GE marquette MAC 1100, Servicing Instructions

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Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page
67
227 492 20 D - 0002
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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
µ
V 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