Simplified Circuit. A transformer has its primary connected to a source of AC that is indicated as adjustable from zero to 120 volts. One side of the secondary is connected to the positive output of a DC power supply that has a built in current meter. The negative side of the power supply is connected to one end of a 1 ohm resistor. The other end of the 1 ohm resistor is connected to one end of the choke under test. The other end of the filter choke under test is connected to the other side of the previously mentioned transformer secondary. So we have a series circuit consisting of the transformer secondary, a DC power supply, a 1 ohm resistor, and the filter choke under test. There are two voltmeters in the circuit. They will not respond to DC but only to AC. One is in parallel with the 1 ohm resistor and the other is in parallel with the filter choke under test. End of verbal description.