[3dem] high EMF

[Masahide Kikkawa]

Hi Alok,

When we installed a microscope at Univ. of Texas, Southwestern, there was a magnetic field fluctuation due to the movement of metal door near the microscope.

To cancel the fluctuation, we installed a cage to cancel it. It was quite effective. Although it was not a device installed near the objective lens, instead, it is a large cage surrounding the whole microscope.

> 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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