Mediana P10 Manual de Serviço Página 103

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97
z ECG unit: measures electrocardiographic waveform data.
Protection
Circuirt
Patient
Cable
Input
Buffer
&
Filter
Lead off detector
Driven circuit
saturation detector
Lead off detector
Driven circuit
saturation detector
Lead off detector
Driven circuit
saturation detector
Lead off detector
saturation detector
Lead off detector
Driven circuit
saturation detector
RA
LA
LL
C
RL
Lead I
Instrument Amp.
Gain Amp.
Filter
Lead II , III
Instrument Amp.
Gain Amp .
Filter
Lead C
Instrument Amp.
Gain Amp .
Filter
Photo
coupler
.
Isolation
DC/ DC
DC + 5V
Isolation DC
+11Vdc ±1 Vdc
Lead
Selector
ADC
Photo
coupler
MCU
Main
Processor
Main
Processor
Figure 37. ECG Unit Block Diagram
z Respiration unit: measures respiration rate data.
Constant
Current
Source
Protection
Circuit
High
Pass
Filter
Rectifier
Band
Pass
Filter
ADC
Isolation
DC/DC
Photo
coupler
DC +5V
Isolation DC
+11Vdc ±1 Vdc
Patient
Connector
Patient Isolation
Main
Processor
Figure 38. Respiration Unit Block Diagram
z SpO
2
unit: measures oxygen saturation data.
Isolation DC/DC
Photocoupler
SpO
2
module
(ChipO2PM)
(Nell3)
Main
Processor
DC +5V
Isolation DC
+11Vdc ±1 Vdc
Patient Isolation
Patient
connector
Figure 39. SpO
2
Unit Block Diagram
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