Service manual

4. BOARD/UNIT DESCRIPTION
Service Manual BSM-4100 4.11
The ECG RESP3 board has the high-pass filter (for the selected lead ECG analog
signal at the amplifier final stage), low-pass filter (for the selected lead ECG analog
signal at the amplifier final stage) and A to D converter (for 12 lead ECG) in the
CPU for primary data processing. There is a supply voltage control circuit to adjust
the 12 lead ECG sensitivity. The NIBP cuff size (adult/child or neonate) sensor
(hall element) is provided on this board. The status signal from the sensor goes to
the gate array on this board and is transferred to the DPU board through the
motherboard.
4 MHz
CPU
125 µs int
Gate array
1 kHz reference clock
for resolution control
Control reset signal
12 lead ECG
(I, II, V1 to V6)
Multiplexer control
signal
DC level flag
Gain control signal
1 MHz
EEPROM
128 x 8
Transmission data for
DPU board
PWM control signal
500 Hz (8 ch)
Pacing pulse edge detection
125 kHz respiration carrier
waveform
Divider
NIBP cuff size