Agilent 1963-08 free download

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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 Vol. 14, No. 12 PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA AUGUST, 1963 A Wide-Range RC Oscillator with Push-Button Frequency Selection IN BOTH laboratory and production work lator tuning system to have high resetability it is common to encounter measuring situa and simplified frequency selection is to design tions in which it is necessary to make tests at one in which the desired frequencies are se a relatively few test frequencies, but in which lected by push-button switches. Such a system these same few frequencies are used again and gives quick selection of frequency, eliminates again. When the need for operator dexterity in setting a sec ALSO this is the case, tuning dial, and all but eliminates the effect An Oscillator for Telephone Tests, p. 6 it is advanta of mechanical tolerances which degrade the A O.I Nanosecond Pulser, p. 7 At Wescon, p. 8 geous if the resetability of the usual variable tuning sys test oscillator tem. Consequently, the repeatability of a push being used has not only a convenient means button system can be essentially that estab for selecting the desired spot frequencies but lished by the short- and long-term stability of also a high resetability of output frequency. the oscillator circuit, while the readability, A logical approach in designing an oscil being that of a digital system, is high and at