June 16, 2024, 09:08:43 PM
Forum Rules: Read This Before Posting

Topic: Leaving lock on on NMR  (Read 5106 times)

0 Members and 1 Guest are viewing this topic.

Offline azmanam

  • Chemist
  • Sr. Member
  • *
  • Posts: 1417
  • Mole Snacks: +160/-24
  • Mediocrity is a handrail -Charles Louis d'Secondat
Leaving lock on on NMR
« on: February 15, 2008, 09:47:00 AM »
We're using a Bruker NMR (300 and 400 MHz).

I know you're not supposed to leave the lock on after you take your sample out and leave, but what is the reasoning behind that?  Does it have something to do with the instrument trying to lock on a solvent that's not there?  And when the next person wants to take an NMR, if it's not the same solvent they'll load shim files for a different solvent - while the instrument is still trying to lock on the previous solvent?

Knowing why you got a question wrong is better than knowing that you got a question right.

Offline agrobert

  • Chemist
  • Full Member
  • *
  • Posts: 629
  • Mole Snacks: +69/-17
  • Gender: Male
  • diels alder
Re: Leaving lock on on NMR
« Reply #1 on: February 27, 2008, 09:09:33 PM »
I think it is so the calibration does not drift.  Although you always relock and shim, it is a reference point that lets others know the machine is working properly.
In the realm of scientific observation, luck is only granted to those who are prepared. -Louis Pasteur

Sponsored Links