[time-nuts] FE-5680 frequency jump

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Apr 6 04:06:55 EDT 2013


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?
>
>
> 			Attila Kinali
>
>    
By annealing it afterwards in a hydrogen atmosphere at around 400C.

Bruce


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