Agilent 1951-03 free download

File name 1951-03.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. 2. No. 7-8 'UBLISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MARCH-APRIL, 1951 Power Measurements from 10 to 12,400 Megacycles A F HIGH frequencies, instruments for set-up for signal generator standardization is measuring power have wide usefulness. shown in Figure 1 . The signal generator is This usefulness is based on the fact that meas connected through a length of coaxial cable urements of h-f power can be made with to a bolometer mount where the output good accuracy and have more significance power from the generator is absorbed. With than measurements of h-f voltage or current. present-day signal generators that have a To provide more complete coverage in the source impedance reasonably well matched -hp- line of power-measuring equipment, a to the line impedance, this measurement can number of new devices have been added to be made on the basis of maximum available the basic group of power-measuring instru power with an untuned bolometer mount. If ments described in the May, 1950 issue1. The the source impedance is unknown and a complete line now includes power-measur measurement of maximum available power ing equipment for use over the range from 10 is desired, a stub tuner can be used to trans to 12,400 me. form the load impedance to the conjugate of Power measurements have many practical the generator impedance. If the measure h-f applications. For example, in the labora ment is desired in terms of a "flat" load, a tory it is often necessary to standardize the slotted section can be inserted into the trans output