If there is no turns ratio tester, only test the bridge. Make a simple fixture to short-circuit the primary tail end with the secondary head end.

Then it is necessary to test the inductance from the primary end to the secondary end. Inductance of qualified products will increase and inductance of unqualified products will decrease.

According to the electrical schematic diagram, the parameters designed on a comprehensive computer such as 3250 can be detected. There are many instruments on the market. For instruments such as bridges or inductors, connecting terminals of the same name with tinned wires is also called incoming terminals. If the inductance is greater than that of the primary winding with the largest number of turns, it is in phase. Conversely, if the inductance is less than that of the winding with the largest number of turns, the phase is reversed, that is, the winding is reversed.

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If everyone helps, I hope the answer to this case!