Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1961-09

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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       - d p -   L A B O R A T O R I E S



JLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA                                                                                        SEPT. -OCT., 1961



                                           A New SWR Meter
                                         with High Gain-Stability
     ONE of the important instruments in the micro                                      heretofore but also increase the suitability of this
            wave measurement area is basically an audio                                 type of instrument for rf attenuation measurements.
     frequency instrument known as a Standing Wave                                      The new instrument is tunable over a 5% range so
     Indicator or SWR Meter. This instrument is essen                                   as to accommodate the tolerances and drift that are
     tially a very high gain (» 100 db) audio amplifier                                often encountered in modulating frequency. At the
     which is tuned to achieve high selectivity and which                               same time it has a selectivity that is variable from 15
     has an output meter calibrated for standing-wave                                   to 100 cps to meet a variety of measurement condi
     work. Although the instrument was originally in                                    tions varying from highest discrimination against
     tended for use with a slotted line section to measure                              noise to fast amplitude response for swept-frequency
     vswr, it has seen increasing importance in micro                                   measurements.
     wave attenuation measurements using audio substi                                      For attenuation-measuring situations, the instru
     tution techniques. It is calibrated for and normally                               ment is further designed to give high and constant
     used with a square-law rf detector, but its high sensi                             resolution over its complete measurement range. This
     tivity and single acceptance frequency also make it                                is achieved by arranging for each 2.5-db section of
     valuable as a detector for audio frequency bridges.                                the normal 10 db meter scale to be expanded to oc
        A new SWR Meter has now been designed which                                     cupy a full meter scale length and one that is roughly
     incorporates advances that not only make vswr meas                                 linear for high readability. The arrangement is such
     urements easier and more accurate to perform than                                  that 31.5 db of attenuation can be measured with as




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