GE Eagle 1000, Servicing Instructions

Page: 39 / 148

GE Medical Systems EAGLE 1000
Page 39
Information Technologies
Servicing Instructions 227 468 01 Rev. G
Heart rate monitoring
A QRS detector in the ECG circuit detects the beats. This detector filters and triggers the
signal components typical of QRS from the channel 1 ECG signals when their amplitude is
greater than a threshold value arising in the prior amplitudes.
The processor receives a signal for every beat detected by the ECG circuit, calculates the
heart rate from these and triggers an alarm when the heart rate is outside the programmed
limits.
Pacing detection
Signal segments with a steep rising or falling edge are suppressed as long as their ampli-
tude exceeds a value of 6 mV. This suppression is limited to a time period of about 50 ms.
During this period the baseline is recorded and a pacing-pulse message is passed on to
the processor, which puts a marker for this event on the display.