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4.3
BIO Unit EZU-EK25
4.3.1
General and board description
Composition
PCB.
Outline of PCB : The PCB executes amplification and filter process of ECG signal,
4.3.2
BIO PCB circuit description
BIO PCB is divided into the following 14 blocks.
1.
Instrumentation Amp.
Amplifies the signals obtained from 3 ECG electrodes.
2.
Amplifier
Amplifies ECG signal.
3.
Volume control
Adjusts the ECG signal to an appropriate volume.
4.
Filter
Cuts high frequency with the filter.
5.
R-WAVE
The comparator to pick up R-wave from ECG signal.
6.
A/D converter
A/D converts the signal outputted from the analog part.
7.
Digital filter
Digital processing of a low path filter, a high path filter, a position variable, a
notch filter, etc. is carried out to the A/D converted data.
8.
R-Trig control
Outputs R-Trig signal corresponding to ECG ON/OFF.
9.
Clock generation circuit
Produces the reference clock (10msec) for Sync1, Sync2 and Heart rate
measurement.
10. Delay counter
Counts down the value given from the CPU and produces Sync1 and Sync2
signals.
11. Sync１/２ circuit
Makes the control signal when scanning the US signal with Sync mode and also
produces the control data for display of Sync mark on BIO waveform displayed on
the monitor.
: EZU-EK25 is an option of EUB-5500 and consists of the following
1.
BIO PCB
and controls for display on the monitor.
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L1E-EA0229
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