GE B30 Technical Reference Manual page 54

B30 Patient Monitor
DIRECT ECG (PWM)
Figure 24
Signals and isolation barrier
The communication signals transfer over the isolation barrier by using high isolation voltage
(6kV) opto isolators.
Power supply section
The power for the electronics on the floating part of the STP and the ECG boards is made on
each board with the switching power supplies connected to a high voltage isolated
transformer. The switching power supplies on the STP and ECG boards are synchronized to the
frequency, about 340kHz of the switching power supply on the NIBP board. The NIBP board
supplies non-isolated 5 V to the ECG and STP boards. The module uses only Vmod 13.8 - 16 V
voltage of the frame. The other voltages of the measuring boards are made by the switching
power supplies and regulators or the linear regulators. Each measuring board is protected
against overloading with PTC type automatic fuses.
1-40
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Document no 2044677-001
NIBP BOARD
RECEIVE DATA
RS 485
DRIVER
SEND DATA
SEND/RECEIVE
STP BOARD
RECEIVE DATA
SEND DATA
SEND/RECEIVE
ECG BOARD
RECEIVE DATA
SEND DATA
SEND/RECEIVE
Serial communication of E-PSM(P)W module
DATA
NDATA
DATA
RS 485
DRIVER
NDATA
DATA
RS 485
DRIVER
NDATA
+5 V
+5 V