[time-nuts] FE-5680 frequency jump

[Magnus Danielson]

On 04/06/2013 09:34 AM, Attila Kinali wrote:
> On Fri, 5 Apr 2013 23:18:49 -0600 (MDT)
> "Don Latham"<djl at montana.com>  wrote:
>
>> Actually, mumetal easily loses permeability, hence shielding ability,
>> by mechanical stress or heat. Some mumetals are made to bend for boxes
>> and the like, sheets available from electronics goldmine, I think.
>
> Actually, one of the questions i had in my head when waking up this
> morning was: Mumetal is pretty sensitive to everything.. but how is
> it machined if bending and heating damage it?

As mentioned on this list, you re-anneal it again.

Bruce has more details.

http://en.wikipedia.org/wiki/Mu-metal
http://www.magnetic-shield.com/pdf/mu-2.pdf

Cheers,
Magnus