Erasure is faster and more complete if the item being
erased is slowly moved through the coil while the coil
is activated. If simply left in the coil during activation
there is a good chance that some magnetization of the
item will remain. Moving the item through the coil
and then AWAY from the coil ensures that any remnant of
magnetization is very small.

Because the demagnetization coil usually has no core,
it will tend to get hot very rapidly.

Fr. Tom McGahee


>
> Wow!! Firstly, whats a DLT? And secondly it amazes me that
> you couldn't demagnetise a tape with a strong AC field.
> My bulk tape eraser is a lot stronger than the degauss wands
> we use on TV's. Some TVs have a metal frame that slowly gets
> magnetised by the earth's field over many years. These are
> hard to degauss. I use my bulk tape eraser, which always
> works although it might take a lot of minutes. That's
> annoying because of its low duty cycle.
>
> Surely a strong AC magnetic field WILL demagnetise
> anything if given enough time?? Hmm...
> -Roman
>
>

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