Marquette Hellige GmbH MicroSmart V 2.xx Page 61
Servicing Instructions 227 470 35 B - 97.12
* Operating range for differential signals between any electrode connections at alternating
voltage ±10 mV, for superimposed direct voltage (polarization voltage) ±600 mV
* Operating range for common-mode signals against N ±1 V, against ground (chassis)
effective alternating voltage 263 V
* Input bias current over any electrode connection for termination with 1 kOhm after N <
50 nA
* Patient lead current (effective) in compliance with IEC Class CF: under standard
conditions < 10 µA, at first error if patient is on line voltage < 20 µA
* Limits for continuous load of the pickup electrode connections and of the N-terminal
against N ±50 V; against ground (chassis) ±1500 V
* Pulse voltage strength of all pickup electrode connections and of the N-terminal against
ground in any polarity (e.g. defibrillation) 5000 V
* Electrode break monitoring for individual electrodes: R, L, F, N, C1,C2, C3, C4, C5, C6,
acoustic break signal upon start of program.
Data interface
An infrared interface for data exchange with adapted auxiliary appliances.
(MicroSmart MC only).
* Transmission rate: 9600 Baud
* Data bits: 8
* Stop bits: 1
* Parity: no
* no hardware handshake
* half duplex
* Range max. 3 meters (direct visual connection to receiver)
Patient input for recording:
Simultaneous transfer of all electrode signals after lead formation and digital conversion in
digital processing system; common muscle filter and mains frequency compensation for all leads,
Pace detection, automatic or manual sensitivity control, automatic tic zero line positioning, drift
compensation via anti-drift system (A.D.S.), digital output of the conditioned signals via thermal
array recorder.
* lower cutoff frequency (-3 dB-limit) 0.04Hz or 0.08Hz or 0.16Hz (configurable)
corresponding to a time constant of 4 s or 2 s or 1 s
* upper cutoff frequency (-3 dB-limits) 150 Hz (IEC/AHA)
* signal scanning frequency: 1000/s
* resolution, with reference to input 5 µV
* output rate for recording 1000/s
* sensitivity adjustable jointly for all leads in 3 steps 20–10–5 mm/mV
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