Mindray VS-800, Service Manual

Page: 22 / 74

Principles of Operation
2-10
2.2.4.3.3 A/D
The A/D conversion part converts the analog signal to the digital signal, and then sends it to
CPU for further processing.
2.2.4.3.4 D/A
The D/A conversion part converts the digital signal received from CPU to the analog signal,
and provides the control signal for the Led Drive Circuit and SPO2 Signal Process Network.
2.2.4.3.5 CPU System
Implementing the logical control of all the circuits;
Implementing the data processing for the SpO
2
parameter;
Implementing the communication with the main board.
2.2.4.3.6 Power & Signal isolate Circuit
Isolating the external circuits to ensure the safety of human body;
Supplying power for all circuits;
Implementing the isolation communication between the CPU System and the main
board.
2.2.5 NIBP Module
2.2.5.1 General
This module provides the function of measuring the Non-Invasive Blood Pressure (NIBP).
2.2.5.2 Principle diagram
Figure 8 Operation principle of the NIBP module Principle