
>>Quincy
>>
>Uh!
>
What I don't understand is how the TMS is still at zero.
However, this could be a digitizer problem, with the changes in sampling
rate not being correctly interpreted during the FT. Try powering the whole
thing down and then starting it again and see what happens, very often these
kind of problems (with AC's)just go away after a power cycle (stuck bit in
the bus, usually down to a dying latch or off voltage)! However if it is the
digitzer board this could be expensive. I am seeing a lot of, perfectly
servicable, AC/AM/Aspect300 lying around, so I would post an appeal for parts.
>
>Good luck
>
>Marc
>
Received on Thu Feb 10 2000 - 08:57:05 MST