Connect the hot side of an AC power cord to the Line In to the W-11

Connect the neutral side to a light bulb, lamp, etc.

Connect the Line Out of the WC-11 to the other side of the light bulb. Use a jumper wire.

Connect the oscilloscope leads to the hot and neutral sides of the light bulb.

Be sure that all the wiring is secure so that nothing shorts out during the testing.

Plug in the AC plug to a 110 volt outlet