Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1950-05

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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




BUSHED CALIFORNIA THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA




                       Direct Reading UHF Power
                              Measurements
         A T HIGH frequencies as at low the power                                          In use, the instrument operates as easily and
       -/^-flowing in a system is a frequently-                                            quickly as a vacuum-tube voltmeter.
       sought factor. In fact, at high frequencies                                            The high-frequency power to be measured
       power assumes extreme significance, for nei                                         is absorbed in a bolometer element. Since
       ther voltage nor current as such can be read                                        such elements customarily have an imped
       ily measured.                                                                       ance of 200 ohms and are operated with 50-
          Figure 1 shows a direct-reading high-fre                                         ohm transmission systems, an intermediate
       quency power meter that measures the out                                            device is required to transform the bolo
       put power from signal generators, oscillators,                                      meter impedance down to the line imped
       and similar equipment. In effect, this power                                        ance so that maximum power transfer can
       meter is an automatic version of the common                                         occur. Such a device is the tunable bolometer
       bolometer substitution bridge; but, because                                         mount shown in Figure 2.
       its operation is automatic, measurements can                                           The frequency at which high-frequency
       be made quickly

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