Marquette Hellige GmbH MicroSmart V 2.xx Page 62
Servicing Instructions 227 470 35 B - 97.12
* 3-dB drop of the amplitude frequency response with activated muscle filter (low pass
characteristics) at approx. 35 Hz or 20 Hz
* with activated automatic line filter, detection and compensation of cyclical 50- or 60-Hz-
frequency contents (configurable): attenuation > 40 dB
* non-linear distortion better than IEC- and AHA recommendations
* coincidence error limits between any channels ±0,5 mm
* detection of Pace pulses in C2 or other C-electrode and marking in all channels of signals
with reference to the patient input:
duration > 0.1 ms, amplitude > 5 mV
* noise in signal transmission path less than required in IEC- and AHA recommendations:
< 2,5 µV rms
* common-mode rejection for signals with 50 or 60 Hz (depending on design of unit) with
activated line frequency compensation > 140 dB
Calibrating the ECG
Automatic recording of a defined voltage jump, applicable to all channels.
* calibration voltage, with reference to the ECG signal input: 1 mV. Pulse width
independent of paper speed approx. 200ms
Zero position
Automatic setting into the best possible operating range, as factor of the signal amplitude.
Anti-drift system (ADS)
Automatic compensation of zero line fluctuations caused by fluctuations in the polarization
voltage at the pickup electrodes.
Blocking
Automatic rapid charge shift of the coupling capacitors in the pre-amplifiers after applying the
electrodes.
Electrode control
Acoustic or visual signal message after electrode failure off or open circuit in LCD display
panel. Individual electrode monitoring.
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