Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1963-08

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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




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