Dear Phil,
You are quite correct with xwin2.6 this is the case but with Xwin3.5
and TOPSPIN this is done automatically with the CF.
Nice to hear from you and hope you are fairing well in the States.
Best wishes,
Adrian
-----Original Message-----
From: Phil Dennison [mailto:dennison@uci.edu]
Sent: 28 February 2005 19:05
To: Adrian Bryant
Subject: RE: NMR cross talk
>Hi Chuck,
>
>It is our experience here in Bruker U.K. that is better
>to have a minimum of 70KHz between two spectrometers to avoid
>these problems. This is approximately the total field available on a BSMS
>Z0 range. This of course depends where your current field value is at the
>moment with regards to the BSMS field value. If necessary you may have to
>shift the frequency on both instruments.
>
>The procedure is quite simple. To see how much range you have you can
>measure
>a water peak at the current value on resonance and then adjust the field on
>the BSMS and then re-measure the water peak and measure the distance moved
>(do this unlocked with the field sweep off).
>
>>From there you can decide which way you which to move the basic frequency.
>For this do a CF and change the basic frequency to the one required from
>your
>previous test. This will generate a new absolute lock frequency relative to
>the new basic 1H frequency. It is important when you do the CF to update the
>nuclei table with the restore button for the new basic frequencies for all
>nuclei.
>
>Once this is done you need to adjust the BSMS field position by searching
>for
>the lock resonance (making sure that you have the correct solvent for the
>correct
>lock shift in the BSMS and then update the new field value in the BSMS
>table.
>
>Once done you will need to do an expinstall to update the standard parameter
>sets.
>Remember any of your own old data sets if read in will contain the old
>frequencies
>so remember to update these if you intend to use these.
>
>Good luck and best wishes,
>
>
>Adrian Bryant
>
Hi Adrian,
Is it also necessary to do 'cfbsms' to calculate the new digital lock
frequency after storing the new operating frequency with 'cf'? I have
a drifting 500 for which I update the frequency about once a year,
and I always do this. That is with XwinNMR 2.6.
Hope you're all doing well in Coventry,
Regards,
Phil.
-- Dr Phil Dennison NMR Facility Director (949)824-6010 (office) Department of Chemistry (949)824-5649 (lab) University of California, Irvine (949)824-8571 (fax) Irvine, CA 92697-2025 dennison@uci.edu USA________________________________________________________________________ The MessageLabs Virus Scanning Service on behalf of Bruker BioSpin Limited has scanned this e-mail for all viruses. ________________________________________________________________________
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