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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
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Vol. 5 No. 7-8
SLISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MAR. -APRIL, 1954
Frequency and Time Measurements
With the New -hp- High Speed Counter
A~iOUT three years ago -hp- introduced advantages of the counter led to require
the 10-megacycle frequency counter. ments to extend the measurement range to
This instrument was designed to simplify the higher and higher frequencies. Consequent
problem of making precision measurements ly, -hp- recently introduced a frequency con
of frequency. In place of conventional meas verter1 which enables measurements to be
urement set-ups involving frequency stand made with the counter to 100 megacycles.
ards, interpolation oscillators, mixers and As a result of further requirements for the
oscilloscopes, the 1 0-megacycle counter was counter, it has now been provided with sev
a single instrument that could by itself make eral companion instruments which permit
precision frequency measurements automat frequency measurements to be made to 220
ically. In operation the counter was so sim megacycles and which permit time interval
ple that with it non-technical personnel measurements to be made over a range from
could make measurements in a fraction of 1 microsecond to 107 seconds. In addition,
the time required for technical personnel to the counter itself has been mechanically re
make the same measurements with an array designed to simplify the use of these instru
of conventional equipment. ments.
Although the 10-megacycle range of the
counter includes the greater portion of ordi FREQUENCY MEASUREMENTS
nary frequency-measuring applications, the The new Model 524B counter is shown in
Figs. 1 and 2. By itself the instru
ment is capable of measuring fre
quencies as high as 1 0 megacycles
I
525B and as low as 0.01 cps. To oper
m-nt«c
FIE1UEK