Agilent 1962-09 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 - h p - L A B O R A T O R I E S Vol. 14, No. 1 PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA SEPTEMBER, 1962 A New Generation of High-Speed Frequency Counters A LITTLE over a decade ago the Hewlett- Figs. 3 and 4. One of the new counters measures J- A- Packard Company introduced what subse from 0 cps to 20 megacycles and the second quently proved to be one of the electronics from 0 cps to 50 megacycles. Using a plug-in, field's most important measuring instruments. each counter will measure to 500+ megacycles. This was the high-speed frequency counter, the Both counters have a large, in-line readout and now well-known -hp- Model 524*. This counter high input sensitivity. They are transistorized automatically measured frequencies up to 10 and use computer-type construction, giving a megacycles and did so with an accuracy superior small physical size with a panel height of only to that of any but the most elaborate methods 5 i". A full array of plug- ins has been designed of the time. During the ensuing decade, its all- to be compatible with this small panel size, as around capabilities brought this counter to the described later. Except for their different maxi stature of an instrument accepted by all as the mum counting rates of 20 and 50 Me, the two standard of the industry. counters have essentially the same electrical Advances in the art have now permitted the and mechanical characteristics and use the development of a new generation of two high *A. S. Bagley, "The High-Speed Frequency Counter