Siemens SC 7000 - Figure 2-16 HEMO 2;4 POD Functional Block Diagram; Figure 2-17 IBP Functional Block Diagram; 12.2.1 Temperature

SC 7000 and SC 9000XL Patient Monitors Service Manual
ASK-T898-03-7600 Siemens Medical Systems, EM-PCS Danvers 31
7k9kXLTM.c2.CD_ROM.fm/04-99/kaupp
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Figure 2-16 HEMO 2/4 POD Functional Block Diagram
Figure 2-17 IBP Functional Block Diagram
Next, the signals enter a functional block that converts the differential
signals into single ended signals which are then presented one at a time in
a time-multiplexed fashion to a fixed gain single ended amplifier.
Calibration voltages for zero and 200 mmHg are periodically switched into
the amplifier input to correct errors in amplifier offset and gain respectively.
An A/D converter samples the resulting output voltage. Timing is
coordinated by the logic gate array.
12.2.1 Temperature Each of two thermistors is connected to a functional block that consists of
a precision resistor network to partially linearize the voltage verses
temperature transfer curve of the thermistor. This functional block also
consists of means for filtering RF noise and limiting the voltage swing. A 4.5
Volt reference is connected to power each linearization network.
WEDGE
PROTECTED
WRITE
GROUND
BUTTONS
PUSH
CO START
ZERO
DATA
CLOCK
EEPROM
MUX
FILTER AND
CLAMP
INJECTATE TEMP
T
A
T
T
TCA1TCA0
+
+
OFFSET
A
MUX
TA1TA0
PRESSURE SENSORS
REFERENCE
VOLTAGE
MANCHESTER
DATA OUT
CALIBRATION CONSTANTS
ZEROL
S4L
S3L
S2L
S1L
I4L
I3L
I2L
I1L
PA1
PA0
-5V OUTPUT
+5V OUTPUT
CAPACITOR
TECHNIQUE)
(USING FLYING
CURRENT LIMITED
VOLTAGE
REFERENCE
P
P
P
P
A
A
A
A
CLAMP AND
FILTERING
NETWORKS
DIFFERENTIAL TO
SINGLE-ENDED
CONVERTER AND
4 TO 1 MULTIPLEXER
A
FIXED GAIN OF 311
MUX
200 mmHg
0 mmHg
A
D
4 VOLTS
SWITCH TIMING BUS
16 BIT
SWITCHING POWER
SUPPLY
A
+12V INPUT
200KHZ SYNC SIGNAL
NON-ISOLATED
LOGIC GATE ARRAY
4PRESS
DATA AND CONTROL
MANCHESTER
DATA IN
DATA TRANSMITTER
DATA RECEIVER
-5V MONITOR
+5V MONITOR
A
MUX
CAL POINTS
T10
T37
T2
T1
LINEARIZE
T
A
FIXED GAIN OF 2
TEMPERATURE SENSORS
FIXED GAIN OF 10
A
FIXED GAIN OF 20
OFFSET
+
+
A
O.7R
BLOOD TEMP
LCD
LCD
CONTROLLER
EEPROM
R/W
+4.0 VOLTS
R_EDWARDS
R?
21
2
1
2
1
21
200mmHGL
4PRESSL