Ken Johnson from Teledyne LeCroy recorded a short video with us recently on an eight-channel Teledyne LeCroy scope which was being demoed displaying power signals from a little demo board. The scope was the LeCroy eight-channel, 12-bit, one-gigahertz oscilloscope. In the demo, it displayed five power rails and a current signal and a digital clock that represents the switching period for the dc-dc converters.
Though it is possible to see these signals on any other scope, the 12 bits of digitization available on the LeCroy scope provides a lot more detail. The scope in the demo ran a program called Digital Power Management. Johnson ran the program through its paces, assigning and naming channels. The program allows displaying measured data as a numeric table that includes computed values recalculated once per switching period of the clock.
The operator can see how recorded values change over time just by touching on that value on the display screen to see a per-cycle value. These features come in handy for seeing a load response or transient response.