Accession Number : AD0631197

Title :   AN ECONOMICAL TIME STANDARD FOR CALIBRATING CARDIOTACHOMETERS AND BIOLOGIC DATA RECORDINGS.

Descriptive Note : Rept. for 10 Aug-1 Dec 65,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Angelone,Alfonso

Report Date : FEB 1966

Pagination or Media Count : 17

Abstract : A single-stage pulse-frequency divider is reported which will divide 60 pulses/sec. by 60, yielding 1-second pulses with reliability from -40 to +80C. Division by 300, yielding pulses at 5-second intervals, is reliable from +5 to +45C. A triple-division circuit is then developed from the single-stage divider concepts. This circuit is incorporated into a calibration instrument which produces pulses in a frequency range useful for time calibration of biologic data. When the instrument is used as a cardiotachometer calibrator, pulses are available from 30 to 300 pulses/min.; as a time marker, periods range from 50 msec. to 10 sec. The circuitry remains stable over a line voltage fluctuation of plus or minus 20% and a temperature range of -15 to +80C. The output pulse, available as either a negative or positive going pulse, is 8.33 msec. wide, has an amplitude greater than 10 v., has rise and fall times of the order of 10 microsec., and exhibits a typical timing accuracy of plus or minus 0.02%. (Author)

Descriptors :   (*FREQUENCY DIVIDERS, PULSE COUNTERS), (*TIME, STANDARDS), (*CARDIOGRAPHY, CALIBRATION), PULSE GENERATORS, LOW FREQUENCY, TEMPERATURE

Subject Categories : Medical Facilities, Equipment and Supplies
      Electrical and Electronic Equipment
      Biomedical Instrumentation and Bioengineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE