info91 0‐ 08.itd
a)PreSSure Sensor
Elasuc capSule Capsule is inflated by pressure.
Parallel Plate variable capacitor;
Gap of parallel plate are changed by inflation.
CR oscillator;
Oscillation frequency are changed by capacitance change
Frequency Counter;
Frequency are counted by counter and digital outputis took
in to the computer
(The COunter is included in to the computer IC chip)
b)omers
Power supply control circuit;
Receives the control signal from the lnicrocomputer to turl■ the
power on and offto units other than the rnicrocomputer.
Displaり Unit;
Displays cuff pressure,maxilnuΠ l blood pressure,mllnum
blood pressure,pulse rate and inforllnation messages.
Electromagnetlc deflation control valve(ECV)d Ve circuit;
ECV d ve circuit controls the alr exl■ aust speed regularly
dung blood pressure rneasuring by the controlling signal from
tlle llnicrocomputer.
It exhausts the alr rapid after■le measuring or when‖ Err"
indicating.
Pump dve cicuit;
Controls staring and stopping ofthe pump.
C)MiCrOcOmputer
According to■ e informatlon received,the lnicrocomputer
controls the P/F converter,blood pressure rneasuring sequence
and LCD display drive.
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