GE MAC 1200 Service Manual

Revision D MAC 1200 resting ECG analysis system 2-9
2012250-095
Functional Description: PCB Control CS_CI
ECG Recording and Front-End Processing
The patient input is classified as being cardiac floating and is defibrillation-proof.
The patient leads are connected with a 15-pin connector with a special form for the
specified and released patient cables for the MAC 1200 resting ECG analysis
system.
The main element of the ECG recording and front-end processing is a set of chips
comprising 3 ASICs. Pace detection is realized by a separate circuit.
Every disconnected electrode is detected by a special AC measurement, which
allows higher impedance between electrode and patient.
N common-mode compensation ensures suppression of interference, at the same
time serving to improve the in-phase suppression of the input electrodes.
To protect patients, the ECG recording and front-end processing are assembled as
floating components. Digital signals from and to the controller core are transmitted
via opto-electronic couplers. The floating supply ±5 V is generated by an isolated
flyback converter from the +5 V logic power supply.

GE MAC 1200 Specifications

General

ECG Channels	12
Display	LCD
Power Supply	AC or battery
Frequency Response	0.05 to 150 Hz
Memory	Internal storage for ECG data
Device Type	ECG
Printing	Thermal
Filters	AC filter
Connectivity	RS-232, USB
Sampling Rate	1000 samples per second per channel