How can a multimeter measure the quality of a transformer on a circuit board?
Primary resistance is usually in the tens to hundreds of Europe, the smaller the power, the greater the resistance measured. 181 ohm, normal, estimated to be 4~5W transformer. The secondary resistance is much smaller. It should be in a few euro to 0. euro.
All the primary and secondary windings are not broken. Generally small power step-down transformer, primary coil fine and many, and therefore easy to break, secondary is coarse and less, rarely will break.
There is no short circuit between the primary coil and the secondary coil and no leakage. Using a multimeter to high resistance, two probes are respectively connected with the primary coil and the secondary coil of each one should be more than the number of threads, indicating megohm, infinite.
