Oscilloscopes measure current and voltage and, through the magic of mathematics, calculate power. Unfortunately, power comes in a large number of guises: instantaneous, real, apparent, and reactive.

Measuring AC current (220-V mains RMS current) is not as simple as measuring DC current. In DC current measurement, you can simply hook the oscilloscope probe to the shunt resistor and calculate the ...

Some measurements, like “peak to peak amplitude” are pretty straightforward. But when should you use “mean” and when should you use “RMS”? What exactly is RMS, and what’s the difference between “RMS” ...