Thanks for your Reply . Actually I was testing this item . I was checking continuity between pins...Such when Pin 1 with -ve end and pin 4 with +ve end of multimeter I got some value but after swiping +ve and -ve end , the value was 1.First, welcome to AAC.
Now, are we talking about a Bridge Rectifier?
A diode is checked on the multimeter using the "Diode Check" setting. When reading one way through the diode it should typically read somewhere around 0.450 and should have NO reading when reversed. If it tests out that way then it's good. But if it reads in both directions then there's a problem. If it reads close to zero then it's shorted.
But that did not happen in case of other combinations.When measuring across the AC inputs to a bridge, you will get and open ("1" on your meter) in both directions. That is normal.
Look at a bridge rectifier circuit and the reason will become clear.But that did not happen in case of other combinations.