Negative Inductance and measure of Magnetic force.

[sm0ky2]

@smOky2,

The choke reads normal rated inductance immediately after the magnets are removed.

Wrong


It measures outside of its rated tolerance.
Did you never question "why"?

[synchro1]

Wrong


It measures outside of its rated tolerance.
Did you never question "why"?

@smOky2,

The issue here is whether the inductance meter measures an "Inverse Henry" or not.

[sm0ky2]

@smOky2,

The issue here is whether the inductance meter measures an "Inverse Henry" or not.

If the meter is giving you a false reading it would explain both the negative value
it is showing you on a normal copper wire inductor


As well as the false reading on the choke.


I'm not arguing against the magnetic field reducing the inductance
This is an obvious effect.
But for it to go negative, means you are inducing a reverse current.
and I don't believe this to be the case with what you have shown.

[sm0ky2]

I say that because the DMM you use is a voltage-biased device
and it shouldn't even be able to induce a reverse current to give that
measurement, in an unpowered circuit.


The circuit I posted will help you.


Swapping the clip leads with ones you know have not been magnetized
may also clear things up

[synchro1]

I say that because the DMM you use is a voltage-biased device
and it shouldn't even be able to induce a reverse current to give that
measurement, in an unpowered circuit.


The circuit I posted will help you.

@smOky2,

The meter is not measuring a reverse current it's measuring the presence of magnetic energy.