Average-responding AC voltmeters produce accurate readings only when measuring ideal sine-wave voltages. When these voltmeters measure distorted or irregularly shaped voltages, as shown in this slide, reading errors can exceed 20% of their full scale input. Until now, Murata AC voltmeters were 2-wire, average-responding AC voltmeters. In addition to not being able to accurately display complex AC signals, 2-wire meters, by design, cannot measure signals down to zero volts since these meters draw all of their operating power directly from the signal being measured.

