As you see, because of the saturation the knee is shifted. The
first part of the curve is distorted because of the current
necessary to de-magnetize the core: the sharp increase of the
voltage is when the material has been de-magnetized.
If you return to the former screen, it displays the computed V and
I values for the knee point.
Select SAVE on the menu; then, slowly reduce the voltage: the
test can be stopped only after knob (6) is in its zero position. This
is because the transformer under test cannot be left with some
remaining magnetization. So, if the test is broken during the
generation, and the output has not been adjusted to zero prior to
stop, the following message is displayed.
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