GE Corometrics 170 Series

5-40 170 Series Monitor Revision C
2000947-004
Theory of Operation: FECG/IUP Board Theory of Operation
Figure 5-22. FECG/IUP Board Block Diagram
 FECG Low Noise
Differential
Amplifier with
Protection Circuitry
 RL Drive Circuitry
 High-Pass Filter
Pressure Differential
Amplifier with
Protection Circuitry
Model Line Optical
Isolation for FECG,
IUP, US1 (174 only)
and TOCO
 +4 V Reference
 IUP Detection
Circuitry
Isolated Power
Supply
Filtering
and Gain
Stages
 Gain and Offset
Adjustments
 Filtering Stages
RA
LA
RL
PRESS
+PRESS
4 V
FECGEN
IUPEN
TOCOEN
Isolated
Supplies
Optical
Isolation
Optical
Isolation
To TOCO Enable
+12 V (173); +11.6 V (174)
FECGEN
IUPEN
TOCOEN
To Main Board Front End
FECG/IUP Connector
To Main Board A/D
Converter for Processing
Isolated Side
Connector
Unisolated Side
Connector
144 KHz (173 only)
Power Supply
Control PAL
144 KHz
CLEAR*
Q, Q*
174 Only
US1EN (174 only)
US1EN (174 only)