3. Using a two-channel oscilloscope, measure the peak-to-peak voltage VR across the resistor and the peak-to-peak voltage VL across the inductor. Measure the voltage across the inductor using the difference technique described in a previous experiment. Record the voltage readings in Table 2. VR VL I XL Table 2 Measured and Calculated Values (f = 25 kHz) ZT

A dual-trace oscilloscope has two separate input channels, one for each trace, with their own connections and controls. It can plot one or two signals concurrently. A separate channel is provided with each signal that a scope reads. Scopes with two to four channels are highly popular.