Quote:
Originally Posted by Tubejunke
Ok; the problem with assumptions right? Anyway, I have a Variac. I assumed it was isolation simply due to its heavy weight which told me that there was a transformer present and I thought that an isolation transformer was a 1 to 1 ratio transformer used to simply isolate the user of equipment plugged into the unit from direct contact with line voltage/current.
Correct me on this one.
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Both an autotransformer (secondary connected to primary and not isolated) and an isolation transformer (secondary not connected to primary) have iron and magnetic coupling. So, heaviness is no indication one way or the other.
If you connect an ohmmeter from primary to secondary, an isolation transformer will show infinite ohms. An auto transformer will show conduction indicating a connection.