Agilent 1958-08 free download

File name 1958-08.pdf

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. 9, No. 12 UBLISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA AUGUST, 1958 An Automatic DC To X-Band Power Meter For The Medium Power Range HO measure high-frequency power in the Such a direct approach is achieved by a range above the low milliwatt region new power meter that automatically mea where direct bolometric methods reach a sures average power in the range from 10 limit, it has been usual practice to retain the milliwatts to 10 watts. The instrument is basic bolometric method but to reduce the useful to at least 12 kilomegacycles and is power actually measured by a known also capable of use down to dc if desired. amount with attenuators and directional It can be used to measure any of the com couplers. Although this approach provides mon forms of power such as ordinary ampli useful information, a direct method is funda tude-modulated, pulsed ac, pulsed video, mentally more desirable, since it would and dc. In distinction to methods where the avoid the inconvenience of cascading several rf load is built into a special external mount, components into a measuring setup and the new instrument contains an internal 50- would also avoid the errors that additional ohm load which acts as the rf termination components introduce into the measure and is provided with a type N coaxial con ment. nector on the panel. itm TEMPERATURE )