. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. HARMONIC PRODUCTION IN MAGNETIC MATERIALS 777 DOTTED LIN : INDICATES laOOcv RESISTANCE x- y" y yy ^ 24 WITH SINGLE FREQUENCY INPUT y ^ y y- y y y 20 y y ^ ,/ y y ol6 •' ^ y EFFECTIVE RESISTANCE OF A GRA0E"b"|RON DUST COIL TO THE THIRD HARMONIC. AS A FUNCTION OF FUNDAMENTAL CURRENT F = 409 y- 8 X If MILS Fig. 45 The experimental method for obtaining this result—the impedance to a small third harmonic in the presence of a relatively large funda- mental—is
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. HARMONIC PRODUCTION IN MAGNETIC MATERIALS 777 DOTTED LIN : INDICATES laOOcv RESISTANCE x- y" y yy ^ 24 WITH SINGLE FREQUENCY INPUT y ^ y y- y y y 20 y y ^ ,/ y y ol6 •' ^ y EFFECTIVE RESISTANCE OF A GRA0E"b"|RON DUST COIL TO THE THIRD HARMONIC. AS A FUNCTION OF FUNDAMENTAL CURRENT F = 409 y- 8 X If MILS Fig. 45 The experimental method for obtaining this result—the impedance to a small third harmonic in the presence of a relatively large funda- mental—is illustrated in Fig. 5. The method consists in measuring the third harmonic current by means of a current analyzer ^^ for a number of circuit conditions in which the fundamental current is. TO CURRENT ANALYZER 'HIGH Z OUTSIDE BAND Fig. 5 maintained constant. The circuit is first tuned to the third harmonic by varying the capacity C in the third harmonic circuit, and the current is then measured for a series of values of the series resistance r. A shunt resonant circuit tuned to the fundamental is inserted in the third harmonic path so as to separate effectively the third harmonic circuit from that of the fundamental. With this precaution taken to avoid harmonic production in the analyzer and to maintain the funda- mental current constant while r and C are varied, the inductance to the third harmonic is obtained from the resonating capacity, and the resistance is determined as that value of r for which the third harmonic current falls to half its maximum. ^- For details of current analysis see the paper by A. G. Landeen, B. S. T. J., April Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
