Hi Dave,Yes, I agree. The magnetic shunts are causing the non-linearity. As I mentioned a moment ago in my reply to Phil, the voltage ratio is non-linear because of this. Were trying to use the voltage ratio to determine turns ratio. This won't work "IF" the shunts have influence because it affects the voltage ratio. I think everyone measuring is seeing this affect.
The problem I have is the inductance factor is based on the turns ratio. So, how to remove shunt influence? The only way I can think of is to use "extreme" low voltages. Maybe instead of inserting 120Vac to the secondary, we need to bring down the voltage to something between 1 and 10V input to the secondary and measure the millivolts at the primary? There must be a point at which the shunts have little affect and the voltage ratio becomes linear enough for a decent approximation.
Take care, Bart sparktron01@xxxxxxxxxxx wrote:
Bart Is it possible that the inductance varying is hosing the apple cart? Instanteous voltage for an inductor (complete) is: V = iR + L (di/dt) + i (dL/dt) The last term in "linear" circuits tends to zero and (usually) has no bearing on circuit. But with a magnetically shunted circuit the third term starts influencing the second, and vice versa (i.e the whole circuit becomes VERY non-linear...) Regards Dave Sharpe, TCBOR/HEAS Chesterfield, VA. US
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