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Functional description
2.2.3 LM-ECG board
Patient signals are connected to overload protection circuits (resistors and gas-filled surge
arresters) and analog switches to instrumentation amplifiers. Then the signals are amplified by 480
and limited by slew rate. Then they are A/D-converted, analyzed and transferred to module bus in
digital form.
SLEW-
RATE
DETECTOR
SLEW-
RATE
DETECTOR
SLEW-
RATE
DETECTOR
ANTI-
ALIAS
ANTI-
ALIAS
ANTI-
ALIAS
A/D
MICRO-
PROCESSOR
(uP)
OPTO-
COUPLERS
POWER
SOURCE
OPTO-
COUPLERS
POWER
SOURCE
PATIENT
OVERLOAD PROTECTION
ANALOG SWITCHES
LM-MODULE BUS
ISOLATION
uP
uP
uP
SUPPLY
VOLTAGES
HP
Filter
uP
HP
Filter
uP
HP
Filter
uP
SLEW-
RATE
DETECTOR
ANTI-
ALIAS
uP
HP
Filter
uP
R
L
F
C
N
LEAD SELECTION LOGIC
Controlled by ECG lead
selection signals from uP
Resp
amplifier
Sync. Rectifier
Amplifier
DEFIBRILLA-
TION
DETECTOR
uP
31 kHz
from uP
OPTO-
COUPLER
OPTO-
COUPLER
Sync. signal
Reset
Feedback
Figure 4
LM-ECG measurement block diagram
Analog ECG section
ECG cable is connected to patient connector pins 1 to 5 (ECG signals) on the input board which
contains an overload protection circuit.
Leads are connected to amplifiers via analog switches. The state of the switches depends on the
cable type.
Document No. 8000060-1
11
Summary of Contents for F-LM1
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