using an ohmmeter

[gjoo]

In the book i was reading it said, "use an ohmmeter for testing for open and shorted (internally and externally) field coils." I dont understand what they mean by internally or externally.

 

[poor mystic]

"Internal" means that sometimes 2 or more internal turns of a coil (say a motor magnet coil or a transformer coil) can become fused together.
An "external" short is one where the short circuit is in the wiring to and from the coil.
Both kinds of short circuits cause faults.

 

[gjoo]

How can you check with an ohmmeter if its an external fault?

 

[gjoo]

I get it now, thankd