Another common measurement for LDOs is to measure the input and output current using a current probe. Measuring current can be difficult to do with a current probe because the current probe requires that the current path is run through the probe. To accomplish this, sometimes a wire needs to be run out to create a loop around which the current probe can be connected, which introduces parasitic inductance. Any amount of parasitic inductance affects the shape of transient waveforms, and enough parasitic inductance can cause large resonant voltage spikes that distort the real behavior of the device. Load transient measurements were taken using the TPS793 device with a current probe which displays the output current on Channel 4 (green) in Figure 3-11. This load transient was collected with long cabling, which introduces significant parasitics. The additional parasitic inductance caused large resonant voltage spikes on the output of the device. Figure 3-12 shows a load transient measurement that includes significantly less cabling and minimal inductance, which leads to more accurate measurement data. Figure 3-12 shows the true device response to the load step, while Figure 3-11 does not.