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 = N2RN = sqrt (Z/R)
That’s about it for basic transformer measurement.
J&K Audio Design
29/12/2013
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