Signal Transmission - GE Medical Systems MAC 1200 Operator's Manual

Signal Transmission

Patient Input to Recording
13-8
Technical Specifications: Recording
After lead formation and digitization simultaneous transmission of all
electrode signals to the digital processing system; muscle filter, AC filter,
pacing pulse identification, automatic or manual sensitivity adjustment,
automatic baseline adjustment and drift compensation by means of the
anti-drift system (A.D.S.) can be enabled or disabled simultaneously for
all channels; digital output of processed signals via thermal-array
printhead.
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Low cut-off frequency (-3 db limits) 0.08 Hz, equivalent to a time
constant of 2.04 seconds.
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High cut-off frequency (3 dB limits) operating mode: Auto, Manual
150 Hz (IEC/AHA) operating mode: Arrhy 100 Hz (IEC).
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Signal sampling rate: 1000 per second
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Resolution, referred to the input 5 µV
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Output rate to recorder 2000 per second
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For all leads, gain adjustment in four steps: 40-20-10-5 mm/mV.
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With active muscle filter (low-pass characteristic) 3-dB drop of the
amplitude frequency response at approximately 40 or 20 Hz.
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With active AC line filter detection and compensation of periodic
50 Hz or 60 Hz frequency components (depending on recorder model)
attenuation >40 dB.
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Non-linear distortion below values specified in IEC and AHA
recommendations.
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Coincidence error limits between any two channels ±0,5 mm.
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Detection of pacer pulses in C2 or other C leads and marking in all
channels for signals referred to patient input.
Duration ≥ 0.1 ms, amplitude > 5 mV
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Noise in the signal transmission path below values specified in IEC
and AHA requirements: ≤ 2,5 µV rms.
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Common-mode rejection for 50 or 60-Hz signals (depending on
recorder model) with AC filter switched on >140 dB.
MAC 1200
2012250-022
Revision B