Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1961-06

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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
                                                                                                                                                                                            12 No. 10

IBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA                                                                                                     JUNE, 1961



                                   A Microwave Power Meter with
                              a Hundredfold Reduction of Thermal Drift
      A>asic limitation in bolometer type power                                           stable at this low level than previous meters
           meters has been the drift that thermal                                         were at higher levels.
      changes cause in the power meter zero reading.                                         The new power meter measures down to 10
                                                                                          microwatts full scale on its lowest range and
      Such drift not only sets a practical limit to
                                                                                          up to 10 milliwatts full scale on its highest
      the lowest power levels that the meter can                                          range. Its frequency coverage is determined by
      measure but has often constituted a consider                                        accessory bolometer mounts which have been
                            able inconvenience at                                         designed both in waveguide and in coaxial ver
                            higher levels as well.                                        sions. For waveguide use, a series of mounts
                               A new microwave                                            has been designed for guide sizes between 2.6
      power meter has been developed which has                                            and 40 gc (kmc). For coaxial systems, a single
                                                                                          mount operates over the full range from 10 me
      only about a hundredth of the thermal drift
                                                                                          to 10 gc.
      susceptibility of uncompensated power meters.                                          The new power meter further includes an
      This has permitted the new meter to have a                                          important feature for power-measuring equip
      10 times increase in sensitivity and to be more                                     ment. This is an output for operating an ex-




                                                                                                                                                           

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