Ulrike Werner-Zwanziger wrote:
>
> Dear Colleagues,
>
> we are preparing an area for a 200 MHz NMR spectrometer for our
> chemistry teaching laboratory. Since it has to go cheap, I would like to
> ask your opinion on the necessity of the following items. In particular
> I would like to know:
>
> -- Concerning fluorescent lights, do they cause problems? Which
> frequencies do they typically emit. (In the room I could detect 160 MHz,
> 125 MHz, 80 MHz, 64 MHz on the oscilloscope mostly related to a weather
> station.) Are these frequencies clean enough to cause identifiable
> spikes or do they vary? Is it worth the money to install a special
> low-RF light ballast (on 15 lights in the room)?
>
> -- Do you regard a separate earthing cable aside from the earth in the
> normal three prong connectors a worthwhile investment?
>
> -- Could you please comment on the effects to consider from conduits and
> piping in the ceiling close to the magnet.
>
> If there is interest, I can post a summary of comments later.
> Thank you very much.
>
> Ulrike
> --
> Ulrike Werner-Zwanziger
> Department of Chemistry
> Indiana University
> Bloomington, IN 47405
>
> Phone: (812) 856-4629
> Fax: (812) 855-8300
> WWW: http://nmr.chem.indiana.edu/~uwz
--=+=+=+=+=+=+=+=+=+=+=+=+=+=+= Jim Breeyear Univ of Vermont Manager, Inst. Chemistry Dept.