Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1975-10-28
1977-06-21
Queisser, Richard C.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
340347AD, G01K 724, H03K 1302
Patent
active
040303632
ABSTRACT:
An electronic thermometer providing an improved means for controlling temperature readout. The thermometer incorporates analog-to-digital conversion utilizing a pulse width modulation technique. The temperature of a patient is taken for a given time interval and the last reading thereof is held for another given time interval. An adjustable oscillator provides clock pulses to a frequency divider one output of which triggers a saw tooth generator and other outputs of which are coupled to a decoder driving the display. The saw tooth generator provides an input to a reference comparator and a temperature measurement comparator the former of which receives a reference voltage and the latter of which receives a temperature sensitive voltage derived from circuitry which includes a thermistor. The outputs from the comparators are coupled through a hold-release circuit utilized to prevent erroneous readings due to premature release of an off-on switch, with the output from the hold-release circuit being coupled to the counter-display decoder to control the number of pulses therefrom fed through drivers to the digital readout display. The patient's temperature is continually displayed for a given time interval.
REFERENCES:
patent: 3111662 (1963-11-01), Pierce
patent: 3217144 (1965-11-01), Hinnah
patent: 3274832 (1966-09-01), Hamilton
patent: 3477292 (1969-11-01), Thornton
patent: 3725784 (1973-04-01), Bayer
patent: 3729998 (1973-05-01), Mueller et al.
patent: 3766782 (1973-10-01), Shimomura
patent: 3768310 (1973-10-01), Krepak
Appleman John S.
Electromedics, Inc.
Polumbus Gary M.
Queisser Richard C.
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