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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