Mindray DPM 1 Manual de Serviço descarregar pdf (Página 20)

Circuit Principle

Pulse oximeter Service Manual 2-8

2.3 EMC Design

The following protections are used for EMC design in DPM1:

1. Every IC has one by-pass capacitor, some ICs have different rating capacitors to

enlarge the filter band;

2. Serial resistors on the communication lines connected with the PC, to reduce the

interference propagation;

3. RC low pass filter on most low frequency signals, to reduce high frequency

interference;

4. One ground plane, no discrimination between digital ground and analog ground;

5. Match resistor used on important signals, e.g. read/write, chip select etc., to

prevent oscillating or overshoot

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Mindray DPM 1 Manual de Serviço Página 20