The Romer-Lewin ring with inductors (part 5 preview) - Current measure and burden voltage

I tried to measure the current in the ring but it was not as easy as I first thought. The internal resistance of the multimeter in ammeter mode can be too high in a circuit like this, with an EMF of 100 mV and a total impedance of about 10 ohms.
When in the mA range, the UT 61E shows a resistance as high as 10 ohms that changes the circuit and alters the measurement. Instead of 9-10 mA (rms), we get a measurement of 6.3 mA (rms).
In the fifth part of this neverending series of videos I will show how the burden voltage changes with the ammeter's range, and hopefully how to obtain a reasonably accurate measure.