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HEWLETT-PACKARD
JOURNAL
TECHNICAL INFORMATION FROM THE -dp- LABORATORIES VOL. 1 No. 4
5HED ALTO, CALIFORNIA HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA DECEMBER, 1949
Design Notes on the Resistance-
Capacity Oscillator Circuit
(The that is the concluding portion of Mr. Bauer's article that was
begun in the November issue)
Part II
ACCURACY
OVERALL accuracy as applied to a factors affect the short-time stability;
variable-frequency oscillator is a others affect the long-time stability.
general term that includes many factors The accuracy specification of within
such as the inherent stability of the cir 2% that is usually given for resistance-
cuit, mechanical stability and resetabil- capacity oscillators is intended to in
ity of the tuning system, readability of clude the majority of these factors.
the tuning dial, care with which the dial Consequently, the actual accuracy is
was calibrated, effects of aging on the different for different combinations of
various component parts, and the effects conditions and is generally better than
of power supply variations and ambient this figure under normal operating
temperature changes. Some of these conditions.
JONG-TIME stability-the stability
over a period of several months
or more