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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>



All,

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?

Thanks.
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:

http://www.walkerldjscientific.com/Products/Product_Lines/Magnetic_Analysis/Hysteresisgraphs/BH-Curve.pdf

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
http://www.coe.uncc.edu/~elsheppa/2156/7-Transformer.pdf