Hi all, I have a small system which has a magnetic field and I don't want it to be interfered by the external magnetic field around it.
I've read some document about this. And what I've got is that in case of a variable magnetic field, I should place a conductive plate on one side of the printed circuit board to reduce the effect of the external magnetic field based on the Eddy current. If the magnetic is static, I should use permeable material, which has the ability of re-routing the external magnetic lines, to cover my system completely. However, I don't want my system covered. So could you tell me some other potential solutions ? Thanks.

 

Don't place your system in the presence of external magnetic fields.

 

Hi all, I have a small system which has a magnetic field and I don't want it to be interfered by the external magnetic field around it.

Put it in an enclosure made of steel

 

If you can measure the interfering field properties you could try producing a counter-field to cancel it. Easy to say, tricky to do .

 

Hello,

You could use some mu-metal shielding:
http://en.wikipedia.org/wiki/Mu-metal

Bertus