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RE: B vs H/ Transformer analogies of Poynting Vector.

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 08:35 AM 4/26/2005, you wrote:
Original poster: "Ralph Zekelman" <gridleak@xxxxxxxxxxxxxx>


A little off the thread topic:

Does anyone have a schematic for an
arrangement that will show a B vs H curve on an oscilloscope?

Ralph Zekelman

Two windings on the core in question, one many turns, one just a few. Measure the current through the many turn coil with a series resistor That's related to the H (the magnetizing field).

Measure the resulting induction (B) with another coil on the core.

Here's an example:


Tektronix also makes a software widget for their scopes that directly displays the B-H curve.

Here's a EE lab exercise for measuring transformer characteristics... Look at figure 3