On Thursday, 8 November 2018 02:20:42 UTC, Phil Allison wrote:
three_jeeps wrote:



Isolation transformer are used a lot in servicing certain type of
electronic equipment (e.g. tube TVs, amplifier, radio transmitters, etc..).


** But only those examples where the items have no AC supply isolation transformers - IOW they are *HOT CHASSIS* designs. All of them very old and very obsolete.

Well, they were standard & widespread in the 1990s.

Contemporary use of 1:1 isolation transformers would be for servicing devices like SMPSs.


It removes the direct path to ground of the electrical power,
significantly reducing the chance of death.

** That is wrong.

Using an isolation transformer allows one to connect the common rail ( or any other point) of an off-line SMPS to safety ground. After which you can use a scope in the normal way to investigate various waveforms, maybe small ones like MOSFET drive signals.

One can, but they are also used to reduce shock risk.


NT