Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page 67
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• with active muscle filter (low-pass characteristic) 3-dB drop of the amplitude frequency
response at approx. 40 or 20 Hz
• with active AC line filter detection and compensation of periodic 50 or 60 Hz frequency
components (depending on recorder model) attenuation >40 dB
• non-linear distortion below values specified in IEC and AHA recommendations
• coincidence error limits between any two channels ±0.5 mm
• detection of pacer pulses in V2 or other V leads and marking in all channels for signals
referred to patient input:
duration ≥ 0.1 ms, amplitude > 5 mV
• noise in the signal transmission path below values specified in IEC and AHA
requirements: ≤ 2.5 µV rms
• common-mode rejection for 50 or 60-Hz signals (depending on recorder model) with AC
filter switched on >140 dB
ECG calibration
automatic recording of a defined voltage step, valid for all channels
• calibration voltage, referred to ECG signal input: l mV
calibration pulse width on recording depends on paper speed
25 mm/s: 5 mm
50 mm/s: 10 mm
5 mm/s: 1 mm
Automatic ECG gain adjustment
The gain automatically adapts to the incoming signal. The maximum amplitude of the lead
group or of all leads determines the gain setting.
• automatic adjustment range 5 to 40 mm/mV
• amplitude range (6 channels) 18 to 31 mm
Baseline
automatic adjustment of the baseline to the optimal recording range, in dependence of the
signal amplitude
Anti-drift system (ADS) (cubic spline)
automatic compensation of baseline fluctuations caused by polarization voltage fluctuations
at the lead electrodes (delay in recording: 4.2 s)
ECG storage
in 12 Lead Mode, storage of up to 40 ECGs
• stored ECGs can be deleted (individually or all in one pass), printed, transferred, and
patient data can be edited
• when memory is full user is informed of the possible actions
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