The no-load loss of transformer core is based on a certain magnetic density, so you have to determine this value first. After the iron core is fixed, its effective cross section is also fixed, which is the parameter of one turn voltage related to the winding. So it doesn't matter how many turns the temporary winding makes. The key point is that the turn voltage obtained by adding voltage/turns during the test is equal to the turn voltage you designed. Of course, as close as possible to the design turn, the misunderstanding will be smaller. In the factory, we usually get some small tooling such as plug-ins, which can quickly obtain the rated turns (for example, the plug-in is 17 turns, 33 turns can be rolled twice, and the tail line is reversed), and then the rated voltage is added, so that the no-load loss can be measured conveniently.

If there are too many turns, you can use half rated turns plus half rated voltage. One-third turn plus one-third rated voltage. . . .

I said so much, do you understand? Ha ha laugh