9
coupler.
4.1.3 Control unit
(
1
)
Principle of control unit
The control system consists of printing system, button system, liquid crystal display system,
and signal acquisition system. The ECG signal sent from the signal acquisition system through
the high-speed optoelectronic coupler is received by the CPU system, after digital filtering, gain
adjustment and motor drive, it is sent to the printing system to print the ECG waveform. After
the printing is completed, the CPU system processes waveform measurement and analysis. The
CPU system also receives an interrupt signal and button code from the button system to complete
the interrupt processing. In addition, the lead-off signal, paper out detection, battery voltage
management, and automatic power-off are also managed by the CPU system. The liquid crystal
controller receives data and commands from the CPU system to complete the display of the
control state of the device.
(
2
)
Principle block diagram is shown in Figure4-2.
Figure 4-2 Block diagram of control unit
4.2 Name of each part and its function
4.2.1 Front view
Figure 4-3 Front view
Cont r ol syst em
Si gnal acqui si t i on
syst em
Di spl ay syst em
But t on syst em
Pr i nt i ng syst em
Power modul e
1
2
3
Summary of Contents for 1200G ECG
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