At 17:58 04/11/96 -0800, peter cousens wrote:
>I fail to see the point of isolation transformers on test gear
> unless the filter caps have excessive leakage or its open
>'cause your fixing it or you're suffering from
>incontinence and sitting on it.
>
>In general, mains test equipment would already isolate the supply
>soon after entering the case, why do it twice?

Maybe getting both satisfied would be to cut earth after the filter caps
(i.e. let earth gound go only to the filter caps) - you get your equipment
floating, with a "real" isolation transformer (the built in).