Detection Of Pacer Pulses; Heart Rate Indication; Signal Inputs - GE MAC 1200 Service Manual

Detection of Pacer Pulses

Heart Rate Indication

Signal Inputs

Revision D
Specifications: Basic Information

Pulse length between 0.1 and 2.5 ms
 Pacer pulse marker independent of pulse polarity
 Pulse amplitude between ±5 mV and ±700 mV
Derivation of the heart rate from all ECG signals.
 Display range between 30 and 300 bpm.

Display update with every heart beat, maximum every 2 seconds.
Isolated patient signal input, IEC type CF, high-voltage protection for all lead
connections and neutral electrode, interference compensation via neutral electrode,
monitoring for open leads.
 Electrode connections for RA, LA, LL, LA, V1 to V6

Input impedance for differential signals between any two electrode connections
> 10 M at 10 Hz
 Input impedance for common-mode signals referred to neutral electrode > 50
M up to 60 Hz

Dynamic range for differential signals between any two electrode connections
for AC voltage ±10 mV, for superimposed DC voltage (polarization voltage)
±600 mV
 Dynamic range for common-mode signals referred to neutral electrode ±1 V,
referred to chassis 263 V AC (rms)

Quiescent input current via any electrode connection for 1 kW termination
referred to neutral electrode < 50 nA
 Patient leakage current (rms values) according to IEC, class CF: in normal
condition <10 A, in single-fault condition (e.g. patient in contact with line
voltage) < 20 A
 Non-destructive range for lead-electrode connections and the neutral electrode
connection referred to neutral electrode ±50 V, referred to chassis ±1500 V
 Pulse voltage resistance of all lead electrode connections and of the neutral
electrode connection referred to chassis (either polarity, e.g. defibrillation) 5000
V
 Monitoring of each electrode for open leads: RA, LA, LL, RL, V1, V2, V3, V4,
V5, V6 audio signal at printer start
MAC 1200 resting ECG analysis system
2012250-095
9-5