True-RMS meter

EE December 1986 40 TRUE RMS METER Determining the RMS value of a voltage or current hitherto required at least a scope, a textbook of basic electronics, a pocket calculator, and, at times, sheer guesswork regarding the interpretation of resultant figures. This plight has prompted us to design a wideband AF RMS meter featuring technical characteristics to make it suitable for a wide variety of measuring applications. Technical characteristics: ■ Input ranges: ■ Accuracy Min = 1/2 Umrax!): 20 mV; 0.2 V; 2 V; 20 V ( -40 dB; -20 dB; 0 dB; 20 dB). + 4 1 .5% 1 digit) 0-100 kHz; 4 5% 100-200 kHz. In electronics literature, both at the hobby and the professional level, the synonyms effective, virtual, and root- mean-square are frequently used to qualify an alternating quantity such as voltage or current. Also compo- nent ratings, maximum permissible dissipation, AF and RF signal levels, to name but a few examples, are fre- quently stated as being rms values. For relatively low-fr...