Let’s say I have an unknown output transformer that I want to know “the impedance” …
A transformer, through electromagnetic induction, “transfers” alternating electric energy from the primary to the secondary (AC current)
A load Z2 connected at the secondary is seen at the primary as an impedance Z1. This change in the impedance is the impedance ratio of the transformer.
If N1 is the number of turns in the primary and N2 the number of turns in the secondary, the ratio voltage presented to the primary / induced voltage in the secondary is as follows:
Following this schematic, if I measure V1 and V2, I can deduce the ratio :
My PT is 230V at primary, 36V RMS at the secondary.
At first, I test a known OT (5kΩ at the primary for 16Ω at the secondary) :
Now, let’s test my unknown OT (from a Vox Student) :
That gives :
Thanks to ProjetG5 team for great ideas, as always !