My AT420E(OCC) Cartridge - a confused look at the electrical side

[hbtaudio]

Let's take a look at the well-known law of induction, turn ...

and remember what the coefficient of self-induction called inductance actually expresses and what it is directly dependent on. I think that puts modeling and, above all, absolutism back in perspective. In short, the coefficient L(tc) cannot be constant (in sampling mode as transducer_coil or our electrical tests).

The challenge now is to represent this coil (an N wire winding on a soft magnetic iron core) as a lumped model in such a way that it can correctly model a wide load spectrum.

 

[hbtaudio]

Yes, you need to measure with as small an excitation as you can; a cartridge has tiny coils and a core that is easily saturated. Fortunately, with constant voltage excitation, the impedance is enough to limit current.

Wouldn't it even be advantageous if the parameters were determined with a constant current flow? If so, then the next question is the absolute value of this current flow.
But I am patiently waiting for your measurement results on this academic but very exciting subject: measurement technology.

Many thanks in advance

HBt.

 

[EC8010]

OK, so we go back to hysteresis loops and note that inductance changes with flux density. But I think in a moving magnet cartridge, the flux density is pretty feeble, which is why I think one should test at as low a level as practicable. I think the changes in inductance we see in a cartridge are down to hysteresis loss goin g round the loop (rather than up and down it) and to eddy current effects. I await new tester impatiently. Naturally, tomorrow is a Bank Holiday.