Check the power transformer with a multimeter
A? Check whether there is any obvious abnormality by observing the appearance of the transformer. Such as whether the coil lead is broken, desoldered, whether the insulating material has scorch marks, whether the iron core tightening screw is loose, whether the silicon steel sheet is rusted, whether the winding coil is exposed, etc.
B? Insulation test. Use the multimeter R×10k block to measure the resistance values between the core and the primary, the primary and each secondary, the core and each secondary, the electrostatic shielding layer and the secondary, and the secondary windings. The pointer of the multimeter should point to infinity. verb: move. Otherwise, the transformer insulation performance is poor.
