Specifications

IQmark Digital ECG Operation Manual
49
10- Leadwire
Patient Cable
with Defib
Protection
ECG Buffer
Amplifiers
Instrumentation
Amplifiers
Lead Off Detector
Filters and Gain
amplifiers
8-Channel A/D
Converter
Microcontroller
Isolated Serial
Interface
Pacemaker
Detector
DC-DC Power
Circuit
Patient
PC System
Figure 5-1 System Block Diagram
10-Leadwire Patient Cable
The IQmark Digital ECG uses the special Midmark 10-Leadwire patient cable for its 12-
lead ECG data acquisition. The patient cable has 10 conductor shielded lead wires. There
is a 1Kohm ( 10%) resistor embedded inside each lead wire. Together with the voltage
clamping circuit built into the ECG front end, the IQmark Digital ECG provides the built-
in defibrillation protection capability required by AAMI EC-11 and IEC-60601.
ECG Buffer Amplifiers
The patient ECG signals are first fed to the 8 ECG buffer amplifiers. These buffer
amplifiers provide high input resistance for the patient interface with low output
resistance to the instrumentation amplifiers.
Instrumentation Amplifiers
There are eight differential instrumentation amplifiers used in the IQmark Digital ECG,
providing eight output signals from CH0 to CH7. Each differential amplifier has two
inputs, one positive and one negative.
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