Service Manual SC 7000 and SC 9000XL Patient Monitors
28 Siemens Medical Systems, EM-PCS, Danvers ASK-T898-03-7600
NOT A CONTROLLED DOCUMENT
7k9kXLTM.c2.CD_ROM.fm/04-99/kaupp
• Neonatal mode switching of pump and overpressure
• Safety logic
9.7 Non-volatile memory
A EEPROM stores pneumatic component flow factors. During calibration at
production system test and in the field, a 0.5 liter canister is connected to
the NBP input on the monitor. The monitor automatically measures the
pump and valve flow rates and determines their flow factors for the use in
the flow control algorithm.
9.8 Hose detection
An electromagnetic coil located at the hose connector detects the metal in
the hose connector when the connector is present.
9.9 Watchdog Timer
A watchdog timer is implemented in the power conversion FPGA to monitor
the safety timer clock input from the main FPGA in case the main FPGA or
its crystal become damaged.
Figure 2-14 HemoMed Front End
10HemoMed Front End
10.1Introduction
Refer to Figure 2-14. The HemoMed front end section of the monitor’s main
board takes invasive blood pressure, and thermal dilution cardiac output
data gathered by the HemoMed Pod from transducers at the patient and
converts them to digital form for transmission through isolators to the
computer section of the main board. The HemoMed front end may also be
used with a single or dual pressure cable instead of using the HemoMed.
10.2Pressure
The pressure data acquisition front end is designed to operate with resistive
strain gage pressure transducers having an output impedance of less than
3000 Ohms and an input impedance between 3000 and 200 Ohms.
Excitation voltage is applied in pairs. Press 1 and 3 share a driver as well
as Press 2 and 4. The output signals generated from the pressure sensors
are passed through filter and clamp networks which limit and filter RF noise.
The pressure excitations are monitored for fault detection.
Clamp and
Filter
M
U
X
16 Bit
A / D
Converter
Linearization
Pressure
4
Temperature
3
Pressure
Excitation
HemoMed
Press
Transducers
Cardiac
Asic
Control
Power
Pod
(Inj. blood, .7R)
Reference
Temperature
Power Monitor
Keypad
4
2
Keypad
Sense Excitation
2
Output
Data Control
Com
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