Agilent 1953-07 free download

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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 VOL. 4 No. 11-12 UBLISHED 1953 THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA JULY-AUGUST, 1953 Measurements to 100 Megacycles with the -hp- Frequency Counter ' I "* HE -hp- Model 5 24 A Frequency Counter method has generated a wide demand to ex J- has substantially simplified measure tend the method to much higher frequencies. ments of frequency wherever it has been used. Thus far, this has not seemed practical in To measure frequencies up to 10 megacycles commercial instruments although under with the 524 A, it is only necessary to con laboratory conditions counters can be made nect the unknown frequency to the counter. to operate considerably above 1 0 megacycles. The counter does the rest, displaying the It is practical, however, to provide a sim measured frequency quickly and accurately ple, straightforward heterodyne device to on a direct-reading digital system. The coun enable the counter to be used with frequen ter is in wide use in laboratory and produc cies as high as 1 00 megacycles. Such a device tion frequency measurement applications in which non-technical personnel easily make is the -hp- Model 5 1 2 A Frequency Converter precision frequency measurements that for shown in Fig. 1. This converter subtracts an merly required skilled personnel using a integral multiple of 1 0 megacycles from the combination of several instruments. frequency to be measured and provides the The 524A circuits directly count frequen remainder at its output terminal to be meas cies as high as 10 megacycles, the highest fre