Hello,
I wish to thank colleagues Jerry, Boris, Tim, Glenn, Rajan and Michael
from Bruker for the advises, and help.
There were opinions about electrical failure, routing problems and
uncorrect filters.
The rechecking of the system and analysis showed that there should be
internal problem with the preamplifier, which needs repairement by Bruker.
Many thanks!
Vahur
> -----Original Message-----
> From: Vahur Mäemets [mailto:vahur.maemets_at_ut.ee]
> Sent: Wednesday, December 03, 2008 12:31 PM
> To: ammrl_at_ammrl.org
> Subject: AMMRL: 19F preamlifier
>
> I have a weird problem with our AV-II 200 and HPPR preamplifiers.
> For fluorine we can use X-BB19F-2HS preamplifier or selective 19F
> preamplifier.
> If to use the first one, with QNP probe and TFT testsample S/N around
> 85 is very easy to achieve. If to recable HPPR for 19F module then at
> the same conditions the S/N is only around 5 !!
> 90 deg pulses are nearly the same for both setups.
> Has someone seen a similar problem or has idea what is wrong?
> Many thanks
>
> Vahur
>
>
>
> --
> Vahur Mäemets
>
> University of Tartu
> Jakobi 2, 51014,
> Tartu, Estonia
Received on Mon Dec 08 2008 - 00:47:18 MST