EDN

When do you need true rms?

Low-end meters measure an AC signal’s average voltage or current. That’s fine for measuring clean sine waves, but I’ve yet to see such a waveform except when produced by test equipment. With AC ...
EDN

Circuit measures true-rms and average value

The circuit in Figure 1 measures both the true-rms value and the rectified average value of an ac signal. This design uses two low-cost ICs in SOIC packages and consumes only 180 µA of quiescent ...
Electronic Design

True-rms Voltmeters Measure to 0V for Complex AC Voltages

Murata Power Solutions has introduced the DATEL DMS-20RM series of voltmeters that can measure the true-rms value of complex ac voltages and, with an input frequency range of 47 - 1kHz. It is ideal ...
Electronic Design

True RMS AC/DC Current Clamp Meter

Extech Instruments announces its MA640 600A True RMS AC/DC Clamp Meters + NCV that has a higher accuracy rating then standard RMS meters. To use a clamp meter, only one conductor is normally passed ...