Coil concentric problem.

[dgm]

Good morning to the whole forum, I have a problem in doing the nulling of a IDX concentric coil, I state that I have always used a digital multimeter connected to the receiving coil, and then removing coils to the winding in reverse I can make an acceptable nulling. My question, on the multimeter, I read a fixed voltage of 12 volts in ac, but removing coils to the contrary winding does not change anything. Why, where am I wrong? Thank you for your kind help.

[dgm]

Good evening, can't anyone help me figure out what the problem is? Thank you.

[Koala]

this worked for me


https://www.geotech1.com/forums/show...idx+concentric

although I did use a scope to null

[dgm]

Thank you Koala for your answer.