Agilent 1964-01 free download

File name 1964-01.pdf

HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E h p - L A B O R A T O R I E S 5LISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA JANUARY, 1964 An RMS-Responding Voltmeter With High Crest Factor Rating IN TYPICAL electronics work, measurements of ac voltage are most often made with voltmeters that respond to the average value of the rectified voltage waveform or to the peak. In most cases such measurements are completely satisfactory, as confirmed by the popularity of such voltmeters. At the same time, however, there are occasions when a measurement based on the true rms value of a voltage is desired. Measurements of electrical or acoustic noise, of low-duty-cycle pulse trains, and of voltages of undetermined waveform are instances wherein an rms-responding voltmeter is valuable. A new voltmeter has now been developed that both responds to the rms value of the ac waveform and has a high crest factor rating. This rating is the measure of the voltmeter's ability to read the rms value of waveforms that have a high peak- to-rms ratio such as low-duty-cycle p