Murata today announced the DMR20-1-ACV “nanometer” self-powered four-digit bright LED voltmeter. This line powered AC voltmeter can measure the true RMS value of its input from 85 to 264 VAC to within ...
The RMS value of a time dependent voltage or current is based on the simple concept of equality of power dissipation; however, its theoretical calculation or instrument implementation may not be easy.