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Saturday, December 28, 2013

Transformer Measurement



Transformer Measurement

Transformer measurement is very similar to inductor measurement but with additional parameters to measure due to the secondary winding being present. Below is a representation of a transformer with all the parameters involved in the measurement.

  • L1 = Primary Inductance
  • L2 = Secondary Inductance
  • C1, C2 = Distributed capacitance of windings
  • R1, R2 = DC resistance of windings
  • C = Inter-winding capacitance
  • M = Mutual inductance

L1 and L2 can be measured directly using LCR. When measuring L1, L2 should be left open, and vice versa. Leakage inductance (self-inductance due to <100% coupling of transformer windings) can be measured with L2 is shorted.

C can be measured by measuring capacitance of 1 point of input at primary winding and 1 point of input at secondary winding (of same phase).
Turns ration (N) can be measured by connecting a resistor to the secondary. From the impedance measured from the primary, one can deduce the turns ratio with this formula:
Z = N2R
N = sqrt (Z/R)

That’s about it for basic transformer measurement.

J&K Audio Design
29/12/2013


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