Measuring Current on Secondary winding

Thread Starter


Joined Jan 13, 2018
I’d like to do some hands on testing to look at how efficiently energy is coupled between very low power isolated transformers. I expected the current in the secondary winding will be somewhere in the low uA range and possibly up to ~10mA.

I’d like to look at moving the windings further apart, what signals produce the most efficient transmission of power, etc. I can power the primary winding with a signal generator and measure the voltage on the secondary winding with a voltmeter, but I’m not sure how to approach measuring the current produced in the secondary winding. Should I put a resistor across each end of the secondary windings and look at the voltage across it to determine the current or just measure the current with the voltmeter and essentially short both ends of the secondary winding with the voltmeter when I’m reading the current?

Something like this: