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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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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.