[time-nuts] LF power supply noise

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jun 20 19:06:32 EDT 2009


Magnus Danielson wrote:
> lstoskopf at cox.net skrev:
>> Again, you might try electronic goldmine's mu metal shielding.  Used
>> to be used as a shield around CRTs, etc.  Their version is sticky on
>> one side so might make a good trial wrap.
>
> I has issues with the big permanent magnet of one of my speakers made
> one of my screens going all strange in colours. I had some backsides
> from a pair of racks which I put inbetween, and the steel was doing a
> good job as finding a better path for the magnetic fields than through
> my screen.
>
> Maybe you should put a few slabs of steel around that HP543310A to at
> least guide most of the magnetic fields back into the core.
>
> Cheers,
> Magnus
>
If the magnetic field is too high the mu metal will saturate so using a
high saturation ferromagnetic material to reduce the field seen by the
mu metal itself may be necessary.

One has to be careful in the selection of the steel to be used as some
alloys can be only weakly ferromagnetic.

Bruce





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