>> 'isolation' in this context refers to impedance isolation doesn't it ?
>=20
> Not sure quite what you mean here - if you mean impedance
> matching then it could do that too (e.g. the DI box would), but a
> 1:1 transformer would just be for galvanic isolation purposes

Not wishing to start anything, but a transformer can still pass a fault
current. eg a 1:1 mains isolating transformer does have 240VAC on
the secondary but is not referenced to ground, so the number of
situations where there's risk of shock is reduced but not to zero. It's
no bad thing having an isolation transformer, don't get me wrong
--=20
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