How to test this transformer? It is a Laptop charger transformer. It has two legs on one side and four legs the other side. I want to test this transformer by giving 240V input and check the output on the other end. So my question is which side is the input and which is the output? What would be the output voltage? How to test it using digital multimeter?

http://imageshack.us/a/img706/5035/photo0326p.jpg
http://imageshack.us/a/img845/5672/photo0327x.jpg

Please Help.

 

Not a chance. The photos are horribly fuzzy, but that doesn't matter. That transformer is from a fast switching power supply. If you connect 240V to it, it will smoke instantly. The fact that you don't already know this, combined with the fact that it is rather difficult to measure one of those, even if you're good at it and have the right equipment, means you are not going to put it to good use.

 

Wow. Don't do it, Sunny! O Good advice from #12.

 

What does the scouter say about the fuzzy levels?

 

I would say its a centre tapped output, looking at the second picture there is an extra long wire this will be connected to 2 of the four terminals, so you can test it on Ohms with your Dvm, that should give you a start,

but its designed to be pulsed at high frequency around 80-100Khz, not 50 Hz.