View Single Post
Old 24th Jan 2007, 7:29 pm   #4
ppppenguin
Retired Dormant Member
 
ppppenguin's Avatar
 
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
Default Testing a transformer for shorted turns

Quote:
Originally Posted by oldeurope View Post
The tester should be connected at the primary (230VAC) input only!
Agreed.

Quote:
Originally Posted by oldeurope View Post
Any ideas why there is a 47K resistor?
Presumably to avoid a high peak current through the neon. With a big transformer the stored energy in the transformer (0.5*L*I^2) might be enough to destroy the neon. I know that not all the energy will reach the neon because the voltage will quickly drop below the maintaining voltage of the neon but the total energy might still be destructive.

Last edited by Darren-UK; 9th Mar 2008 at 11:07 pm. Reason: Title continuity.
ppppenguin is offline