[time-nuts] FE-5680 frequency jump

Magnus Danielson magnus at rubidium.dyndns.org
Sat Apr 6 07:22:43 EDT 2013


On 04/06/2013 10:06 AM, Bruce Griffiths wrote:
> 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.

The link I just tossed in another message says 1121C.

Cheers,
Magnus


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