How to check if a household step down transformer is working or not?

Question

How to check if a household step down transformer is working or not?

Answer 1

give ac input to the input side of the transformer and check its output using a multimeter in AC mode. check the output at that side of the transformer which is labeled 12-0-12V or 0-6V, etc. give the input ac to the other side pair.

if you get reading = 1.414 * labeled value, then ur transformer is workin fine.