[3dem] high EMF
Marin van Heel
m.vanheel at imperial.ac.uk
Wed Jul 20 01:03:22 PDT 2011
Dear Alok,
We have had this type of dynamic field compensation in operation for our
CM300 FEG and CM200 FEG instruments for more than a decade and to our
full satisfaction. If I remember correctly the residual field
(50Hz/60Hz) is reduced to ~10% of its original value after correction.
This type of compensation is only ment to work for magnetic strayfields
generated by the 50/60 Hz mains.
Hope this helps,
Marin
On 20-Jul-11 7:55 AM, Alok Mitra wrote:
> Dear colleagues:
>
> The EMF measurements for the microscope rooms where our old T12 and
> the new TF20 (with GIF) are to be housed revealed values beyond the
> acceptable level. One of the remedial solution suggested is to utilize
> an active field cancellation device, which samples the field strength
> in real time and generates an opposing field to cance (placed near the
> objective lens)l. Does anybody have experience as to how well such a
> device performs? I will appreciate your input
>
> regards
>
> Alok
>
>
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--
================================================================
Marin van Heel
Professor of Structural Biology
Division of Molecular Biosciences
Faculty of Natural Sciences
Imperial College London
Flowers Building (G23)
South Kensington Campus
London SW7 2AZ, UK
Tel: + 44 (0)20 7594 5316
Fax: + 44 (0)20 7594 5317
e_mail: m.vanheel(A_T)ic.ac.uk
and:<vanheel.office(A_T)ic.ac.uk>
and: mvh.office(A_T)gmail.com
private email: marin.vanheel(A_T)gmail.com
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